Publications
| Title | Abstract | Year Filter | PMID(sorted descending) Filter |
|---|
| the effect of nitrate-nitrogen supply on bacteria and bacterial-feeding fauna in the rhizosphere of different grass species. | microbial growth in the rhizosphere is affected by the release of organic material from roots, so differences in carbon budgets between plants may affect their rhizosphere biology. this was tested by sampling populations of bacteria and bacteriophagous fauna from the rhizosphere of lolium perenne, festuca arundinacea, poa annua, and poa pratensis, under conditions of high and low nitrate availability. concentrations of soluble phenolics and lignin varied considerably between the species but were ... | 1992 | 28313466 |
| microsite utilization by bromus tectorum l. and poa pratensis l. in a meadow steppe community. | emergence of bromus tectorum l. and poa pratensis l., two dominant alien grasses in eastern washington, from 24 microsites was monitored in spring and autumn 1979. spring emergence of b. tectorum reached a maximum on north-facing slopes of artificially constructed pocket gopher mounds and burrows while spring emergence of p. pratensis was maximized on both north-and southfacing slopes of mounds. earliest autumn emergence of b. tectorum seedlings was in fissures of 0.5 cm, 1 cm, and 2 cm depth wh ... | 1983 | 28310225 |
| competition between bromus tectorum l. and poa pratensis l.: the role of light. | bromus tectorum l. dominates sites of large-scale disturbance, while poa pratensis l. dominates the sites of small-scale disturbance in the festuca/symphoricarpos habitat type in eastern washington (usa). the role of incident irradiation in influencing these distributions was examined using field and glasshouse experiments. glasshouse grown swards of b. tectorum growing beneath an established canopy of p. pratensis displayed larger biomass and higher survival when exposed to supplemental light v ... | 1983 | 28309370 |
| differential cadmium distribution and translocation in roots and shoots related to hyper-tolerance between tall fescue and kentucky bluegrass. | phytoremediation efficiency mainly depends upon mechanisms in the uptake and translocation of soil contaminants. cadmium (cd) distribution and translocation in roots and shoots of tall fescue (festuca arundinacea) and kentucky bluegrass (poa pratensis) were observed using fluorescence spectroscopy with a laser confocal scanning microscope. no difference in root cd accumulations was detected between these two turfgrass species. kentucky bluegrass transported more cd into the stele for root-to-sho ... | 2017 | 28217136 |
| biomass production in a tallgrass prairie ecosystem exposed to ambient and elevated co"2. | responses to elevated co"2 have not been measured for natural grassland ecosystems. global carbon budgets will likely be affected by changes in biomass production and allocation in the major terrestrial ecosystems. whether ecosystems sequester or release excess carbon to the atmosphere will partly determine the extent and rate that atmospheric co"2 concentration rises. elevated co"2 also may change plant community species composition and water status. we determined above- and belowground biomass ... | 1993 | 27759286 |
| herbivory by canada geese: diet selection and effect on lawns. | flocks of free-ranging canada geese (branta canadensis) often are considered nuisances when they graze on lawns because they litter the sites with fecal material, and their grazing often is perceived to be detrimental to the turf. i tested whether goose grazing had changed the composition of grass species at 20 sites in connecticut where geese were considered nuisances. at these sites kentucky bluegrass (poa pratensis) was less prevalent in areas grazed heavily by geese than in areas of the same ... | 1991 | 27755658 |
| gibberellin-stimulation of rhizome elongation and differential ga-responsive proteomic changes in two grass species. | rapid and extensive rhizome development is a desirable trait for perennial grass growth and adaptation to environmental stresses. the objective of this study was to determine proteomic changes and associated metabolic pathways of gibberellin (ga) -regulation of rhizome elongation in two perennial grass species differing in rhizome development. plants of a short-rhizome bunch-type tall fescue (tf; festuca arundinacea; 'br') and an extensive rhizomatous kentucky bluegrass (kb; poa pratensis; 'baro ... | 2016 | 27446135 |
| the grass pollen season 2014 in vienna: a pilot study combining phenology, aerobiology and symptom data. | grasses (poaceae) are one of the largest plant families and are distributed worldwide. grass pollen allergy is one of the most important pollen allergies affecting large parts of the population worldwide. the grass pollen season itself is special since it is caused by the flowering of various grass species that present unique profiles of allergenicity, which assumingly plays a significant role and impact on grass pollen sensitization profiles for the allergy sufferer. the aim of this study, cond ... | 2016 | 27317132 |
| factors influencing the distribution and activity of dermacentor reticulatus (f.) ticks in an anthropopressure-unaffected area in central-eastern poland. | despite the increasing prevalence and significant role of d. reticulatus in pathogen transmission, the factors influencing its distribution and activity are still poorly known. the paper presents for the first time a study of the d. reticulatus ecology in a protected area, in which the dependence of d. reticulatus occurrence and activity on the ecological habitat type is analysed. | 2016 | 27294631 |
| an evaluation of the use of individual grass species in retaining polluted soil and dust particulates in vegetated sustainable drainage devices. | a sustainable means of preventing polluted particulates carried in urban storm water entering rivers, groundwater and lakes is by employing vegetated sustainable drainage system (suds) devices, or best management practices to trap or biodegrade them. in the uk, a mixture of grass species is recommended for use in devices such as swales or filter strips. however, there is little evidence in support of the efficiency of the individual grasses or mixtures to deal with such contaminated material. a ... | 2016 | 26753553 |
| ppcbf3 from cold-tolerant kentucky bluegrass involved in freezing tolerance associated with up-regulation of cold-related genes in transgenic arabidopsis thaliana. | dehydration-responsive element binding proteins (dreb)/c-repeat (crt) binding factors (cbf) have been identified as transcriptional activators during plant responses to cold stress. the objective of this study was to determine the physiological roles of a cbf gene isolated from a cold-tolerant perennial grass species, kentucky bluegrass (poa pratensis l.), which designated as ppcbf3, in regulating plant tolerance to freezing stress. transient transformation of arabidopsis thaliana mesophyll prot ... | 2015 | 26177510 |
| [effects of sewage sludge compost on the growth and photosynthetic characteristics of turfgrass]. | the effects of different dosages (0, 0.8%, 2%, 6% and 10%) of sewage sludge compost on the growth and photosynthetic characteristics of three turfgrass, i. e., festuca arundinacea, lolium perenne and poa pratensis were studied. the results showed that the dosage of 6% had the optimal effects. the plant height, leaf area and dry biomass of three turfgrass increased significantly with the increasing sewage sludge compost dosage, while the root/shoot ratio decreased obviously. compared with the con ... | 2014 | 25757308 |
| enrichment of aliphatic, alicyclic and aromatic acids by oil-degrading bacteria isolated from the rhizosphere of plants growing in oil-contaminated soil from kazakhstan. | three microbial strains were isolated from the rhizosphere of alfalfa (medicago sativa), grass mixture (festuca rubra, 75 %; lolium perenne, 20 %; poa pratensis, 10 %), and rape (brassica napus) on the basis of their high capacity to use crude oil as the sole carbon and energy source. these isolates used an unusually wide spectrum of hydrocarbons as substrates (more than 80), including n-alkanes with chain lengths ranging from c12 to c32, monomethyl- and monoethyl-substituted alkanes (c12-c23), ... | 2015 | 25592733 |
| transgenic tobacco plants overexpressing a grass ppexp1 gene exhibit enhanced tolerance to heat stress. | heat stress is a detrimental abiotic stress limiting the growth of many plant species and is associated with various cellular and physiological damages. expansins are a family of proteins which are known to play roles in regulating cell wall elongation and expansion, as well as other growth and developmental processes. the in vitro roles of expansins regulating plant heat tolerance are not well understood. the objectives of this study were to isolate and clone an expansin gene in a perennial gra ... | 2014 | 25003197 |
| sublingual or subcutaneous immunotherapy for seasonal allergic rhinitis: an indirect analysis of efficacy, safety and cost. | the standard of preventive care for poorly controlled seasonal allergic rhinitis (ar) is subcutaneous immunotherapy (scit) with allergen extracts, administered in a physician's office. as an alternative to scit, sublingual immunotherapy (slit) is now an option for patients with seasonal ar. oralair, a slit tablet containing freeze-dried allergen extracts of five grasses [cocksfoot (dactylis glomerata), meadow grass (poa pratensis), rye grass (lolium perenne), sweet vernal grass (anthoxanthum odo ... | 2014 | 24444390 |
| asymmetric small-scale distribution and allelopathy: interaction betweenrumex obtusifolius l. and meadow species. | analysis of small-scale distribution may allow allelopathic interaction among plant species to be distinguished from competitive interaction. if all environmental factors except slope are uniform, allelopathy produces spatial asymmetry in the association with a hypothetical receptor species and the corresponding hypothetical emitter species in the neighborhood of the latter. the interaction betweenrumex obtusifolius and the meadow specieslolium perenne, poa pratensis, dactylis glomerata, andtrif ... | 1988 | 24276533 |
| are weeds hitchhiking a ride on your car? a systematic review of seed dispersal on cars. | when traveling in cars, we can unintentionally carry and disperse weed seed; but which species, and where are they a problem? to answer these questions, we systematically searched the scientific literature to identify all original research studies that assess seed transported by cars and listed the species with seed on/in cars. from the 13 studies that fit these criteria, we found 626 species from 75 families that have seed that can be dispersed by cars. of these, 599 are listed as weeds in some ... | 2013 | 24265803 |
| the root herbivore history of the soil affects the productivity of a grassland plant community and determines plant response to new root herbivore attack. | insect root herbivores can alter plant community structure by affecting the competitive ability of single plants. however, their effects can be modified by the soil environment. root herbivory itself may induce changes in the soil biota community, and it has recently been shown that these changes can affect plant growth in a subsequent season or plant generation. however, so far it is not known whether these root herbivore history effects (i) are detectable at the plant community level and/or (i ... | 2013 | 23441201 |
| the skin prick test - european standards. | skin prick testing is an essential test procedure to confirm sensitization in ige-mediated allergic disease in subjects with rhinoconjunctivitis, asthma, urticaria, anapylaxis, atopic eczema and food and drug allergy. this manuscript reviews the available evidence including medline and embase searches, abstracts of international allergy meetings and position papers from the world allergy literature. the recommended method of prick testing includes the appropriate use of specific allergen extract ... | 2013 | 23369181 |
| effect of silage botanical composition on ruminal biohydrogenation and transfer of fatty acids to milk in dairy cows. | ruminal biohydrogenation and transfer of fatty acids (fa) to milk were determined for 4 silages with different botanical compositions using 4 multiparous norwegian red dairy cows [(mean ± sd) 118 ± 40.9 d in milk, 22.5 ± 2.72 kg of milk/d, 631 ± 3.3 kg of body weight, 3.3 ± 0.40 points on body condition score at the start of the experiment] fitted with rumen cannulas. treatments consisted of 4 experimental silages: a mix of the first and third cut of organically managed short-term grassland with ... | 2013 | 23200474 |
| new formulation of paraquat with lysine acetylsalicylate with low mammalian toxicity and effective herbicidal activity. | currently, the commercial formulations of the herbicide paraquat are highly toxic to humans, and no effective antidote is available for paraquat poisoning. the aim of the present study was to develop a safe formulation, combining paraquat and the known antidote lysine acetylsalicylate. the toxicity of a mixture of gramoxone® (20% paraquat) and lysine acetylsalicylate in adult wistar male rats and the herbicidal efficacy against grass lawn (50% of poa pratensis and 50% of festuca arundinacea) wer ... | 2013 | 23109273 |
| simulated warming differentially affects the growth and competitive ability of centaurea maculosa populations from home and introduced ranges. | climate warming may drive invasions by exotic plants, thereby raising concerns over the risks of invasive plants. however, little is known about how climate warming influences the growth and competitive ability of exotic plants from their home and introduced ranges. we conducted a common garden experiment with an invasive plant centaurea maculosa and a native plant poa pratensis, in which a mixture of sand and vermiculite was used as a neutral medium, and contrasted the total biomass, competitiv ... | 2012 | 22303485 |
| Composition and hydrothermal pretreatment and enzymatic saccharification performance of grasses and legumes from a mixed-species prairie. | ABSTRACT: | 2011 | 22085451 |
| Glycoproteins are species-specific markers and major IgE reactants in grass pollens. | Grass pollen allergic patients are concomitantly exposed and sensitized to pollens from multiple Pooideae (i.e. common grass) species. As such, they are currently desensitized by allergen-specific immunotherapy using extracts made from mixes of pollens from Anthoxanthum odoratum, Dactylis glomerata, Lolium perenne, Phleum pratense and Poa pratensis. Herein, we demonstrate that species-specific glycoprotein patterns are documented by 1D and 2D electrophoresis and Western blotting analysis, which ... | 2011 | 21951299 |
| effects of mycorrhizae on plant growth and dynamics in experimental tall grass prairie microcosms. | experimental microcosms (40 x 52 x 32 cm) containing an assemblage of eight tallgrass prairie grass and forb species in native prairie soil were maintained under mycorrhizal (untreated control) or mycorrhizal-suppressed (fungicide-treated) conditions to examine plant growth, demographic, and community responses to mycorrhizal symbiosis. the fungicide benomyl successfully reduced mycorrhizal root colonization in the fungicide-treated microcosms to only 6.4% (an 83% reduction relative to mycorrhiz ... | 1997 | 21708601 |
| within-population genetic diversity of taraxacum officinale (asteraceae): differential genotype response and effect on interspecific competition. | clonal offspring of five morphologically distinct individuals of taraxacum officinale were planted in a greenhouse experiment with each of three competitors, plantago major, poa pratensis and trifolium pratense. the competitors were chosen to represent a series of competitive environments experienced by a natural population of t. officinale through the year. differences in size, morphology, and response to the competitive environments were found among clones and support classification of the fiv ... | 1998 | 21684978 |
| persistence of seed bank under thick volcanic deposits twenty years after eruptions of mount usu, hokkaido island, japan. | the topsoil that contained the seed bank became buried under thick tephra after the eruptions of mount usu during 1977 and 1978. to determine the seed bank potential of the topsoil 20 yr after the eruptions, i.e., in 1998, 408 100-cm(3) samples were excavated under 115-185 cm of volcanic deposits. the topsoil was collected at 10-cm intervals along the horizontal scale and was divided into a 0-5 cm deep upper layer and a 5-10 cm deep lower layer. the seed bank was estimated by both the germinatio ... | 2001 | 21669614 |
| a new epichloe species with interspecific hybrid origins from poa pratensis ssp. pratensis in liyang, china. | we describe a new epichloë species found in symbiosis with poa pratensis ssp. pratensis in liyang, china. stromata characteristic of epichloë spp. were present on some of the reproductive tillers of individual host grasses. only 3 of the 98 stromata observed on field plants became orange and produced perithecia. phylogenetic analyses based on sequences of tubb and tefa indicated that this epichloë sp. was an interspecific hybrid related to both e. yangzii and members in the e. typhina complex ... | 2011 | 21659456 |
| protein supplementation of ruminants consuming low-quality cool- or warm-season forage: differences in intake and digestibility. | an in situ study (exp. 1) using 4 ruminally cannulated steers (343 ± 11 kg bw) in a completely randomized design was used to compare ruminal degradation characteristics of low-quality cool-season (c3; kentucky bluegrass straw; poa pratensis; 6.3% cp; dm basis) and warm-season (c4; tallgrass prairie; 5.7% cp; dm basis) forage. four ruminally cannulated steers (252 ± 8 kg bw; exp. 2) and 4 wethers (38 ± 1 kg bw; exp. 3) were used in two, 2 × 2 factorial design experiments to determine the influenc ... | 2011 | 21622884 |
| forage as a primary source of mycotoxins in animal diets. | the issue of moulds and, thus, contamination with mycotoxins is very topical, particularly in connexion with forages from grass stands used at the end of the growing season. deoxynivalenol (don), zearalenone (zea), fumonisins (fum) and aflatoxins (afl) are among the most common mycotoxins. the aim of the paper was to determine concentrations of mycotoxins in selected grasses (lolium perenne, festulolium pabulare, festulolium braunii) and their mixtures with festuca rubra an/or poa pratensis duri ... | 2010 | 21318013 |
| effect of amendments on phytoavailability and fractionation of copper and zinc in a contaminated soil. | the ability of amendments to modify the soil properties and influence plants to immobilise cu and zn was studied in a naturally contaminated, additionally spiked podzolic soil. lolium perenne l (perennial rye grass), festuca rubra l (creeping red fescue) and poa pratensis l (kentucky blue grass) were tested in a pot study in the presence of soil amendments (lime, phosphate, and compost, individually and in combination) to assess the effect of soil-plant-amendment interaction on phytostabilisatio ... | 2010 | 21166277 |
| the evolutionary origins of three new neotyphodium endophyte species from grasses indigenous to the southern hemisphere. | members of the genus neotyphodium are asexual, seedborne, protective fungal endophytes of cool season grasses that have likely evolved either directly from sexual epichloë; species, or by the interspecific hybridization of distinct lineages of epichloë; and neotyphodium. we investigated the evolutionary origins of neotyphodium endophytes from several grasses that are indigenous to the southern hemisphere using a multiple-gene phylogenetic approach. intron regions of the genes encoding β-tubulin ... | 2002 | 21156542 |
| differential metabolic responses of perennial grass cynodon transvaalensis×cynodon dactylon (c₄) and poa pratensis (c₃) to heat stress. | differential metabolic responses to heat stress may be associated with variations in heat tolerance between cool-season (c₃) and warm-season (c₄) perennial grass species. the main objective of this study was to identify metabolites associated with differential heat tolerance between c₄ bermudagrass and c₃ kentucky bluegrass by performing metabolite profile analysis using gas chromatography-mass spectrometry. plants of kentucky bluegrass (poa pratensis'midnight') and hybrid bermudagrass (cynodon ... | 2010 | 21114672 |
| prevalence of an intraspecific neotyphodium hybrid in natural populations of stout wood reed (cinna arundinacea l.) from eastern north america. | members of genus neotyphodium are asexual derivatives of sexual epichloë species and maintain endophytic relationships with many cool-season grasses. most neotyphodium species analyzed so far are interspecific hybrids with combined or partial genomes of two or three ancestral species. in this study we characterized neotyphodium isolates from cinna arundinacea, a perennial cool-season grass from eastern north america. a total of 23 isolates grouping into two distinct morphotypes were obtained fro ... | 2010 | 20943524 |
| fructan accumulation and transcription of candidate genes during cold acclimation in three varieties of poa pratensis. | poa pratensis, a type species for the grass family (poaceae), is an important cool season grass that accumulates fructans as a polysaccharide reserve. we studied fructan contents and expression of candidate fructan metabolism genes during cold acclimation in three varieties of p. pratensis adapted to different environments: northern norway, denmark, and the netherlands. fructan content increased significantly during cold acclimation and varieties showed significant differences in the level of fr ... | 2010 | 20880605 |
| [runoff and sediment processes and anti-erosion effects of grass-covered earth road in loess hilly region]. | a laboratory simulation test with slope-adjustable steel tank and artificial rainfall was conducted to study the runoff and sediment processes of uncovered and poa pratensis l.-planted earth roads, and the anti-erosion effects of p. pratensis-planted earth road. at the same rainfall intensity and slope, the runoff coefficient of p. pratensis-planted earth road was larger than that of uncovered earth road. for the two kinds of earth roads, their runoff coefficients all increased with increasing r ... | 2010 | 20879538 |
| restoration of foothills rough fescue grassland following pipeline disturbance in southwestern alberta. | the effects of pipeline construction and reclamation techniques on the restoration of rough fescue plant communities following pipeline construction in southwestern alberta, canada were evaluated after 7-40 years. the pipeline construction right-of-way (row) sites varied from no recovery of rough fescue grassland to moderate recovery. the row sites had a higher proportion of introduced grasses and forbs, less topsoil, and poorer rangeland health than the adjacent undisturbed grassland. within th ... | 2010 | 20801578 |
| herbivore and fungal pathogen exclusion affects the seed production of four common grassland species. | insect herbivores and fungal pathogens can independently affect plant fitness, and may have interactive effects. however, few studies have experimentally quantified the joint effects of insects and fungal pathogens on seed production in non-agricultural populations. we examined the factorial effects of insect herbivore exclusion (via insecticide) and fungal pathogen exclusion (via fungicide) on the population-level seed production of four common graminoid species (andropogon gerardii, schizachyr ... | 2010 | 20711408 |
| which allergen extract for grass pollen immunotherapy? an in vitro study. | grass pollen is a major cause of allergy throughout the world. the only treatment targeting the causes and not only the symptoms of allergy is specific immunotherapy (it). a number of controlled trials demonstrated the efficacy of it in grass pollen allergic subjects, most using extracts of multiple grasses but some using extracts of a single grass. the optimal grass extract for it has not yet been established. | 2010 | 20653430 |
| century-old mystery of puccinia striiformis life history solved with the identification of berberis as an alternate host. | the life history of puccinia striiformis remains a mystery because the alternate host has never been identified. inoculation of grasses using aeciospores from naturally infected berberis chinensis and b. koreana resulted in infection on poa pratensis, producing uredinia typical of stripe rust caused by p. striiformis. analyses using real-time polymerase chain reaction and dna sequence confirmed the rust fungus as p. striiformis. pycnia and aecia were produced on b. chinensis, b. holstii, b. kore ... | 2010 | 20373963 |
| the use of digital photos to assess visual cover for wildlife in rangelands. | grassland vegetation can provide visual cover for terrestrial vertebrates. the most commonly used method to assess visual cover is the robel pole. we test the use of digital photography as a more accurate and repeatable method. we assessed the digital photography method on four forage grassland species (pseudoroegneria spicata, festuca campestris, poa pratensis, achnatherum richardsonii). digital photos of 2-dimensional cutout silhouettes of three bird species sharp-tailed grouse, western meadow ... | 2010 | 20226585 |
| phytoavailability and fractionation of lead and manganese in a contaminated soil after application of three amendments. | studies were conducted to determine the best management practice for immobilisation of toxic pb and mn in soil and the interaction of these metal contaminants with the associated plants. the research protocol comprises addition of soil amendments to accelerate physico-chemically driven sorption processes and growth of appropriate plant species to reduce physiologically driven uptake of pb and mn. lolium perenne l (perennial rye grass), festuca rubra l (creeping red fescue) and poa pratensis l (k ... | 2010 | 20219365 |
| diffusion limitations and metabolic factors associated with inhibition and recovery of photosynthesis from drought stress in a c perennial grass species. | stomatal closure and metabolic impairment under drought stress limits photosynthesis. the objective of this study was to determine major stomatal and metabolic factors involved in photosynthetic responses to drought and recovery upon re-watering in a c(3) perennial grass species, kentucky bluegrass (poa pratensis l.). two genotypes differing in drought resistance, 'midnight' (tolerant) and 'brilliant' (sensitive), were subjected to drought stress for 15 days and then re-watered for 10 days in gr ... | 2010 | 20070869 |
| phosphorus runoff from turfgrass as affected by phosphorus fertilization and clipping management. | phosphorus enrichment of surface water is a concern in many urban watersheds. a 3-yr study on a silt loam soil with 5% slope and high soil test p (27 mg kg(-1) bray p1) was conducted to evaluate p fertilization and clipping management effects on p runoff from turfgrass (poa pratensis l.) under frozen and nonfrozen conditions. four fertilizer treatments were compared: (i) no fertilizer, (ii) nitrogen (n)+potassium (k)+0xp, (iii) n+k+1xp, and (iv) n+k+3xp. phosphorus rates were 21.3 and 63.9 kg ha ... | 2010 | 20048316 |
| in vitro cross-reactivity between tomato and other plant allergens. | cross-reactivity among fruits and different pollen and fruit species has been extensively reported. | 2009 | 19927542 |
| effects of genotype identity and diversity on the invasiveness and invasibility of plant populations. | genetic diversity within species is a potentially important, but poorly studied, determinant of plant community dynamics. here we report experiments testing the influence of genotype identity and genotypic diversity both on the invasibility of a foundation, matrix-forming species (kentucky bluegrass, poa pratensis), and on the invasiveness of a colonizing species (dandelion, taraxacum officinale). genotypes of kentucky bluegrass in monoculture showed significant variation in productivity and res ... | 2010 | 19865832 |
| phytoremediation of metal-contaminated soil in temperate humid regions of british columbia, canada. | the suitability of five plant species was studied for phytoextraction and phytostabilisation in a region with temperate maritime climate of coastal british columbia, canada. pot experiments were conducted using lolium perenne l (perennial rye grass), festuca rubra l (creeping red fescue), helianthus annuus l (sunflower), poa pratensis l (kentucky bluegrass) and brassica napus l (rape) in soils treated with three different metal (cu, pb, mn, and zn) concentrations. the bio-metric characters of pl ... | 2009 | 19810356 |
| evaluation of molecular basis of cross reactivity between rye and bermuda grass pollen allergens. | allergenic cross reactivity between the members of the pooids (lolium perenne, phleum pratense, and poa pratensis) and chloridoids (cynodon dactylon and paspalum notatum) is well established. studies using crude extracts in the past have demonstrated limited cross reactivity between the pooids and the chloridoids suggesting separate diagnosis and therapy. however, little is known regarding the molecular basis for the limited cross reactivity observed between the 2 groups of grasses. the present ... | 2009 | 19776679 |
| brassicaceae tissues as inhibitors of nitrification in soil. | brassicaceae crops often produce an unexplained increase in plant-available soil n possibly related to bioactive compounds produced from glucosinolates present in the tissues. our objective was to determine if glucosinolate-containing tissues inhibit nitrification, thereby potentially explaining this observation. ammonium, no(2)(-), and no(3)(-) n were measured in soils amended with brassicaceae ( isatis tinctoria l., brassica napus l., brassica juncea l., and sinapis alba l.) tissues containing ... | 2009 | 19722704 |
| using a selectivity index to evaluate logarithmic spraying in grass seed crops. | grass seed crops are minor crops that cannot support the development of selective herbicides for grass weed control in grass seed crops. an option is to screen for selective herbicides with the use of logarithmic spraying technology. the aim of this paper is to assess selectivity of various herbicides in grass seed crops by using dose-response curves. | 2009 | 19655396 |
| host preference of the chinch bug, blissus occiduus. | the chinch bug, blissus occiduus barber (hemiptera: blissidae), is an important pest of buffalograss, buchloë dactyloides (nutall) engelmann and potentially other turfgrass, crop, and non-crop hosts. choice studies documented the number of b. occiduus present on selected turfgrasses, crops and weeds, and provided important insights into the host preferences of this chinch bug. grasses with the most chinch bugs present included the warm-season turfgrasses b. dactyloides , zoysiagrass, zoysia japo ... | 2006 | 19537992 |
| food and feeding preferences of himalayan gray goral (naemorhedus goral bedfordi) in pakistan and azad jammu and kashmir. | himalayan gray goral is endemic to himalayas and hindukush ranges. analysis of 15 fecal samples and field observations from different areas of pakistan and azad kashmir suggest that goral consumes foliage of a minimum of 28 plant species. trees, shrubs and grasses appear in the ratio of 1:36:63 and hence the species is a grazer, though may opt for browsing when forced. the species mainly subsists on six species of grasses (chrysopogon aucheri=17.97%, themeda anathera=13.03%, poa pratensis=11.23% ... | 2008 | 19360631 |
| mathematical modeling of allelopathy. iii. a model for curve-fitting allelochemical dose responses. | bioassay techniques are often used to study the effects of allelochemicals on plant processes, and it is generally observed that the processes are stimulated at low allelochemical concentrations and inhibited as the concentrations increase. a simple empirical model is presented to analyze this type of response. the stimulation-inhibition properties of allelochemical-dose responses can be described by the parameters in the model. the indices, p% reductions, are calculated to assess the allelochem ... | 2003 | 19330111 |
| effect of tylenchorhynchus nudus on growth of kentucky bluegrass. | the effect of tylenchorhynchus nudus on growth of kentucky bluegrass was investigated under controlled environmental conditions in both a phytotron and a greenhouse. the nematode significantly reduced weights of clippings, crowns and roots. pathogenicity was greater in sandy loam soil than in loam and was enhanced by submitting plants to nutrient and/or moisture stresses; soil nutrient level was most critical. the results suggest that t. nudus contributes significantly to summer decline of blueg ... | 1973 | 19319349 |
| effects of nematicides on nematode densities in turf in connecticut. | the plant-parasitic nematodes criconemoides lobatum, hoplolaimus tylenchiformis, and tylenchorhynchus dubius were present in the top 7.5 cm of sod consisting of numerous stolons and fibrous roots. phenamiphos and 1,2-dibromo-3-chloropropane (dbcp) controlled all three species, whereas ethoprop and oxamyl controlled h. tylenchiformis and t. dubius but not c. lobatum. benomyl and carbofuran controlled h. tylenchiformis but had poor control of c. lobatum and t. dubius. the effectiveness of carbofur ... | 1978 | 19305826 |
| description and sem observations of dolichodorus marylandicus n. sp. with a key to species of dolichodorus. | dolichodorus marylandicus n. sp. is described and illustrated from grass (zoysia japonica) in college park, maryland. specimens have also been collected from perennial bluegrass (poa pratensis) pasture at beltsville, maryland, and from pine (pinus sp.) in north carolina. this new species is related to d. heterocephalus cobb, d. similis golden, and d. aestuarius chow &taylor. females are distinct in having a longer styler and shorter body length than d. aestuarius. the excretory pore is at the le ... | 1981 | 19300733 |
| relationship between cultural factors and nematodes on merion kentucky bluegrass. | a 2-year study was conducted on merion kentucky bluegrass turf (poa pratensis) to identify potential relationships among seasonal population dynamics of nematodes, chemical applications, thatch, tillering, dollar spot caused by sclerotinia homoeocarpa, clipping weight, and other factors. numbers of tylenchorhynchus maximus determined during june were inversely related to the wet weight of grass from may. one or more monthly counts of paratylenchus hamatus, criconemella rusium, and t. maximus neg ... | 1992 | 19283225 |
| influence of irrigation and heterorhabditis bacteriophora on plant-parasitic nematodes in turf. | daily irrigated, 80% pan replacement, and nonirrigated field plots of kentucky bluegrass (poa pratensis l.) were inoculated with a mixture of steinernema carpocapsae (all strain) and heterorhabditis bacteriophora (hp-88 strain) in 1988. in 1989, daily irrigated and nonirrigated plots were inoculated with hp-88 alone. the turf and associated soil contained populations of tylenchorhynchus dubius, t. nudus, pratylenchus penetrans, paratylenchus projectus, and criconemella rustica. in irrigated plot ... | 1992 | 19283039 |
| combining winter hardiness and forage yield in white clover (trifolium repens) cultivated in northern environments. | white clover (trifolium repens) is an important component of sustainable livestock systems around the world. its exploitation for agriculture in the northern, marginal areas is, however, currently limited by the lack of cultivars that combine persistence and high production potential. the aims are to investigate whether it is feasible to create breeding material of white clover for these areas by combining winter hardiness of northerly populations with good yielding ability of more southerly cul ... | 2008 | 18772149 |
| transgenerational effects of global environmental change: long-term co(2) and nitrogen treatments influence offspring growth response to elevated co(2). | global environmental changes can have immediate impacts on plant growth, physiology, and phenology. long-term effects that are only observable after one or more generations are also likely to occur. these transgenerational effects can result either from maternal environmental effects or from evolutionary responses to novel selection pressures and are important because they may alter the ultimate ecological impact of the environmental change. here, we show that transgenerational effects of atmosp ... | 2008 | 18716799 |
| quantification of seed oil from species with varying oil content using supercritical fluid extraction. | the quantity and composition of seed oil affects seed viability and storability and hence the value of a species as a resource for nutrition and plant conservation. supercritical fluid extraction with carbon dioxide (sfe-co2) offers a rapid, environmentally friendly alternative to traditional solvent extraction. | 2008 | 18473329 |
| specific immunotherapy for common grass pollen allergies: pertinence of a five grass pollen vaccine. | patients throughout europe are concomitantly exposed to multiple pollens from distinct pooideae species. given the overlap in pollination calendars and similar grain morphology, it is not possible to identify which grass species are present in the environment from pollen counts. furthermore, neither serum ige reactivity nor skin prick testing allow the identification of which grass species are involved in patient sensitisation. due to their high level of amino acid sequence homology (e.g., >90% ... | 2008 | 18362477 |
| antigenic similarity among group 1 allergens from grasses and quantitation elisa using monoclonal antibodies to phl p 1. | group 1 allergens elicit a specific ige response in about 90% of grass pollen-allergic patients. the aim of this work was to study the antigenic similarity among group 1 allergens from different grasses and to develop a monoclonal antibody (mab)-based quantitation elisa. | 2008 | 18004069 |
| use of wastewater and compost extracts as nutrient sources for growing nursery and turfgrass species. | nutrient salts present in liquid by-products following waste treatment are lost resources if not effectively recycled, and can cause environmental problems if improperly disposed. this research compared the growth response and mineral nutrient status of two nursery and two turfgrass species, hydroponically supplied with nutritive by-product extracts derived from anaerobically digested municipal solid waste (msw) and aerobically composted organic wastes from the mushroom and msw industries. forsy ... | 2007 | 17526882 |
| identification of two novel phytosiderophores secreted by perennial grasses. | it has been suggested that some perennial grasses secrete phytosiderophores in response to iron (fe) deficiency, but the compounds have not been identified. here, we identified and characterized the phytosiderophores secreted by two perennial grasses, lolium perenne cv. tove and poa pratensis cv. baron. root exudates were collected from the roots of fe-deficient grasses and then purified with various chromatographies. the structure of the purified compounds was determined using both nuclear magn ... | 2007 | 17388893 |
| [specific features of early embryogenesis in apomictic poa pratensis l]. | we studied the early stages of embryo formation in apomictic poa partensis l. it was shown that during transition to parthenogenesis, at least at the initial stages of embryogenesis, the algorithm of development of the sexual embryo is preserved. this could be due to the system of genetic control of embryogenesis, common for amphimixis and apomixis. we described asynchrony of developmental processes both within the efflorescence (asynchronous maturation of ovules) and within the ovule and even g ... | 2007 | 17352289 |
| prairie and turf buffer strips for controlling runoff from paved surfaces. | eutrophication of surface waters due to nonpoint source pollution from urban environments has raised awareness of the need to decrease runoff from roads and other impervious surfaces. these concerns have led to precautionary p application restrictions on turf and requirements for vegetative buffer strips. the impacts of two plant communities and three impervious/pervious surface ratios were assessed on runoff water quality and quantity. a mixed forb/grass prairie and a kentucky bluegrass (poa pr ... | 2007 | 17255630 |
| root penetration through sealing layers at mine deposit sites. | to prevent acid mine drainage arising from oxygen and water penetration of sulphide-rich mine tailings, the tailings are covered with layers of dry sealing material. plant roots have a great ability to penetrate dense materials, and if the roots are able to penetrate the sealing layer of a tailings deposit, its oxygen-shielding properties could be reduced. the objective of this study was to evaluate whether plant roots are able to penetrate sealing layers covering mine tailings deposits. root pe ... | 2006 | 17253002 |
| the impact of invasive grasses on the population growth of anemone patens, a long-lived native forb. | negative impacts of invasive plants on natives have been well documented, but much less is known about whether invasive plants can cause population level declines. we used demographic models to investigate the effects of two invasive grasses on the demography and population growth of anemone patens, a long-lived native perennial of north american grasslands. demographic data of a. patens growing in patches characterized by bromus inermis, poa pratensis, or native grasses were used to parameteriz ... | 2006 | 17249243 |
| breeding for disease resistance in the major cool-season turfgrasses. | over the past several decades, breeding cool-season turfgrasses for improved disease resistance has been the focus of many turfgrass breeding programs. this review article discusses the dramatic improvements made in breeding kentucky bluegrass (poa pratensis) for resistance to leaf spot (caused by drechslera poae), stem rust (caused by puccinia graminis), and stripe smut (caused by ustilago striiformis); perennial ryegrass (lolium perenne) for resistance to gray leaf spot (caused by pyricularia ... | 2006 | 17061916 |
| fire does not alter vegetation in infertile prairie. | the paradigm in prairie ecology is that fire is one of the key factors determining vegetation composition. fire can impact grassland ecosystems in various ways, including changing plant species composition and inducing nitrogen loss. i found that 17 years of different burning frequencies in infertile grassland had only a minor impact on the vegetation composition and diversity. the only major impact from increasing the frequency of fires was a decrease of poa pratensis abundance. however, other ... | 2006 | 16941181 |
| flp-mediated site-specific recombination for genome modification in turfgrass. | to develop molecular strategies for gene containment in genetically modified (gm) turfgrass, we have studied the feasibility of using the flp/frt site-specific dna recombination system from yeast for controlled genome modification in turfgrass. suspension cell cultures of creeping bentgrass (agrostis stolonifera l.) and kentucky bluegrass (poa pratensis) were co-transformed with a flp recombinase expression vector and a recombination-reporter test plasmid containing beta-glucuronidase (gusa) gen ... | 2006 | 16912917 |
| root penetration of sealing layers made of fly ash and sewage sludge. | fly ash and sewage sludge are suggested materials for constructing sealing layers covering mine tailings impoundments. little is known, however, of their effect on vegetation or resistance to root penetration. we investigate: (i) the ability of different plant species to grow in sealing layers comprising fly ash and sewage sludge, (ii) the impact on plant growth of freshly hardened fly ash compared to aged and leached ash, and (iii) the plant stress response to fly ashes of different properties. ... | 2006 | 16825445 |
| suitability of various turfgrass species and cultivars for development and survival of black cutworm (lepidoptera: noctuidae). | black cutworm, agrotis ipsilon (hufnagel) (lepidoptera: noctuidae), feeding bioassays were conducted on young and mature turfgrass species to determine their potential resistance. measures of resistance included larval weight, survival rate, instar development, pupal weight, duration of pupation, and days to pupation and adult emergence. black cutworm reared on poa pratensis 'midnight', poa arachnigera 'tejas', and poa pratensis x poa arachnigera 'reveille' exhibited slower development, lower we ... | 2006 | 16813321 |
| ethylene-induced chlorosis in the pathogenesis of bipolaris sorokiniana leaf spot of poa pratensis. | endogenous ethylene of poa pratensis leaves infected by bipolaris sorokiniana was evaluated as a factor in leaf chlorosis during pathogenesis. detectable increases in endogenous ethylene of leaves of intact plants under normal ambient pressure occurred 12 hours after inoculation and was maximum at 48 hours; from 48 to 96 hours the ethylene progressively decreased. necrotic lesions surrounded by chlorotic halos occurred on infected leaves between 24 and 48 hours. midvein chlorosis interconnecting ... | 1984 | 16663644 |
| photomorphogenically defined light and resistance of poa pratensis to drechslera sorokiniana. | photomorphogenic light definitions were derived by mathematical determination of the estimated phytochrome photoequilibrium for each light treatment spectrum. a wide range of photomorphogenic light treatments represented by spectra with estimated phytochrome photoequilibria of 0.45, 0.54, 0.60, 0.67, and 0.71 was utilized to determine the influence of photomorphogenically defined light on resistance of poa pratensis l. to pathogenesis by drechslera sorokiniana. accurate resolution of d. sorokini ... | 1980 | 16661239 |
| the requirement for sodium as a micronutrient by species having the c(4) dicarboxylic photosynthetic pathway. | six species having characteristics of plants with the c(4) dicarboxylic photosynthetic pathway, echinochloa utilis l. ohwi et yabuno (japanese millet), cynodon dactylon l. (bermuda grass), kyllinga brevifolia rottb., amaranthus tricolor l. cv. early splendour, kochia childsii hort., and portulaca grandiflora hook (rose moss), responded decisively to 0.1 milliequivalent per liter nacl supplied to their culture solutions initially containing less than 0.08 microequivalent per liter na. chlorosis a ... | 1972 | 16658050 |
| opposing actions of light in seed germination of poa pratensis and amaranthus arenicola. | action spectra were measured for suppression of germination of poa pratensis l. and amaranthus arenicola i. m. johnston seed under prolonged or continuous irradiation. the action maxima for both types of seeds are near 720 nm. the maxima are unchanged in position or magnitude in the presence of radiation in the region of 600 to 670 nm adequate to maintain phytochrome predominantly in the far-red-absorbing form. a reversible potentiation of germination to change in form of phytochrome was observe ... | 1968 | 16657003 |
| fall fertilization timing effects on nitrate leaching and turfgrass color and growth. | fall season fertilization is a widely recommended practice for turfgrass. fertilizer applied in the fall, however, may be subject to substantial leaching losses. a field study was conducted in connecticut to determine the timing effects of fall fertilization on nitrate n (no3-n) leaching, turf color, shoot density, and root mass of a 90% kentucky bluegrass (poa pratensis l.), 10% creeping red fescue (festuca rubra l.) lawn. treatments consisted of the date of fall fertilization: 15 september, 15 ... | 2006 | 16391287 |
| associative nitrogen fixation by klebsiella spp.: adhesion sites and inoculation effects on grass roots. | adhesion sites on grass roots for klebsiella strains carrying type 3 or type 1 fimbriae or both were determined. adhesion of the strains to the roots of poa pratensis and festuca rubra was highly localized; the bacteria adhered strongly to root hairs and with a markedly lower efficiency to the surface of the zone of elongation and to the root cap mucilage. no adhesion to the epidermal cells between root hairs was observed. the adhesion sites were identical for the type 3- and 1-fimbriated bacter ... | 1986 | 16347205 |
| type 1 fimbria-mediated adhesion of enteric bacteria to grass roots. | type 1 fimbriae of klebsiella pneumoniae and enterobacter agglomerans mediated bacterial adhesion to the roots of bluegrass, poa pratensis. purified, radiolabeled fimbriae bound to grass roots in vitro; binding was inhibited by alpha-methyl-d-mannoside or fab fragments to the fimbriae. anti-type 1 fimbriae fab fragments and alpha-methyl-d-mannoside also inhibited adhesion of type 1-fimbriated bacteria to p. pratensis roots. it is proposed that associative nitrogen fixation by klebsiella and ente ... | 1985 | 16346792 |
| effect of elevated tropospheric ozone on the structure of bacterial communities inhabiting the rhizosphere of herbaceous plants native to germany. | current elevated concentrations of ozone in the atmosphere, as they are observed during summer seasons, can cause severe effects on plant vegetation. this study was initiated to analyze whether ozone-stressed plants also transfer signals below ground and thereby alter the bacterial community composition in their rhizospheres. herbaceous plants, native to germany, with tolerance (anthoxanthum odoratum, achillea millefolium, poa pratensis, rumex acetosa, and veronica chamaedrys) and sensitivity (m ... | 2005 | 16332747 |
| generation of large numbers of transgenic kentucky bluegrass (poa pratensis l.) plants following biolistic gene transfer. | a very efficient transformation system, using biolistic bombardment, has been developed for the production of transgenic plants of kentucky bluegrass (poa pratensis l.). embryogenic calli, initiated from immature embryos, were transformed either with pact1ihpt-4 containing the hygromycin phosphotransferase (hpt) gene or with pdm803 containing the phosphinothricin acetyltransferase (bar) gene and the beta-glucuronidase (uida) gene. in total 119 independent transgenic plants were recovered from 15 ... | 2006 | 16328388 |
| physiological and biochemical stress responses in grassland species are influenced by both early-season ozone exposure and interspecific competition. | the effects of two-year early season ozone exposure on physiological and biochemical stress response were investigated in model plant communities. achillea millefolium and veronica chamaedrys target plants were grown in monocultures and in mixed cultures with poa pratensis (phytometer) and exposed in open-top chambers over two years for five weeks to charcoal-filtered (cf) air plus 25 nl l(-1) o3 (control) and non-filtered (nf) air plus 50 nl l(-1) o3. significant o3 effects were detected in dif ... | 2006 | 16321463 |
| growth and nutritive quality of poa pratensis as influenced by ozone and competition. | interspecific plant competition has been hypothesized to alter effects of early-season ozone (o3) stress. a phytometer-based approach was utilized to investigate o3 effects on growth and nutritive quality of poa pratensis grown in monoculture and in mixed cultures with four competitor-plant species (anthoxanthum odoratum, achillea millefolium, rumex acetosa and veronica chamaedrys). mesocosms were exposed during april/may 2000-2002 to charcoal-filtered air+25 ppb o3 (control) or non-filtered air ... | 2006 | 16290915 |
| sequence homology: a poor predictive value for profilins cross-reactivity. | profilins are highly cross-reactive allergens which bind ige antibodies of almost 20% of plant-allergic patients. this study is aimed at investigating cross-reactivity of melon profilin with other plant profilins and the role of the linear and conformational epitopes in human ige cross-reactivity. | 2005 | 16153305 |
| [genetic polymorphism of bluegrass cultivars detected by rapds]. | kentucky bluegrass (poa pratensis l.) is a hardy, persistent forage and turf grass adapted to a wide range of soils and climates. its ever-increasing adoption in highly cared-for sports fields has attracted the attention of many seed companies. however in the past, the breeding of elite varieties was often hampered by the extreme complexity of the genome. the polymorphism is important for broading the genetic basis and may be exploited for application of heterosis. the genetic relationship of 16 ... | 2005 | 16120587 |
| surface-enhanced raman spectroscopy of bacteria and pollen. | a technique for distinguishing biological material based on surface-enhanced raman scattering (sers) is reported in this work. of particular interest is biological material that can be airborne. silver colloidal particles with diameters in the range 10 to 20 nm and with a characteristic ultraviolet-visible (uv-vis) absorption band at 400 nm were used to obtain sers spectra of escherichia coli, pseudomonas aeruginosa, and salmonella typhimurium bacteria and a number of tree and grass pollens (cup ... | 2005 | 16105210 |
| effects of commercial diazinon and imidacloprid on microbial urease activity in soil and sod. | diazinon [o,o-diethyl o-2-isopropyl-6-methyl(pyrimidine-4-yl) phosphorothioate] and imidacloprid [1-(1-[6-chloro-3-pyridinyl]methyl)-n-nitro-2-imidazolidinimine] are applied to lawns for insect control simultaneously with nitrogenous fertilizers such as urea, but their potential effect on urease activity and nitrogen availability in turfgrass management has not been evaluated. urease activity in enzyme assays, washed cell assays, and soil slurries was examined as a function of insecticide concen ... | 2005 | 16091610 |
| serk and apostart. candidate genes for apomixis in poa pratensis. | seed production generally requires the mating of opposite sex gametes. apomixis, an asexual mode of reproduction, avoids both meiotic reduction and egg fertilization. the essential feature of apomixis is that an embryo is formed autonomously by parthenogenesis from an unreduced egg of an embryo sac generated through apomeiosis. if apomixis were well understood and harnessed, it could be exploited to indefinitely propagate superior hybrids or specific genotypes bearing complex gene sets. a more p ... | 2005 | 16024690 |
| comparison of early development of three grasses: lolium perenne, agrostis stolonifera and poa pratensis. | to improve the management of grass communities, early plant development was compared in three species with contrasting growth forms, a caespitose (lolium perenne), a rhizomatous (poa pratensis) and a caespitose-stoloniferous species (agrostis stolonifera). | 2005 | 15932884 |
| isolation of candidate genes for apomixis in poa pratensis l. | the essential feature of apomixis is that an embryo is formed autonomously by parthenogenesis from an unreduced egg of an embryo sac generated through apomeiosis. the genetic constitution of the offspring is, therefore, usually identical to the maternal parent, a trait of great interest to plant breeders. if apomixis were well understood and harnessed, it could be exploited to indefinitely propagate superior hybrids or specific genotypes bearing complex gene sets. a fundamental contribution to t ... | 2004 | 15821987 |
| biosolids compost amendment for reducing soil lead hazards: a pilot study of orgro amendment and grass seeding in urban yards. | in situ inactivation of soil pb is an alternative to soil removal and replacement that has been demonstrated in recent years at industrial sites with hazardous soil pb concentrations. most children exposed to elevated soil pb, however, reside in urban areas, and no government programs exist to remediate such soils unless an industrial source caused the contamination. modern regulated biosolids composts have low pb concentrations and low bioaccessible pb fractions and can improve grass growth on ... | 2005 | 15752494 |
| genome relationships in polyploid poa pratensis and other poa species inferred from phylogenetic analysis of nuclear and chloroplast dna sequences. | the genus poa comprises approximately 500 species that occur throughout the world, including the widely grown kentucky bluegrass (p. pratensis l.). hybridization and polyploidization have played a prominent role in the evolution of this complex genus, but limited information is available regarding genome relationships in poa. thus, we amplified, cloned, and compared the dna sequences of 2 nuclear genes (cdo504 and thioredoxin-like protein) and 2 chloroplast genome loci (ndhf and trnt-trnf) from ... | 2005 | 15729399 |
| [ecological strategies of soil microbial communities under plants of meadow ecosystems]. | dominant growth strategies of soil microbial communities of mown and unmown meadows were assessed with respect to the constants of saturation and maximal specific growth rate of microorganisms. the microbial community of mown-meadow soil was characterized by a greater biomass and activity due to prevalence of microorganisms with the r strategy, compared to the microbial community of unmown-meadow soil. in contrast to nonrhizosphere soil, rhizosphere soil was dominated by rapidly growing microorg ... | 2004 | 15615453 |
| the inheritance of apomixis in poa pratensis confirms a five locus model with differences in gene expressivity and penetrance. | the genetic control of apomixis was studied in numerous segregating progenies originated from intercrossing and selfing of obligate sexual and facultative apomictic parents in poa pratensis by means of the flow cytometric seed screen. the data support a novel model with five major genes required to control asexual seed formation: the apospory initiator (ait) gene, the apospory preventer (apv) gene, a megaspore development (mdv) gene, the parthenogenesis initiator (pit) gene, and the parthenogene ... | 2004 | 15608334 |
| field evaluation of cdc gravid trap attractants to primary west nile virus vectors, culex mosquitoes in new york state. | a field study was conducted to evaluate two cdc gravid trap attractants available for the west nile virus surveillance program in new york state (nys). according to potential attractiveness, a common lawn sod in nys, kentucky bluegrass (poa pratensis) infusion and a rabbit chow infusion were compared for attractiveness to primary west nile virus vectors, culex mosquitoes. attractiveness of each infusion was measured by the number of adult mosquitoes caught in cdc gravid traps and the number of e ... | 2004 | 15532922 |
| automatic milking and grazing--effects of distance to pasture and level of supplements on milk yield and cow behavior. | in an automatic milking system, 45 cows were divided into groups that grazed on a mixed grass sward (poa pratensis and festuca pratensis) at different distances from the barn: near pasture (np) at 50 m between the barn and the pasture and distant pasture (dp) at 260 m between the barn and the pasture. for both of these treatments, 3 kg of dry matter (dm) from supplementary grass silage were offered in the barn. the third treatment group grazed together under the dp treatment but was offered an a ... | 2004 | 15453482 |
| vegetation establishment on a deposit of zinc mine wastes. | field trials concerning the establishment of plant cover on a deposit of wastes from the ammeberg zinc mine in central sweden were carried out during 1976-1985. different soil conditioners and manures were applied and plant species cultivars were evaluated with regard to plant biomass, vigour, durability and content of zinc, lead and cadmium. sewage sludge and topsoil led to better establishment of grasses than did municipal waste, straw and hydraulic seeding. after 2 years, festuca rubra and po ... | 1989 | 15092483 |
| fertilizer source effect on ground and surface water quality in drainage from turfgrass. | nutrients in surface and ground water can affect human and aquatic organisms that rely on water for consumption and habitat. a mass-balance field study was conducted over two years (july 2000-may 2001) to determine the effect of nutrient source on turfgrass runoff and leachate. treatments were arranged in an incomplete randomized block design on a slope of 7 to 9% of arkport sandy loam (coarseloamy, mixed, active, mesic lamellic hapludalf) and seeded with kentucky bluegrass (poa pratensis l.) an ... | 2004 | 15074817 |