| isolation and partial characterization of a lectin from euphorbia heterophylla seeds. | an n-acetylgalactosamine-specific lectin was isolated from euphorbia heterophylla seeds by affinity chromatography on cross-linked arabinogalactan. it is a dimeric protein of two identical subunits of mr 32 000, and differs structurally from all previously known euphorbiaceae lectins. its distribution over the seed is typical in that it is merely confined to the primary axes. | 1983 | 6626171 |
| antinociceptive activity of euphorbia heterophylla roots. | following an identified use of the plant as analgesic in traditional medicine, the hexane, chloroform and ethyl acetate extracts of euphorbia heterophylla root have been tested for antinociceptive activity in rats. all extracts showed significant effects at doses of 150-300 mg/kg i.p. | 2000 | 11449508 |
| diet of eared doves (zenaida auriculata, aves, columbidae) in a sugar-cane colony in south-eastern brazil. | farmers in the paranapanema valley (são paulo, brazil) have reported problems with flocks of eared doves (zenaida auriculata) eating sprouting soybeans. in this region these birds breed colonially in sugar-cane, and eat four crop seeds, using 70% of the dry weight, in the following order of importance: maize, wheat, rice, and soybeans. three weeds (euphorbia heterophylla, brachiaria plantaginea, and commelina benghalensis) were important. this information suggests that the doves adapted particul ... | 2001 | 12071322 |
| multiple forms of endo-1,4-beta-glucanases in the endosperm of euphorbia heterophylla l. | germinating seeds of euphorbia heterophylla l. contain endo-1,4-beta-glucanases which degrade carboxymethylcellulose (cmc). the activity decreased approximately 66% in extracts of endosperm containing isopropanol or ethanol. the endoglucanases were isolated from endosperm extracts using ammonium sulphate fractionation followed by sephacryl s-100-hr chromatography resulting in two main peaks: i and ii. peak i endoglucanase was further purified about 15-fold on deae-sephadex a50 and then by affini ... | 2003 | 12885862 |
| synthesis of new aliphatic and aromatic phytotoxic derivatives of 2alpha,4alpha-dimethyl-8-oxabicyclo[3.2.1]oct-6-en-3-one. | several new compounds with potential herbicidal activity were synthesized from 2alpha,4alpha-dimethyl-6,7-exo-isopropylidenedioxy-8-oxabicyclo[3.2.1]octan-3-one (4). seven aromatic alcohols were prepared by reaction of (4) with aryllithium reagents, where the aryl groups were 4-ethoxyphenyl (5, 70% yield), 4-ethylphenyl (6, 82% yield), 4-butylphenyl (7, 78% yield), 4-tert-butylphenyl (8, 81% yield), 2,4-dimethoxyphenyl (9, 75% yield), 2-ethylphenyl (10, 12% yield) and para-(4-bromophenoxy)phenyl ... | 2003 | 12974357 |
| cross resistance to als-inhibiting herbicides in euphorbia heterophylla l. biotypes resistant to imazethapyr. | the effect of weeds on the diminution of agricultural production is considered to be between 30 and 50%. imazethapyr is a herbicide which acts on the enzyme als, the first common enzyme in the biosynthetic pathway of valine, leucine and isoleucine. euphorbia heterophylla is a common species in soybean fields in brazil and different populations resistant to herbicides of the sulfonylurea and imidazolinone groups are currently being reported. the objectives of this work were: to determine the resi ... | 2003 | 15149128 |
| structural characterization of rubber from jackfruit and euphorbia as a model of natural rubber. | a structural study of low molecular weight rubbers from jackfruit (artocarpus heterophyllus) and painted spurge (euphorbia heterophylla) was carried out as model compounds of natural rubber from hevea brasiliensis. the rubber content of latex from jackfruit was 0.4-0.7%, which is very low compared with that of 30-35% in the latex from hevea tree. the rubber from jackfruit latex was low molecular weight with narrow unimodal molecular weight distribution (mwd), whereas that obtained from e. hetero ... | 2004 | 15360318 |
| allelopathic effects of aconitic acid on wild poinsettia (euphorbia heterophylla) and morningglory (ipomoea grandifolia). | high infestations of alexandergrass (brachiaria plantaginea) in experimental area have reduced seedbank of some weed species in soil at a greater degree compared to those obtained with the use of an efficient herbicide. aconitic acid (aa) has been identified in those plants in high concentration. thus, two experiments were carried out in the laboratory to determine the effects of pure aa on weed seed germination and on endophytic fungi in wild poinsettia (euphorbia heterophylla) and morningglory ... | 2005 | 15656164 |
| multiple resistance of acetolactate synthase and protoporphyrinogen oxidase inhibitors in euphorbia heterophylla biotypes. | resistance to acetolactate synthase (als)-inhibiting herbicides in brazil has been documented for six species. the probability to select biotypes of euphorbia heterophylla (epphl) with multiple resistance increases in the same order of magnitude as the use of other herbicides belonging to only one mechanism of action. the objectives of this work were to evaluate the distribution of resistant populations (r) in the states of the parana and santa catarina; to determine the existence of populations ... | 2005 | 15656167 |
| population dynamics of weeds in no-tillage and conventional crop systems. | population dynamics of weeds in successive maize and bean crops were evaluated in two soil management systems (conventional and no-tillage), for two maize applications (grain and silage), and in four consecutive growing seasons. every year, conventional tillage consisted in plowing and harrowing before sowing. in no-tillage, chemical weed desiccation was made with the mixture glyphosate + 2.4-d. to control weeds, the mixture fluazifop-p-butil + fomesafen was applied on the bean crop in all the p ... | 2005 | 15656169 |
| fungal pathogens of euphorbia heterophylla and e. hirta in brazil and their potential as weed biocontrol agents. | a two-year survey of the fungi associated with two important congeneric pantropical weeds, euphorbia heterophylla and e. hirta, was conducted in part of their native range in southern brazil. sampling was concentrated mainly in rio de janeiro state and ten species were identified as pathogens of these weeds. two taxa, botrytis ricini and uromyces euphorbiae, were common to both weed hosts. alternaria euphorbiicola, bipolaris euphorbiae, melampsora sp., oidium sp. and sphaceloma poinsettiae were ... | 1998 | 16284862 |
| synthesis of new phytogrowth-inhibitory substituted aryl-p-benzoquinones. | reaction of [(2-alkyloxy)methyl]-1,4-dimethoxybenzene 10 (alkyl=butyl, hexyl, decyl, tridecyl, tetradecyl, hexadecyl, and octadecyl) with ceric ammonium nitrate in order to produce p-benzoquinones (=cyclohexa-2,5-diene-1,4-diones) afforded 5-[(alkyloxy)methyl]-2-(4-formyl-2,5-dimethoxyphenyl)benzo-1,4-quinones 12a-12g in yields that varied from 46 to 97%, accompanied by 2-[(alkyloxy)methyl]benzo-1,4-quinones 11a-11g in only small quantities (< or =5%). these quinones resemble the natural phytoto ... | 2006 | 17193291 |
| review of potential environmental impacts of transgenic glyphosate-resistant soybean in brazil. | transgenic glyphosate-resistant soybeans (grs) have been commercialized and grown extensively in the western hemisphere, including brazil. worldwide, several studies have shown that previous and potential effects of glyphosate on contamination of soil, water, and air are minimal, compared to those caused by the herbicides that they replace when grs are adopted. in the usa and argentina, the advent of glyphosate-resistant soybeans resulted in a significant shift to reduced- and no-tillage practic ... | 2007 | 17562462 |
| voluntary intake, chemical composition and in vitro digestibility of fresh forages fed to guinea pigs in periurban rearing systems of kinshasa (democratic republic of congo). | the daily voluntary intake (dvi) of guinea pigs (gp) fed 15 fresh forages used in periurban rearing systems of kinshasa (democratic republic of congo) was investigated. in order to determine the best forages combination for gp diet, dvi was compared to their nutritional value measured in vitro using (1) a pepsin-pancreatin hydrolysis, (2) an gas fermentation test on the hydrolysed residues with an inoculum prepared from gp faeces, and (3) the chemical composition of the offered feeds and the hyd ... | 2007 | 17966272 |
| glyphosate-resistant weeds of south american cropping systems: an overview. | herbicide resistance is an evolutionary event resulting from intense herbicide selection over genetically diverse weed populations. in south america, orchard, cereal and legume cropping systems show a strong dependence on glyphosate to control weeds. the goal of this report is to review the current knowledge on cases of evolved glyphosate-resistant weeds in south american agriculture. the first reports of glyphosate resistance include populations of highly diverse taxa (lolium multiflorum lam., ... | 2008 | 18161884 |
| evolved glyphosate-resistant weeds around the world: lessons to be learnt. | glyphosate is the world's most important herbicide, with many uses that deliver effective and sustained control of a wide spectrum of unwanted (weedy) plant species. until recently there were relatively few reports of weedy plant species evolving resistance to glyphosate. since 1996, the advent and subsequent high adoption of transgenic glyphosate-resistant crops in the americas has meant unprecedented and often exclusive use of glyphosate for weed control over very large areas. consequently, in ... | 2008 | 18273881 |
| bidens pilosa l. exhibits high sensitivity to coumarin in comparison with three other weed species. | nine natural plant compounds were screened for phytotoxicity to bidens pilosa l. a troublesome weed in field and plantation crops. the sensitivity of three other weed species to coumarin, the most active identified compound, was also evaluated. coumarin, at a concentration of 500 microm, had little effect on germination and growth of senna obtusifolia l., euphorbia heterophylla l., and ipomoea grandifolia l. when compared with its effects on b. pilosa l. in a concentration range of 10-100 microm ... | 2008 | 18338136 |
| chromosome number and cytogenetics of euphorbia heterophylla l. | euphorbia heterophylla l. (euphorbiaceae) is a herbaceous species of great economic importance due to its invasive potential and consequent damage to agriculture and pasture land. for the first time, we provide information on its chromosome number, morphology, and behavior of mitotic chromosomes. seeds were germinated and submitted to four treatments to obtain metaphases: 0.5% colchicine for 2 to 5 h, at ambient temperature; 0.5% colchicine for 16 to 24 h; 0.0029 m 8-hydroxyquinoline (8-hq) for ... | 2008 | 18393225 |
| [mites (acari) from rubber trees (hevea brasiliensis muell. arg., euphorbiaceae) and spontaneous euphorbiaceous in rubber trees cultivation]. | quarterly samples were done in 2001 on three rubber tree plantation in the northwest of the state of são paulo. three rubber trees of each locality were sampled. between the rows of rubber tree four species of spontaneous euphorbiaceous were collected: chamaesyce hirta, c. hyssopifolia, euphorbia heterophylla and phyllanthus tenellus. a total of 8.954 mites of 38 species, belonging to 31 genera of 11 families were collected. tydeidae and phytoseiidae had the highest diversity of species, 9 and 7 ... | 2008 | 18813750 |
| antisickling activity of anthocyanins from bombax pentadrum, ficus capensis and ziziphus mucronata: photodegradation effect. | a survey was conducted in lubumbashi city (democratic republic of congo) in order to: (a) identify medicinal plants used by traditional healers in the management of sickle cell anaemia, (b) verify their antisickling activity in vitro, (c) determine the most active plants, and (d) verify if anthocyanins are responsible of the bioactivity and study their photodegradation effect. | 2008 | 18930798 |
| distribution and diversity of geminiviruses in trinidad and tobago. | abstract seven crop and eight weed species from 12 agricultural locations in trinidad and tobago were assayed for the presence of whitefly-transmitted geminiviruses (wtgs) by using dot blot hybridization and polymerase chain reaction (pcr) amplification of the n-terminal coat protein sequence with degenerate primers. the amplified fragments were cloned and analyzed by restriction enzyme digestion to determine fragment length polymorphism among the cloned fragments. representative clones were the ... | 1998 | 18944827 |
| the phytotoxic effect of exogenous ethanol on euphorbia heterophylla l. | this study investigated the effects of exogenously applied ethanol on euphorbia heterophylla l., a troublesome weed in field and plantation crops. ethanol at concentrations ranging from 0.25 to 1.5% caused a dose-dependent inhibition of germination and growth of e. heterophylla. measurements of respiratory activity and alcohol dehydrogenase (e.c. 1.1.1.1) activity during seed imbibition and initial seedling growth revealed that ethanol induces a prolongation of hypoxic conditions in the growing ... | 2009 | 19640725 |
| complete nucleotide sequence of an isolate of euphorbia mosaic virus that infects euphorbia heterophylla and wissadula amplissima in jamaica. | | 2009 | 19774336 |
| identification of begomoviruses infecting crops and weeds in belize. | plants including pepper, red kidney bean, squash, string bean and tomato, as well as weeds with viral symptoms were collected from five districts in belize over a three year period with the aim of determining the diversity of the begomoviruses present. sixty five percent of the samples screened via dna hybridization produced signals indicative of begomovirus infection. subsequent pcr amplifications and nucleotide sequence analyses revealed the presence of four begomoviruses in belize. pepper gol ... | 2008 | 20596296 |
| agricultural impacts of glyphosate-resistant soybean cultivation in south america. | in the 2009/2010 growing season, brazil was the second largest world soybean producer, followed by argentina. glyphosate-resistant soybeans (grs) are being cultivated in most of the soybean area in south america. overall, the grs system is beneficial to the environment when compared to conventional soybean. grs resulted in a significant shift toward no-tillage practices in brazil and argentina, but weed resistance may reduce this trend. probably the highest agricultural risk in adopting grs in b ... | 2010 | 20839871 |
| molecular and biological characterization of a new brazilian begomovirus, euphorbia yellow mosaic virus (euymv), infecting euphorbia heterophylla plants. | to date, no begomovirus has been fully characterized from euphorbia heterophylla, a widely distributed weed, in brazil. here, we show the occurrence of a new begomovirus on e. heterophylla plants showing bright yellow mosaic. the bipartite viral genome was cloned from 10 samples, and all clones are almost identical to each other (95.6-98.8% nucleotide sequence identity). the dna-a sequences shared a maximum nucleotide sequence identity of 87.3% with euphorbia mosaic peru virus (eumpv) and thus w ... | 2011 | 21779908 |
| molecular characterization of a new begomovirus that infects euphorbia heterophylla and solanum lycopersicum in venezuela. | we report the complete nucleotide sequence of a begomovirus isolate infecting euphorbia heterophylla and tomato (solanum lycopersicum) in central venezuela. based on the current taxonomic criteria for the genus begomovirus, the isolate was shown to represent a novel species, tentatively named euphorbia mosaic venezuela virus (eumvv). its dna-a is most closely related to those of euphorbia-infecting begomoviruses from the caribbean and central america. the dna b component forms a phylogenetic clu ... | 2011 | 22052541 |
| Begomoviruses infecting weeds in Cuba: increased host range and a novel virus infecting Sida rhombifolia. | As a result of surveys conducted during the last few years to search for wild reservoirs of begomoviruses in Cuba, we detected a novel bipartite begomovirus, sida yellow mottle virus (SiYMoV), infecting Sida rhombifolia plants. The complete genome sequence was obtained, showing that DNA-A was 2622 nucleotides (nt) in length and that it was most closely related (87.6% nucleotide identity) to DNA-A of an isolate of sida golden mosaic virus (SiGMV) that infects snap beans (Phaseolus vulgaris) in Fl ... | 2011 | 21964921 |
| effect of a supplementation of euphorbia heterophylla on nutritional meat quality of guinea pig (cavia porcellus l.). | the aim of the present work was to study the effect of dietary supplementation of euphorbia heterophylla on the quality of the guinea pig meat. forty guinea pigs were divided into two groups fed ad libitum during 46 days a panicum maximum diet (panicum diet) or a mixed diet (75% panicum maximum+25% euphorbia heterophylla) (paneuphorbia diet) to compare their effects on performances and on the composition of guinea pig tissues and carcass. daily weight gain, liver weight, carcass yield, and the l ... | 2012 | 23305832 |
| genome sequence of euphorbia mosaic virus from passionfruit and euphorbia heterophylla in florida. | euphorbia mosaic virus (eumv) was found in a symptomatic passionfruit (passiflora edulis) plant from homestead, florida, usa, as well as in the symptomatic weed euphorbia heterophylla this is the first identification of eumv in florida and the united states and the first report of a natural infection of passionfruit by eumv. | 2017 | 28254981 |
| a study of weeds as potential inoculum sources for a tomato-infecting begomovirus in central brazil. | tomato severe rugose virus (tosrv) is the most important begomovirus species in brazilian tomato production. many weeds are associated with tomato, and some are hosts of begomoviruses. only one species of weed, nicandra physaloides, has been found to be infected with tosrv. in this study, four weed species were investigated for their capacity to be infected by tosrv and serve as a potential source of inoculum for tomato. begomoviruses from naturally infected crotalaria spp., euphorbia heterophyl ... | 2013 | 23489523 |
| performance of bemisia tabaci (genn.) biotype b (hemiptera: aleyrodidae) on weeds. | bemisia tabaci (genn.) biotype b (hemiptera: aleyrodidae) is regarded as a pest with a large number of hosts, including crops and weeds. the performance of this whitefly on seven weeds was evaluated in order to identify the most suitable host. the following weeds that are very common in intense agricultural areas in the state of são paulo, brazil, were selected for this study: spurge (euphorbia heterophylla), beggarticks (bidens pilosa), red tasselflower (emilia sonchifolia), small-flower galins ... | 2014 | 27194066 |
| tetraoxanes as a new class of efficient herbicides comparable with commercial products. | several 1,2,4,5-tetraoxanes were synthesised, and their herbicidal activity was tested against weeds and compared with the activity of commercial herbicides glyphosate and imazethapyr. | 2015 | 25157959 |
| mercury sensing and toxicity studies of novel latex fabricated silver nanoparticles. | safe and eco-friendly alternatives to currently used hazardous chemico-physical methods of silver nanoparticles (agnps) synthesis are need of time. rapid, low cost, selective detection of toxic metals in environmental sample is important to take safety action. toxicity assessment of engineered agnps is essential to avoid its side effects on human and non-target organisms. in the present study, biologically active latex from euphorbia heterophylla (poinsettia) was utilized for synthesis of agnps. ... | 2014 | 24803140 |
| the influence of microhabitat on the population dynamics of four herbaceous species in a semiarid area of northeastern brazil. | variation in annual rainfall is considered the most important factor influencing population dynamics in dry environments. however, different factors may control population dynamics in different microhabitats. this study recognizes that microhabitat variation may attenuate the influence of climatic seasonality on the population dynamics of herbaceous species in dry forest (caatinga) areas of brazil. we evaluated the influence of three microhabitats (flat, rocky and riparian) on the population dyn ... | 2016 | 26909622 |
| the influence of microhabitat on the population dynamics of four herbaceous species in a semiarid area of northeastern brazil. | variation in annual rainfall is considered the most important factor influencing population dynamics in dry environments. however, different factors may control population dynamics in different microhabitats. this study recognizes that microhabitat variation may attenuate the influence of climatic seasonality on the population dynamics of herbaceous species in dry forest (caatinga) areas of brazil. we evaluated the influence of three microhabitats (flat, rocky and riparian) on the population dyn ... | 2016 | 26840573 |
| euphorbia heterophylla leaf extract mediated green synthesis of ag/tio2 nanocomposite and investigation of its excellent catalytic activity for reduction of variety of dyes in water. | this work reports a facile and green synthesis of ag/tio2 nanocomposite by extract of leaves of euphorbia heterophylla without any stabilizer or surfactant. the green synthesized ag/tio2 nanocomposite was characterized by field emission scanning electron microscope (fesem), energy-dispersive x-ray spectroscopy (eds), fourier-transform infrared (ft-ir) spectroscopy, x-ray diffraction analysis (xrd) and uv-vis. the ag/tio2 nanocomposite was found to be effective catalyst for reduction of various d ... | 2016 | 26469545 |
| purification and characterization of a thermostable caseinolytic serine protease from the latex of euphorbia heterophylla l. | a new thermostable caseinolytic serine protease was purified from the latex of euphorbia heterophylla l. to electrophoretic homogeneity by a procedure involving successive steps of pretreatment of the latex, peg fractionation, cm-cellulose chromatography and deae-cellulose chromatography. the purified protease was found to be a monomeric protein of molecular weight 77.2 kda. it exhibited caseinolytic activity with hyperbolic azocasein saturation with vmax and km values of 0.11 units.ml(-1) and 0 ... | 2015 | 26149399 |
| accumulation of non-utilizable starch in laticifers of euphorbia heterophylla and e. myrsinites. | starch biosynthesis and degradation was studied in seedlings and mature plants of euphorbia heterophylla l. and e. myrsinites l. mature embryos, which lack starch grains in the non-articulated laticifers, develop into seedlings that accumulate starch rapidly when grown either in the light or the dark. starch accumulation in laticifers of dark-grown seedlings was ca. 47 and 43% of total starch in light-grown controls in e. heterophylla and e. myrsinites, respectively. in light-grown seedlings, st ... | 1978 | 24408254 |