| complex segregation analysis of gerbera flower colour. | the distribution of hue (cielab colour notation) classes among flowers of the davis population of gerbera (gerbera jamesonii h. bolus ex hooker) appears bimodal. this suggests that the genetic control of hue is determined by the segregation of a gene with large effect modified by additional genes with smaller effects. complex segregation analysis (csa), routinely employed in human genetic epidemiology, was used to study both qualitative and quantitative variation. csa applies pedigree analysis t ... | 1995 | 7706116 |
| comparison of cultivars of ornamental crop gerbera jamesonii on production of spider mite-induced volatiles, and their attractiveness to the predator phytoseiulus persimilis. | we investigated whether volatiles produced by spider mite-damaged plants of four gerbera cultivars differ in attractiveness to phytoseiulus persimilis, a specialist predator of spider mites, and how the mite-induced odor blends differ in chemical composition. the gerbera cultivars differed in resistance, as expressed in terms of spider mite intrinsic rate of population increase (rm). in order of increasing resistance these were sirtaki, rondena, fame, and bianca. to correct for differences in da ... | 2001 | 11504033 |
| activity of an essential oil derived from chenopodium ambrosioides on greenhouse insect pests. | this study involved both greenhouse and laboratory experiments evaluating the effect of an essential oil product (qrd 400) derived from chenopodium ambrosioides variety nr. ambrosioides l. (chenopodiaceae) on greenhouse insect pests that feed on different plant parts: citrus mealybug, planococcus citri (risso); longtailed mealybug, pseudococcus longispinus (targioni tozzetti); western flower thrips, frankliniella occidentalis (pergande), and fungus gnats (bradysia spp.). treatments were applied ... | 2007 | 17461071 |
| susceptibility of gerbera and chrysanthemum varieties (gerbera jamesoni and chrysanthemum morifolium) to fusarium oxysporum f.sp. chrysanthemi. | in 2002, gerbera plants (cv kaliki) were observed exhibiting symptoms of a wilt in a soilless cultivation at albenga area (northern italy). a similar wilt was also observed in the sanremo area (northern italy) on cv red bull, anedin and gud finger grown in soil. the same observations were carried out in 2004 in sw spain where gerbera plants showing wilt symptoms were observed in soilless crops. in all cases, the planting material originated from the netherlands. recently on the base of experimen ... | 2007 | 18396800 |
| detection of carbohydrates and steroids by cation-enhanced nanostructure-initiator mass spectrometry (nims) for biofluid analysis and tissue imaging. | nanostructure-initiator mass spectrometry (nims) is a highly sensitive, matrix-free technique that is well suited for biofluid analysis and imaging of biological tissues. here we provide a new technical variation of nims to analyze carbohydrates and steroids, molecules that are challenging to detect with traditional mass spectrometric approaches. analysis of carbohydrates and steroids was accomplished by spray depositing nacl or agno(3) on the nims porous silicon surface to provide a uniform env ... | 2010 | 19961200 |
| susceptibility of chrysanthemum and paris daisy varieties to several isolates of fusarium oxysporum f. sp. chrysanthemi. | fusarium oxysporum f.sp. chrysonthemi is a pathogen recently reported in italy on four economically important ornamental crops belonging to the compositae family: chrysanthemum (chrysanthemum morifolium), paris daisy (argyranthemum frutescens), african daisy (osteospermum sp.) and gerbera (gerbera jamesonii). the risk of transmission of the pathogen among these species is high because the hosts are frequently cultivated in the same nursery. the susceptibility of 24 paris daisy and 12 chrysanthem ... | 2009 | 20222547 |
| complete sequence of rna3 of cucumber mosaic virus isolates infecting gerbera jamesonii suggests its grouping under ib subgroup. | the complete rna3 genome of cucumber mosaic virus (cmv) was amplified by rt-pcr from three infected gerbera (gerbera jamesonii) leaf samples exhibiting severe chlorotic mosaic and flower deformation symptoms. the amplicons obtained were cloned sequenced and deposited in genbank under the accessions jn692495, jx913531 (from cv. zingaro) and jx888093 (from cv. silvester). these sequences shared 98-99 % identities to each other and with a strain of cmv-banana reported from india, and 90-95 % identi ... | 2014 | 25674612 |
| sensitivity of bedding plants to southern root-knot nematode, meloidogyne incognita race 3. | thirty-two cultivars of 10 commonly-grown bedding plants, representing eight families, were evaluated for their response to infection by the root-knot nematode, meloidogyne incognita race 3, under greenhouse conditions. four ageratum cultivars, two marigold, and two salvia cultivars were rated resistant after exposure for 8 weeks. four begonia, four celosia, one dianthus, one verbena, one vinca, and three pansy cultivars were susceptible. three salvia, one begonia, one gerber, one verbena, and t ... | 1994 | 19279964 |
| detection of a related difference in efficacy of azadirachtin treatments for the control of whiteflies on gerbera jamesonii by testing for interactions in generalised linear models. | within a project cluster, systemical effects of two neem treatments (neem azal u and neem pellet) on the number of trialeurodes vaporariorum (westw.) in gerbera jamesonii flori line maxi were investigated. in order to minimise adverse ecological effects of a product, a new plant protection product can be declared as superior to a reference if it shows the same or a higher effect at a lower dosage. | 2010 | 19924680 |
| a parenchymatic medium solidifier for plant in vitro culture. | a new material for the solidification of liquid culture media was prepared from plant parenchyma tissues by mechanical subdivision, solute extration and dessication from ethanol. it is suitable for in vitro culture and propagation of callus as well as shoot tip cultures. the following plant materials have been grown by means of the new medium solidifier: shoot cultures of betula pendula roth, gerbera jamesonii h. bolus ex hook and floribunda rose "triumph", callus tissues of daucus carota l. and ... | 1987 | 24248936 |
| studies on quality and vase life of cut gerbera jamesonii cv. 'balance' flowers by silver nanoparticles and chlorophenol. | cut gerbera flowers are sensitive to microbial contamination and have a short vase life. silver nanoparticles are used in various applications as an antimicrobial agent. an experiment was conducted to determine the effect of different concentrations of snp and chlorophenol to extend the vase life and postharvest quality of gerbera (gerberajamesonii cv. 'balance') cut flowers. cut gerbera flowers were kept in solutions containing 0, 5, 10 and 20 mg l(-1) snp and/or 0, 5 and 10 mm chlorophenol for ... | 2015 | 25895266 |
| gerbera micropropagation. | gerbera jamesonii (gerbera) is an important cut-flower in the global floricultural industry. micropropagation is the main system used to clonally propagate gerbera in vitro resulting in the production of millions of plantlets each year. numerous types of explants and protocols for micropropagation have been established and used for gerbera. shoot tips are the commonly used explant while adventitious shoot induction from the capitulum is also a popular method. most papers in the literature have f ... | 2013 | 23743093 |
| micropropagation of gerbera (gerbera jamesonii bolus). | gerbera (gerbera jamesonii bolus) is one of the most popular ornamental flowers worldwide and used both as cut flower and potted plant. some of them show excellent agronomic characters such as color, floral diameter, stem length, and vigor, which make this plant of commercial importance. conventionally, multiplication is done through seeds or rhizome cuttings. rapid multiplication of elite cultivars of gerbera, with improved agronomic traits, has been achieved by using both direct and indirect t ... | 2013 | 23179709 |
| evaluation of the utility of the random amplified polymorphic dna method and of the semi-specific pcr to assess the genetic diversification of the gerbera jamesonii bolus line. | an attempt was made to evaluate the utility of a method which employs semi-specific pcr using partially specific primers for the coding sequence (et) at the exon-intron contact and of the rapd method to identify eight polish cultivars of gerbera. it was demonstrated that the pcr method which employs semi-specific primers is as simple and economical as the rapd method, simultaneously the images of the multiplied by means of the semi-specific pcr method dna fragments are more complex and polymorph ... | 2012 | 22593685 |
| tetranychus urticae (acari: tetranychidae) on gerbera jamesonii bolus and hook (asteraceae). | gerbera (gerbera jamesonii bolus and hook,) is an ornamental asteraceae of great commercial value, and pests can affect adversely its cultivation. more than 20 species of arthropods cause economic damage on gerbera, among them the two spotted mite, tetranychus urticae koch, 1836 (acari: tetranychidae), considered a key pest for this and other ornamental plants. in this work, some life-cycle aspects of t. urticae on gerbera, considered important for the knowledge of its population dynamics and fo ... | 2009 | 19967183 |
| growth optimization and organogenesis of gerbera jamesonii bolus ex. hook f. in vitro. | regeneration potentials in gerbera jamesonii bolus ex. hook f. from tissues culture system was studied using leaf, petiole and root explants. in vitro regeneration, callus induction and root formation were optimized by manipulation of growth regulators during organogenesis. various kinds of plant growth regulators such as 6-benzylaminopurine (bap), alpha-naphthalene acetic acid (naa), 2, 4-dichlorophenoxyacetic acid (2,4-d), indole-3-acetic acid (iaa), indole-3-butyric acid (iba), n6-[2-isopente ... | 2008 | 18817245 |
| storage temperature affects the quality of cut flowers from the asteraceae. | the respiration of cut flowers of gerbera (gerbera jamesonii h. bolus ex hook.f. 'vesuvio') and sunflower (helianthus annuus l.) increased exponentially with increasing storage temperature. poststorage vase life and negatively gravitropic bending of the neck of the flowers were both strongly affected by simulated transport at higher temperatures. vase life and stem bending after dry storage showed highly significant linear relationships (negative and positive, respectively) with the rate of resp ... | 2002 | 12807136 |
| response of gerbera jamesonii acrocarpous callus stimulated by mechanical vibration. | applying different mechanical vibrations, 2-3 hz frequency, to stimulate the gerbera jamesonii acrocarpous callus, we found that it increases the growth rate and the content of soluble protein but decreases the fluidity of cell membranes. when the frequency was greater than 4 hz, the effect was contrary to that of 2-3 hz. in this paper, we also prove the double effects in the plant callus growth and explore the mechanism of the double effects in physical stimulation. | 2001 | 11397627 |
| callus induction, regeneration of haploid plants and chromosome doubling in ovule cultures of pot gerbera (gerbera jamesonii). | gynogenetic plants of pot gerbera (gerbera jamesonii) were successfully produced from cultures of unpollinated ovulesin vitro. genotypic variations in the number of ovules that formed callus were found among the lines tested. one particularly responsive genotype was found among 17 genotypes tested where the frequency of callus-forming ovules was 17.5%. four genotypes formed no callus at all. the frequency of shoot formation from the callus varied from 0-19.6% in nine genotypes. ploidy was determ ... | 1996 | 24178643 |