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Westman, A.; Kresovich, Stephen; Dickson, M. H.

doi:10.1023/a:1003544025146

Cited by 75 publications

(18 citation statements)

References 12 publications

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“…However, a number of studies show no relationship between geographic origin and traits of interest. ; Jarosz and Burdon, 1991), and multiple Brassica species (Westman et al, 1999). Other species where there was not a significant association between taxonomy or geographic origin and traits of interest include Senecio gallicus Vill.…”

Section: Comparison Of Representative and Custom Methods Of Generatinmentioning

confidence: 99%

Comparison of Representative and Custom Methods of Generating Core Subsets of a Carrot Germplasm Collection

et al. 2019

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Crop breeding programs are interested in using genetic resources but have difficulty identifying useful accessions from germplasm collections. To efficiently use the diversity present in large germplasm collections, breeders often identify a subset of accessions that represent the larger collection. Methods to identify these subsets, which are called core collections, do not consistently capture functional diversity, and breeders would benefit from methods that help create custom core collections using existing data from variety trials or breeding programs. Making use of high‐density genomic data and existing phenotypic data from a collection of 433 domesticated carrot (Daucus carota L.) accessions, we tested whether it is possible to develop custom subsets of accessions for specific breeding purposes. We found that for this collection, representative strategies were effective in developing core collections that capture the diversity of the collection, but they were no better than random sampling, likely because the collection itself is not strongly subdivided. Custom strategies generated subsets that differed from the total collection with altered genetic, geographic, and phenotypic compositions. When used as training populations for genomic prediction of the other accessions in the collection, however, these custom cores did not produce a substantial improvement over traditional core collections. Increasing the size of the core did improve prediction accuracy, suggesting that it is possible to improve the usefulness of core collections by identifying custom subsets that are large enough to represent the functional genetic diversity present in the collection.

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Section: Comparison Of Representative and Custom Methods Of Generatinmentioning

confidence: 99%

Comparison of Representative and Custom Methods of Generating Core Subsets of a Carrot Germplasm Collection

et al. 2019

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“…raphani ( Xcr ), followed by caterpillar herbivory. All stresses used here occur naturally on B. nigra in the field [42, 43]. Whereas plant defenses against chewing larvae are primarily regulated by the JA pathway, eggs and aphids activate primarily the SA pathway [35, 44–46], and defense against Xcr is mediated by SA, JA and ET [47].…”

Section: Introductionmentioning

confidence: 99%

Combined biotic stresses trigger similar transcriptomic responses but contrasting resistance against a chewing herbivore in Brassica nigra

et al. 2017

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BackgroundIn nature, plants are frequently exposed to simultaneous biotic stresses that activate distinct and often antagonistic defense signaling pathways. How plants integrate this information and whether they prioritize one stress over the other is not well understood.ResultsWe investigated the transcriptome signature of the wild annual crucifer, Brassica nigra, in response to eggs and caterpillars of Pieris brassicae butterflies, Brevicoryne brassicae aphids and the bacterial phytopathogen Xanthomonas campestris pv. raphani (Xcr). Pretreatment with egg extract, aphids, or Xcr had a weak impact on the subsequent transcriptome profile of plants challenged with caterpillars, suggesting that the second stress dominates the transcriptional response. Nevertheless, P. brassicae larval performance was strongly affected by egg extract or Xcr pretreatment and depended on the site where the initial stress was applied. Although egg extract and Xcr pretreatments inhibited insect-induced defense gene expression, suggesting salicylic acid (SA)/jasmonic acid (JA) pathway cross talk, this was not strictly correlated with larval performance.ConclusionThese results emphasize the need to better integrate plant responses at different levels of biological organization and to consider localized effects in order to predict the consequence of multiple stresses on plant resistance.Electronic supplementary materialThe online version of this article (doi:10.1186/s12870-017-1074-7) contains supplementary material, which is available to authorized users.

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“…Exploring the new resistance sources in alien Brassica species and its introgression into B. oleracea group is one of the current priority areas for black rot resistance breeding. The black rot resistance sources have been reported in A and B genomes of Brassica species (Westman et al, 1999; Taylor et al, 2002) and genes present in these genomes can be pyramided in Cole crops to provide a durable solution to this malady. The monogenomic and digenomic species in Uthant triangle carry resistance gene(s) for Xcc , which can be utilized for guarding B. oleracea genotypes against this disease using embryo rescue and somatic hybridization techniques.…”

Section: Introductionmentioning

confidence: 99%

Introgression of Black Rot Resistance from Brassica carinata to Cauliflower (Brassica oleracea botrytis Group) through Embryo Rescue

et al. 2017

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Black rot caused by Xanthomonas campestris pv. campestris (Xcc) is a very important disease of cauliflower (Brassica oleracea botrytis group) resulting into 10–50% yield losses every year. Since there is a dearth of availability of resistance to black rot disease in B. oleracea (C genome), therefore exploration of A and B genomes was inevitable as they have been reported to be potential reservoirs of gene(s) for resistance to black rot. To utilize these sources, interspecific hybrid and backcross progeny (B1) were generated between cauliflower “Pusa Sharad” and Ethiopian mustard “NPC-9” employing in vitro embryo rescue technique. Direct ovule culture method was better than siliqua culture under different temperature regime periods. Hybridity testing of F1 inter-specific plants was carried out using co-dominant SSR marker and Brassica B and C genome-specific (DB and DC) primers. Meiosis in the di-genomic (BCC) interspecific hybrid of B. oleracea botrytis group (2n = 18, CC) × B. carinata (2n = 4x = 34, BBCC) was higly disorganized and cytological analysis of pollen mother cells revealed chromosomes 2n = 26 at metaphase-I. Fertile giant pollen grain formation was observed frequently in interspecific F1 hybrid and BC1 plants. The F1 inter-specific plants were found to be resistant to Xcc race 1. Segregation distortion was observed in BC1 generation for black rot resistance and different morphological traits. The At1g70610 marker analysis confirmed successful introgression of black rot resistance in interspecific BC1 population. This effort will go a long way in pyramiding gene(s) for resistance against black rot in Cole crops, especially cauliflower and cabbage for developing durable resistance, thus minimize dependency on bactericides.

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Cited by 75 publications

References 12 publications

Comparison of Representative and Custom Methods of Generating Core Subsets of a Carrot Germplasm Collection

Comparison of Representative and Custom Methods of Generating Core Subsets of a Carrot Germplasm Collection

Combined biotic stresses trigger similar transcriptomic responses but contrasting resistance against a chewing herbivore in Brassica nigra

Introgression of Black Rot Resistance from Brassica carinata to Cauliflower (Brassica oleracea botrytis Group) through Embryo Rescue

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