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作 者:Charlotte F.Nellist Robert J.Vickerstaff Maria K.Sobczyk César Marina-Montes Fiona M.Wilson David W.Simpson Adam B.Whitehouse Richard J.Harrison
机构地区:[1]Department of Genetics,Genomics and Breeding,NIAB EMR,New Road,East Malling ME196BJ,UK
出 处:《Horticulture Research》2019年第1期965-978,共14页园艺研究(英文)
基 金:supported by grants awarded to RJH from the Biotechnology and Biological Sciences Research Council(BBSRC-BB/K017071/1,BB/K017071/2 and BB/N006682/1).
摘 要:The cultivated strawberry,Fragaria×ananassa(Fragaria spp.)is the most economically important global soft fruit.Phytophthora cactorum,a water-borne oomycete causes economic losses in strawberry production globally.A biparental cross of octoploid cultivated strawberry segregating for resistance to P.cactorum,the causative agent of crown rot disease,was screened using artificial inoculation.Multiple putative resistance quantitative trait loci(QTL)were identified and mapped.Three major effect QTL(FaRPc6C,FaRPc6D and FaRPc7D)explained 37%of the variation observed.There were no epistatic interactions detected between the three major QTLs.Testing a subset of the mapping population progeny against a range of P.cactorum isolates revealed no significant interaction(p=0.0593).However,some lines showed higher susceptibility than predicted,indicating that additional undetected factors may affect the expression of some quantitative resistance loci.Using historic crown rot disease score data from strawberry accessions,a preliminary genome-wide association study(GWAS)of 114 individuals revealed an additional locus associated with resistance to P.cactorum.Mining of the Fragaria vesca Hawaii 4 v1.1 genome revealed candidate resistance genes in the QTL regions.
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