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Co-located quantitative trait loci mediate resistance to Agrobacterium tumefaciens, Phytophthora cinnamomi,and *** in Juglans microcarpa×*** hybrids

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Horticulture Research 2021年第1期8卷 1363-1373页

作者： Ramesh K.Ramasamy Ming-Cheng Luo Charles A.Leslie Dianne Velasco Natalia Ott Ali McClean Abhaya M.Dandekar Mallikarjuna Aradhya Patrick J.Brown Gregory T.Browne daniel a.kluepfel Andreas Westphal Jan Dvorak Department of Plant Sciences University of CaliforniaDavisUSA USDA-ARS Crops Pathology and Genetics Research Unit Department of Plant PathologyUniversity of CaliforniaDavisUSA National Clonal Germplasm Repository USDA-ARSUniversity of CaliforniaDavisUSA Department of Nematology University of CaliforniaRiversideUSA

Soil-borne plant pathogens represent a serious threat that undermines commercial walnut(Juglans regia)production *** gall,caused by Agrobacterium tumefaciens,and Phytophthora root and crown rots,caused by various Phytophthora spp.,are among the most devastating walnut soil-borne diseases.A recognized strategy to combat soil-borne diseases is adoption of resistant ***,resistance to ***,***,and *** is mapped in the genome of Juglans microcarpa,a North American wild relative of cultivated ***-sib *** mother trees DJUG 31.01 and DJUG 31.09 were crossed with *** ***,producing 353 and 400 hybrids,*** propagated hybrids were genotyped by sequencing to construct genetic maps for the two populations and challenged with the three *** to each of the three pathogens was mapped as a major QTL on the long arm of *** chromosome 4D and was associated with the same haplotype,designated as haplotype b,raising the possibility that the two mother trees were heterozygous for a single Mendelian gene conferring resistance to all three *** deployment of this haplotype in rootstock breeding will facilitate breeding of a walnut rootstock resistant to both crown gall and Phytophthora root and crown rots.

关键词： breeding regia soil

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Sequencing a Juglans regia×*** hybrid yields high-quality genome assemblies of parental species

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Horticulture Research 2019年第1期6卷 1271-1286页

作者： Tingting Zhu Le Wang Frank M.You Juan C.Rodriguez Karin R.Deal Limin Chen Jie Li Sandeep Chakraborty Bipin Balan Cai-Zhong Jiang Patrick J.Brown Charles ALeslie Mallikarjuna KAradhya Abhaya M.Dandekar Patrick E.McGuire daniel kluepfel Jan Dvorak Ming-Cheng Luo Department of Plant Sciences University of CaliforniaDavisCA 95616USA Ottawa Research and Development Centre Agriculture and Agri-Food CanadaOttawaON K1A 0C6Canada Genome Center University of CaliforniaDavisCA 95616USA Crops Pathology and Genetics Research Unit USDA-ARSDavisCA 95616USA National Clonal Germplasm Repository USDA-ARSDavisCA 95616USA

Members of the genus Juglans are monecious wind-pollinated trees in the family Juglandaceae with highly heterozygous genomes,which greatly complicates genome sequence *** genomes of interspecific hybrids are usually comprised of haploid genomes of parental *** exploited this attribute of interspecific hybrids to avoid heterozygosity and sequenced an interspecific hybrid Juglans microcarpa×*** using a novel combination of single-molecule sequencing and optical genome mapping *** resulting assemblies of both genomes were remarkably complete including chromosome termini and centromere *** termini consisted of arrays of telomeric repeats about 8 kb long and heterochromatic subtelomeric regions about 10 kb *** centromeres consisted of arrays of a centromere-specific Gypsy retrotransposon and most contained genes,many of them *** genomes evolved by a whole-genome-duplication dating back to the Cretaceous-Paleogene boundary and consist of two subgenomes,which were fractionated by numerous short gene deletions evenly distributed along the length of the *** was shown to be asymmetric with one subgenome exhibiting greater gene loss than the *** asymmetry of the process is ongoing and mirrors an asymmetry in gene expression between the *** the importance of ***×*** hybrids as potential walnut rootstocks,we catalogued disease resistance genes in the parental genomes and studied their chromosomal *** also estimated the molecular clock rates for woody perennials and deployed them in estimating divergence times of Juglans genomes and those of other woody perennials.

关键词： Juglans parental evenly

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