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您的检索式：作者名="Patrick J.Brown"
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| 1 | Sequencing a Juglans regia×J.microcarpa hybrid yields high-quality genome assemblies of parental species显示文摘Members of the genus Juglans are monecious wind-pollinated trees in the family Juglandaceae with highly heterozygous genomes,which greatly complicates genome sequence assembly.The genomes of interspecific hybrids are usually comprised of haploid genomes of parental species.We exploited this attribute of interspecific hybrids to avoid heterozygosity and sequenced an interspecific hybrid Juglans microcarpa×J.regia using a novel combination of single-molecule sequencing and optical genome mapping technologies.The resulting assemblies of both genomes were remarkably complete including chromosome termini and centromere regions.Chromosome termini consisted of arrays of telomeric repeats about 8 kb long and heterochromatic subtelomeric regions about 10 kb long.The centromeres consisted of arrays of a centromere-specific Gypsy retrotransposon and most contained genes,many of them transcribed.Juglans 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 chromosomes.Fractionation was shown to be asymmetric with one subgenome exhibiting greater gene loss than the other.The asymmetry of the process is ongoing and mirrors an asymmetry in gene expression between the subgenomes.Given the importance of J.microcarpa×J.regia hybrids as potential walnut rootstocks,we catalogued disease resistance genes in the parental genomes and studied their chromosomal distribution.We 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. | 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 | 2019 | Horticulture Research2019，6，1： | 7 |
| 2 | Genome-wide association and genomic prediction identifies soybean cyst nematode resistance in common bean including a syntenic region to soybean Rhg1 locus显示文摘A genome-wide association study(GWAS)was applied to detect single nucleotide polymorphisms(SNPs)significantly associated with resistance to Heterodera glycines(HG)also known as the soybean cyst nematode(SCN)in the core collection of common bean,Phaseolus vulgaris.There were 84,416 SNPs identified in 363 common bean accessions.GWAS identified SNPs on chromosome(Chr)1 that were significantly associated with resistance to HG type 2.5.7.These SNPs were in linkage disequilibrium with a gene cluster orthologous to the three genes at the Rhg1 locus in soybean.A novel signal on Chr 7 was detected and associated with resistance to HG type 1.2.3.5.6.7.Genomic predictions(GPs)for resistance to these two SCN HG types in common bean achieved prediction accuracy of 0.52 and 0.41,respectively.Our study generated a high-quality SNP panel for 363 common bean accessions and demonstrated that both GWAS and GP were effective strategies to understand the genetic architecture of SCN resistance in common bean. | Liwei Wen Hao-Xun Chang Patrick J.Brown Leslie L.Domier Glen L.Hartman | 2019 | Horticulture Research2019，6，1： | 0 |
| 3 | Co-located quantitative trait loci mediate resistance to Agrobacterium tumefaciens, Phytophthora cinnamomi,and P.pini in Juglans microcarpa×J.regia hybrids显示文摘Soil-borne plant pathogens represent a serious threat that undermines commercial walnut(Juglans regia)production worldwide.Crown 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 rootstocks.Here,resistance to A.tumefaciens,P.cinnamomi,and P.pini is mapped in the genome of Juglans microcarpa,a North American wild relative of cultivated walnut.Half-sib J.microcarpa mother trees DJUG 31.01 and DJUG 31.09 were crossed with J.regia cv.Serr,producing 353 and 400 hybrids,respectively.Clonally propagated hybrids were genotyped by sequencing to construct genetic maps for the two populations and challenged with the three pathogens.Resistance to each of the three pathogens was mapped as a major QTL on the long arm of J.microcarpa 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 pathogens.The 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. | 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 | 2021 | Horticulture Research2021，8，1： | 0 |
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