Draft genome sequence of cauliflower(Brassica oleracea L.var.botrytis)provides new insights into the C genome in Brassica species

查看全文 作　　者：Deling [1]Sun;Chunguo [2]Wang;Xiaoli [3]Zhang;Wenlin [4]Zhang;Hanmin [3]Jiang;Xingwei [3]Yao;Lili [3]Liu;Zhenghua [3]Wen;Guobao [3]Niu;Xiaozheng [3]Shan

机构地区：[1]Tianjin Academy of Agricultural Sciences,300192 Tianjin,China;[2]College of Life Sciences,Nankai University,300071 Tianjin,China;[3]Tianjin Kernel Vegetable Research Institute,300384 Tianjin,China;[4]Novogene Bioinformatics Institute,100015 Beijing,China

出　　处：《Horticulture Research》索引2019年第6卷第1期,共11页

基　　金：supported by grants from the National Key Research and Development Program of China(2017YFD0101805);the Modern Agro-Industry Technology Research System,China(CARS-23-A-07);the Vegetable Modern Agro-Industry Technology Research System,Tianjin(ITTVRS2017004);the Natural Science Foundation of China(No.31872115). 摘　　要：Cauliflower is an important variety of Brassica oleracea and is planted worldwide.Here,the high-quality genome sequence of cauliflower was reported.The assembled cauliflower genome was 584.60 Mb in size,with a contig N50 of 2.11 Mb,and contained 47,772 genes;56.65%of the genome was composed of repetitive sequences.Among these sequences,long terminal repeats(LTRs)were the most abundant(32.71%of the genome),followed by transposable elements(TEs)(12.62%).Comparative genomic analysis confirmed that after an ancient paleohexaploidy(γ)event,cauliflower underwent two whole-genome duplication(WGD)events shared with Arabidopsis and an additional whole-genome triplication(WGT)event shared with other Brassica species.The present cultivated cauliflower diverged from the ancestral B.oleracea species~3.0 million years ago(Mya).The speciation of cauliflower(~2.0 Mya)was later than that of B.oleracea L.var.capitata(approximately 2.6 Mya)and other Brassica species(over 2.0 Mya).Chromosome no.03 of cauliflower shared the most syntenic blocks with the A,B,and C genomes of Brassica species and its eight other chromosomes,implying that chromosome no.03 might be the most ancient one in the cauliflower genome,which was consistent with the chromosome being inherited from the common ancestor of Brassica species.In addition,2,718 specific genes,228 expanded genes,2 contracted genes,and 1,065 positively selected genes in cauliflower were identified and functionally annotated.These findings provide new insights into the genomic diversity of Brassica species and serve as a valuable reference for molecular breeding of cauliflower. 关键词：species CAULIFLOWER SEQUENCE

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Draft genome sequence of cauliflower(Brassica oleracea L.var.botrytis)provides new insights into the C genome in Brassica species

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