Segmental Translocation Contributed to the Origin of the Brassica S-locus  

作　　者：Yinan Cui Mu Zhuang Jian Wu Jisheng Liu Yiyue Zhang Lingkui Zhang Yile Huang Xu Cai Jianli Liang Kang Zhang Xiaowu Wang Feng Cheng 

机构地区：[1]Institute of Vegetables and Flowers,Chinese Academy of Agricultural Sciences,Key Laboratory of Biology and Genetic Improvement of Horticultural Crops of the Ministry of Agriculture,Sino-Dutch Joint Laboratory of Horticultural Genomics,Beijing 100081,China

出　　处：《Horticultural Plant Journal》2020年第3期167-178,共12页园艺学报（英文版）

基　　金：supported by the National Key Research and Development Program of China (Grant No. 2016YFD0100307 and 2018YFD1000800);the National Natural Science Foundation of China (Grant No. 31722048 and 31630068);the Science and Technology Innovation Program of the Chinese Academy of Agricultural Sciences;the Key Laboratory of Biology and Genetic Improvement of Horticultural Crops, Ministry of Agriculture, China

摘　　要：Self-incompatibility(SI),which has recurred during the evolution of plants,is one of the most important cross-pollination mating systems.Three S-loci have been reported in Brassicaceae,namely,Arabidopsis lyrata(Al),Brassica(Br),and Leavenworthia alabamica(La)S-loci.Here,through multi-genomic comparative analysis of 20 species,we revealed that the most ancient S-locus was formed prior to the divergence of Brassicaceae lineage I and II.Itwas retained and inherited by Arabidopsis,as the Al S-locus in Brassicaceae lineage I.Furthermore,we found that the Br S-locus,which has been widely used in the breeding of Brassica crops to generate hybrid seeds,was formed through segmental translocation(ST)in the hexaploid ancestor of Brassica in Brassicaceae lineage II.The Br S-locus was evolved through a ST from one of the triplicated ancestral S-locus paralogs in the Brassica hexaploidy ancestor,while the other two S-locus paralogs were lost.Together with the previous discovery that the La S-locus was formed through a secondary origin in Brassicaceae lineage I,we conclude the monophyletic origin of Al and Br S-loci and clarify the evolutionary route of S-loci in the Brassicaceae family.Our findings will contribute to evolutionary studies and breeding applications of the S-locus in Brassicaceae.

关 键 词：Self incompatibility SRK SCR Gene evolution Brassicaceae 

分 类 号：Q943[生物学—植物学]