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A hybrid sterile locus leads to the linkage drag of interspecific hybrid progenies

文献类型： 外文期刊

作者： Wang, Mianmian 1 ; Yang, Jun 1 ; Wan, Jinpeng 1 ; Tao, Dayun 4 ; Zhou, Jiawu 4 ; Yu, Diqiu 1 ; Xu, Peng 1 ;

作者机构： 1.Chinese Acad Sci, Key Lab Trop Plant Resources & Sustainable Use, Xishuangbanna Trop Bot Garden, Kunming 650223, Yunnan, Peoples R China

2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China

3.Chinese Acad Sci, Ctr Econ Bot, Mengla 666303, Yunnan, Peoples R China

4.Yunnan Acad Agr Sci, Food Crops Res Inst, Yunnan Key Lab Rice Genet Improvement, Kunming 650200, Yunnan, Peoples R China

关键词： Interspecific hybridization; Linkage drag; Hybrid sterility; Segregation distortion

期刊名称：PLANT DIVERSITY （ 影响因子：2.528； ）

ISSN： 2096-2703

年卷期： 2020 年 42 卷 5 期

页码：

收录情况： SCI

摘要： Interspecific hybridization plays an important role in rice breeding by broadening access to desirable traits such as disease resistance and improving yields. However, interspecific hybridization is often hindered by hybrid sterility, linkage drag, and distorted segregation. To mine for favorable genes from Oryza glaberrima, we cultivated a series of BC4 introgression lines (ILs) of O. glaberrima in the japonica rice variety background (Dianjingyou 1) in which the IL-2769 (BC4F10) showed longer sterile lemmas, wider grains and spreading panicles compared with its receptor parent, suggesting that linkage drag may have occurred. Based on the BC5F2 population, a hybrid sterility locus, S20, a long sterile lemma locus, G1-g, and a new grain width quantitative trait locus (QTL), qGW7, were mapped in the linkage region about 15 centimorgan (cM) from the end of the short arm of chromosome 7. The hybrid sterility locus S20 from O. glaberrima eliminated male gametes of Oryza sativa, and male gametes carrying the alleles of O. sativa in the heterozygotes were aborted completely. In addition, the homozygotes presented a genotype of O. glaberrima, and homozygous O. sativa were not produced. Surprisingly, the linked traits G1-g and qGW7 showed similar segregation distortion. These results indicate that S20 was responsible for the linkage drag. As a large number of detected hybrid sterility loci are widely distributed on rice chromosomes, we suggest that hybrid sterility loci are the critical factors for the linkage drag in interspecific and subspecific hybridization of rice. Copyright (C) 2020 Kunming Institute of Botany, Chinese Academy of Sciences. Publishing services by Elsevier B.V. on behalf of KeAi Communications Co., Ltd.

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