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Genome-wide Association Analyses Reveal the Genetic Basis of stigma exsertion in Rice

Molecular Plant 2017年第4期10卷 634-644页

作者： Hao Zhou Pingbo Li WeiboXie Saddam Hussain Yibo Li Duo Xia Hu Zhao Shengyuan Sun Junxiao Chen Hong Ye Jun Hou Da Zhao Guanjun Gao Qinglu Zhang Gongwei Wang Xingming Lian Jinghua Xiao Sibin Yu Xianghua Li Yuqing He National Key Laboratory of Crop Genetic Improvement and National Centre of Plant Gene Research (Wuhan) Huazhong Agricultural University Wuhan 430070China

stigma exsertion, a key determinant of the rice mating system, greatly contributes to the application of heterosis in rice. Although a few quantitative trait loci associated with stigma exsertion have been fine map- ped or cloned, the underlying genetic architecture remains unclear. We performed a genome-wide associ- ation study on stigma exsertion and related floral traits using 6.5 million SNPs characterized in 533 diverse accessions of Oryza sativa. We identified 23 genomic loci that are significantly associated with stigma exsertion and related traits, three of which are co-localized with three major grain size genes GS3, GW5, and GW2. Further analyses indicated that these three genes affected the stigma exsertion by controlling the size and shape of the spikelet and stigma. Combinations of GS3 and GW5 largely defined the levels of stigma exsertion and related traits. Selections of these two genes resulted in specific distributions of floral traits among subpopulations of O. sativa. The low stigma exsertion combination gw5GS3 existed in half of the cultivated rice varieties; therefore, introducing the GW5gs3 combination into male sterile lines is of high potential for improving the seed production of hybrid rice.

关键词： stigma exsertion GWAS hybrid seed production floral traits grain shape rice

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Fine Mapping of QTLs for stigma exsertion Rate from Oryza glaberrima by Chromosome Segment Substitution

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Rice science 2022年第1期29卷 55-66,I0024页

作者： TAN Quanya ZHU Haitao LIU Hui NI Yuerong WU Shengze LUAN Xin LIU Junwei YANG Weifeng YANG Zifeng ZENG Ruizhen LIU Guifu WANG Shaokui ZHANG Guiquan Guangdong Provincial Key Laboratory of Plant Molecular Breeding/State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources South China Agricultural UniversityGuangzhou 510642China

stigma exsertion is an important trait for outcrossing ability in *** exsertion rate(SER)of male sterile lines(MSLs)is a key factor affecting F1-seed production in hybrid *** this study,seven QTLs for SER were detected on five chromosomes using a set of single-segment substitution lines(SSSLs)derived from *** of the QTLs were mapped in the estimated intervals of 92.5–333.0 ***-5 was located in a substitution segment of 92.5 *** ER-1 b and qS ER-8 b were respectively limited to 333.0 kb and 107.5 kb by secondary substitution ***-1 b and qSER-3 had bigger additive effects of 11.5%and 11.9%,respectively,while the other five QTLs had smaller additive effects from 5.7%to 8.6%.Open reading frames were identified in the regions of qS ER-5 and qSER-8 b in *** and *** *** mapping of the QTLs laid a foundation for the cloning of genes,and QTLs for SER will be used to develop MSLs with strong ability of outcrossing.

关键词： stigma exsertion QTL single-segment substitution line substitution mapping Oryza glaberrima

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Genetic Improvement and Biological Characteristic Analysis of Dwarf Abortive TypeJaponicaCMS Lines with Wide Compatibility

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Agricultural Science & Technology 2011年第7期12卷 980-984,996页

作者： SONG Xin-wei LIN Jian-rong WU Ming-guo State Key Laboratory of Rice Biology China National Rice Research Institute Hangzhou 310006

From the view of methodology for genetic improvement ofJaponicacytoplasmic male sterile(CMS) lines,we introduced the breeding process of the dwarf-abortive type(DA type)JaponicaCMS line Chunjiang 95A with wide compatibility,and further investigated the biological characteristics of the DA type Chunjiang 95A and its isonuclear alloplasmic CMS line Dian-I type Chunjiang *** results show that DA type Chunjiang 95A is a japonicalinous CMS line and mainly typical abortive,which is better in fertility stability than stained abortive typeJaponica CMS *** DA type Chunjiang 95A is featured with high stigma exsertion,good flowering habit,high outcrossing rate and wide *** recoverability differs from stained abortive typeJaponicaCMS ***,we discussed genetic improvement of the typical abortive type JaponicaCMS lines and the application prospects of heterosis.

关键词： Wide compatibility Japonica rice CMS line stigma exsertion Breeding

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