Plant Diversity ›› 2022, Vol. 44 ›› Issue (02): 213-221.DOI: 10.1016/j.pld.2021.05.002

• Articles • Previous Articles    

Identification and fine mapping of rtms1-D, a gene responsible for reverse thermosensitive genic male sterility from Diannong S-1X

Xiao Zhanga,b, Guimei Changa,b, Zihao Wua, Jinpeng Wana, Jun Yanga,b, Feijun Wanga,b, Fang Wanga, Diqiu Yua,c, Peng Xua,c,d   

  1. a CAS Key Laboratory of Tropical Plant Resources and Sustainable Use, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Menglun, Mengla, Yunnan 666303, China;
    b College of Life Sciences, University of Chinese Academy of Sciences, Beijing 100049, China;
    c Center of Economic Botany, Core Botanical Gardens, Chinese Academy of Sciences, Menglun, Mengla, Yunnan 666303, China;
    d The Innovative Academy of Seed Design, Chinese Academy of Sciences, Menglun, Mengla, Yunnan 666303, China
  • Received:2021-03-24 Revised:2021-05-19 Published:2022-04-24
  • Contact: Diqiu Yu,E-mail:ydq@xtbg.ac.cn;Peng Xu,E-mail:xupeng@xtbg.ac.cn
  • Supported by:
    The authors gratefully acknowledge the Crop protection and breeding base and Public Technology Service Center of the Xishuangbanna Tropical Botanical Garden of CAS for providing research base and facilities. This work was financially supported by Science and technology projects of Yunnan Province, China (Grant No. 202003AD150007), Strategic Leading Science and Technology Programme of Chinese Academy of Sciences (Grant Nos. XDA24030301 and XDA24040308), Natural Science Foundation of Yunnan, China (Grant No. 2018FA 023), and National Natural Science Foundation of China (Grant No. 31902110).

Abstract: Thermosensitive genic male sterility (TGMS) has been widely used in two-line hybrid rice breeding. Due to hybrid seed production being highly affected by changeable environments, its application scope is limited to some extent. Thus, it is of great importance to identify potential TGMS genes in specific rice varieties. Here, Diannong S-1 xuan (DNS-1X), a reverse TGMS (RTGMS) japonica male sterile line, was identified from Diannong S-1. Genetic analysis showed that male sterility was tightly controlled by a single recessive gene, which was supported by the phenotype of the F1 and F2:3 populations derived from the cross between DNS-1X and Yunjing 26 (YJ26). Combining simple sequence repeat (SSR) markers and bulked segregation analysis (BSA), we identified a 215 kb region on chromosome 10 as a candidate reverse TGMS region, which was designated as rtms1-D. It was narrower than the previously reported RTGMS genes rtms1 and tms6(t). The fertility conversion detected in the natural environment showed that DNS-1X was sterile below 28–30 ℃; otherwise, it was fertile. Histological analysis further indicated that the pollen abortion was occurred in the young microspore stage. This study will provide new resources for two-line hybrid rice and pave the way for molecular breeding of RTGMS lines.

Key words: Rice (Oryza sativa L.), Reverse thermosensitive genic male sterile (RTGMS), rtms1-D, Fertility transition