AUTHOR=Li Gengmi , Zhang Tao , Yang Li , Qin Jian , Yang Qianhua , Cao Yingjiang , Luo Jing , Li Xiangzhao , Gao Lei , Chen Qian , He Xingping , Huang Yong , Liu Chuantao , He Ling , Zheng Jiakui , Jiang Kaifeng 

TITLE=Sterile line Dexiang074A enhances drought tolerance in hybrid rice

JOURNAL=Frontiers in Plant Science

VOLUME=Volume 14 - 2023

YEAR=2023

URL=https://www.frontiersin.org/journals/plant-science/articles/10.3389/fpls.2023.1054571

DOI=10.3389/fpls.2023.1054571

ISSN=1664-462X

ABSTRACT=Changes in Fv/Fm and protection provided by antioxidant enzymes and osmoregulation of sugars are the main ways plants exhibit resistance to abiotic stress. Drought stress is one of the main limiting factors of rice growth and development. It is an increasingly serious threat to crop yield. It is essential to improve the stress resistance of rice plants and cultivate drought-tolerant varieties. In this study, Dexiang074B (074B) and Dexiang074A (074A) served as maintainer lines and sterile lines. Mianhui146 (R146), Chenghui727 (R727), LuhuiH103 (RH103), Dehui8258 (R8258), Huazhen (HZ), Dehui938 (R938), Dehui4923 (R4923), and R1391 served as restorer lines. The progeny were Dexiangyou (D146), Deyou4727 (D4727), Dexiang 4103 (D4103), Deyou8258 (D8258), Deyou Huazhen (DH), Deyou 4938 (D4938), Deyou 4923 (D4923), and Deyou 1391 (D1391). The restorer line and hybrid offspring were subjected to drought stress. The restorer line and hybrid offspring were subjected to drought stress at the flowering stage. The results showed that Fv/Fm values were abnormal and oxidoreductase activity and MDA content were increased. However, the performance of hybrid progeny was significantly better than their respective restorer lines. Although the yield of hybrid progeny and restorer lines decreased simultaneously, the yield in hybrid offspring is significantly lower than the respective restorer line. Total soluble sugar content was consistent with the yield result, so we found that 074A can enhance drought tolerance in hybrid rice.