Grain shape is a factor affecting the stigma exsertion rate in rice

Frontiers in Plant Science

Plant Science

Yuanyuan Ba¹  Zhenguang Yan¹  Zupei Liu¹  Guodong Chen¹  Songliang Chen¹  Qimiao Lu¹  Guiquan Zhang¹  Haitao Zhu¹  Zhenpeng Gan¹  Quanya Tan¹  Suhong Bu¹  Weifeng Yang¹  Shaokui Wang¹  Jiao Zhao¹  Guifu Liu¹  Shaojun Lin¹ 

[1] Guangdong Provincial Key Laboratory of Plant Molecular Breeding, State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, South China Agricultural University, Guangzhou, China;Guangdong Laboratory for Lingnan Modern Agriculture, South China Agricultural University, Guangzhou, China;

关键词: grain shape;    stigma shape;    stigma exsertion;    pleiotropic effect;    outcrossing ability;    rice;   

DOI  :  10.3389/fpls.2023.1087285

 received in 2022-11-02, accepted in 2023-01-16,  发布年份 2023

来源: Frontiers

【 摘 要 】

Stigma exsertion rate (SER) is an index of outcrossing ability in rice and is a key trait of male sterile lines (MSLs) in hybrid rice. In this study, it was found that the maintainer lines carrying gs3 and gs3/gw8 showed higher SER. Single-segment substitution lines (SSSLs) carrying gs3, gw5, GW7 or gw8 genes for grain shape and gene pyramiding lines were used to reveal the relationship between grain shape and SER. The results showed that the grain shape regulatory genes had pleiotropic effects on SER. The SERs were affected by grain shapes including grain length, grain width and the ratio of length to width (RLW) not only in low SER background, but also in high SER background. The coefficients of determination (R2) between grain length and SER, grain width and SER, and grain RLW and SER were 0.78, 0.72, and 0.91 respectively. The grain RLW was the most important parameter affecting SER, and a larger grain RLW was beneficial to stigma exsertion. The pyramiding line PL-gs3/GW7/gw8 showed the largest grain RLW and the highest SER, which will be a fine breeding resource. Further research showed that the grain shape regulatory genes had pleiotropic effects on stigma shape, although the R2 values between grain shape and stigma shape, and stigma shape and SER were lower. Our results demonstrate that grain shape is a factor affecting SER in rice, in part by affecting stigma shape. This finding will be helpful for breeding MSLs with high SER in hybrid rice.

【 授权许可】

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Copyright © 2023 Tan, Chen, Gan, Lu, Yan, Chen, Lin, Yang, Zhao, Ba, Zhu, Bu, Liu, Liu, Wang and Zhang