Natural variation in PTB1 regulates rice seed setting rate by controlling pollen tube growth

Shuangcheng Li, Wenbo Li, Bin Huang, Xuemei Cao, Xingyu Zhou, Shumei Ye, Chengbo Li, Fengyan Gao, Ting Zou, Kailong Xie, Yun Ren, Peng Ai, Yangfan Tang, Xuemei Li, Qiming Deng, Shiquan Wang, Aiping Zheng, Jun Zhu, Huainian Liu, Lingxia Wang and Ping Li ()
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Shuangcheng Li: Rice Research Institute, Sichuan Agricultural University
Wenbo Li: Rice Research Institute, Sichuan Agricultural University
Bin Huang: Rice Research Institute, Sichuan Agricultural University
Xuemei Cao: Rice Research Institute, Sichuan Agricultural University
Xingyu Zhou: Rice Research Institute, Sichuan Agricultural University
Shumei Ye: Rice Research Institute, Sichuan Agricultural University
Chengbo Li: Rice Research Institute, Sichuan Agricultural University
Fengyan Gao: Rice Research Institute, Sichuan Agricultural University
Ting Zou: Rice Research Institute, Sichuan Agricultural University
Kailong Xie: Rice Research Institute, Sichuan Agricultural University
Yun Ren: Rice Research Institute, Sichuan Agricultural University
Peng Ai: Rice Research Institute, Sichuan Agricultural University
Yangfan Tang: Rice Research Institute, Sichuan Agricultural University
Xuemei Li: Rice Research Institute, Sichuan Agricultural University
Qiming Deng: Rice Research Institute, Sichuan Agricultural University
Shiquan Wang: Rice Research Institute, Sichuan Agricultural University
Aiping Zheng: Rice Research Institute, Sichuan Agricultural University
Jun Zhu: Rice Research Institute, Sichuan Agricultural University
Huainian Liu: Rice Research Institute, Sichuan Agricultural University
Lingxia Wang: Rice Research Institute, Sichuan Agricultural University
Ping Li: Rice Research Institute, Sichuan Agricultural University

Nature Communications, 2013, vol. 4, issue 1, 1-13

Abstract: Abstract Grain number, panicle seed setting rate, panicle number and grain weight are the most important components of rice grain yield. To date, several genes related to grain weight, grain number and panicle number have been described in rice. However, no genes regulating the panicle seed setting rate have been functionally characterized. Here we show that the domestication-related POLLEN TUBE BLOCKED 1 (PTB1), a RING-type E3 ubiquitin ligase, positively regulates the rice panicle seed setting rate by promoting pollen tube growth. The natural variation in expression of PTB1 which is affected by the promoter haplotype and the environmental temperature, correlates with the rice panicle seed setting rate. Our results support the hypothesis that PTB1 is an important maternal sporophytic factor of pollen tube growth and a key modulator of the rice panicle seed setting rate. This finding has implications for the improvement of rice yield.

Date: 2013
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DOI: 10.1038/ncomms3793

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