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Controlling diurnal flower-opening time by manipulating the jasmonate pathway accelerates development of indica-japonica hybrid rice breeding

文献类型： 外文期刊

作者： Wang, Mumei 1 ; Zhu, Xiaopei 1 ; Huang, Zhen 1 ; Chen, Minghao 1 ; Xu, Peng 1 ; Liao, Shitang 1 ; Zhao, Yongzhen 1 ; Gao, Yannan 1 ; He, Jiahui 1 ; Luo, Yutong 1 ; Chen, Huixuan 1 ; Wei, Xiaoying 1 ; Nie, Shuai 3 ; Dong, Jingfang 3 ; Zhu, Liya 1 ; Zhuang, Chuxiong 1 ; Zhao, Junliang 3 ; Liu, Zhenlan 1 ; Zhou, Hai 1 ;

作者机构： 1.South China Agr Univ, Coll Life Sci, State Key Lab Conservat & Utilizat Subtrop Agrobio, Guangdong Lab Lingnan Modern Agr,Key Lab Enhancing, Guangzhou, Peoples R China

2.Shaoguan Univ, Guangdong Prov Key Lab Utilizat & Conservat Food &, Shaoguan, Peoples R China

3.Guangdong Acad Agr Sci, Rice Res Inst, Guangzhou, Peoples R China

4.Guangdong Key Lab New Technol Rice Breeding, Guangzhou, Peoples R China

5.Guangdong Rice Engn Lab, Guangzhou, Peoples R China

关键词： rice; hybrid breeding; yield of hybrid seed production; diurnal flower-opening time; jasmonate

期刊名称：PLANT BIOTECHNOLOGY JOURNAL （ 影响因子：13.8； 五年影响因子：13.2 ）

ISSN： 1467-7644

年卷期： 2024 年

页码：

收录情况： SCI

摘要： Inter-subspecific indica-japonica hybrid rice (Oryza sativa) has the potential for increased yields over traditional indica intra-subspecies hybrid rice, but limited yield of F-1 hybrid seed production (FHSP) hinders the development of indica-japonica hybrid rice breeding. Diurnal flower-opening time (DFOT) divergence between indica and japonica rice has been a major contributing factor to this issue, but few DFOT genes have been cloned. Here, we found that manipulating the expression of jasmonate (JA) pathway genes can effectively modulate DFOT to improve the yield of FHSP in rice. Treating japonica cultivar Zhonghua 11 (ZH11) with methyl jasmonate (MeJA) substantially advanced DFOT. Furthermore, overexpressing the JA biosynthesis gene OPDA REDUCTASE 7 (OsOPR7) and knocking out the JA inactivation gene CHILLING TOLERANCE 1 (OsHAN1) in ZH11 advanced DFOT by 1- and 2-h respectively; and knockout of the JA signal suppressor genes JASMONATE ZIM-DOMAIN PROTEIN 7 (OsJAZ7) and OsJAZ9 resulted in 50-min and 1.5-h earlier DFOT respectively. The yields of FHSP using japonica male-sterile lines GAZS with manipulated JA pathway genes were significantly higher than that of GAZS wildtype. Transcriptome analysis, cytological observations, measurements of elastic modulus and determination of cell wall components indicated that the JA pathway could affect the loosening of the lodicule cell walls by regulating their composition through controlling sugar metabolism, which in turn influences DFOT. This research has vital implications for breeding japonica rice cultivars with early DFOT to facilitate indica-japonica hybrid rice breeding.

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