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Increased expression of OsSAUR23 and OsRR9 regulates rice plant and organ size

文献类型： 外文期刊

作者： Huang, Suhua 1 ; Zhou, Baoyuan 1 ; Gao, Zhuohan 1 ; Li, Hao 1 ; Ding, Zaisong 1 ;

作者机构： 1.Chinese Acad Agr Sci, Inst Crop Sci, Beijing 100081, Peoples R China

关键词： Rice; Grain size; Auxin; Cytokinin

期刊名称：CROP JOURNAL （ 影响因子：5.6； 五年影响因子：6.0 ）

ISSN： 2095-5421

年卷期： 2025 年 13 卷 2 期

页码：

收录情况： SCI

摘要： Plant height and grain size are the most important factors determining rice yield. Here, in the rice mutant small plant and organ size1 (spos1) with reduced plant height and small grain, T-DNA insertion revealed that the mutant phenotype was caused by increased expression of of OsSAUR23 and OsRR9, which participate in auxin and cytokinin signal transduction, respectively. Knock out of OsSAUR23 increased rice grain size but did not change plant height. Double knock out of OsRR9 and its replicated gene OsRR10 also brought similar effects on rice as that of OsSAUR23 knock-out. Genetic analysis suggested that OsSAUR23 was a major recessive gene and OsRR9 was a minor dominant gene, which co-regulated the phenotype of spos1. Compared with wild type, auxin synthesis and signaling, cytokinin homeostasis and signaling, as well as GA, ABA and BR metabolism and signaling were regulated in seedlings of spos1. The increased concentrations of IAA and cytokinins in the mutant suggest hormonal co-regulation of rice organ size. (c) 2025 Crop Science Society of China and Institute of Crop Science, CAAS. Production and hosting by Elsevier B.V. on behalf of KeAi Communications Co., Ltd. This is an open access article under the CC BY-NCND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

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