The auxin transporter OsAUX1 regulates tillering in rice (Oryza sativa)

文献类型： 外文期刊

第一作者： Jia, Luqi

作者： Jia, Luqi;Dai, Yongdong;Peng, Ziwei;Cui, Zhibo;Zhang, Xuefei;Li, Yangyang;Tian, Weijiang;He, Guanghua;Sang, Xianchun;Li, Yun

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关键词： rice ( Oryza sativa L.); tillering; indole-3-acetic acid (IAA); OsAUX1; OsTB1

期刊名称：JOURNAL OF INTEGRATIVE AGRICULTURE （ 影响因子：4.8； 五年影响因子：4.8 ）

ISSN： 2095-3119

年卷期： 2024 年 23 卷 5 期

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收录情况： SCI

摘要： Tillering is an important agronomic trait of rice ( Oryza sativa ) that affects the number of effective panicles, thereby affecting yields. The phytohormone auxin plays a key role in tillering. Here we identified the high tillering and semidwarf 1 ( htsd1 ) mutant with auxin -deficiency root characteristics, such as shortened lateral roots, reduced lateral root density, and enlarged root angles. htsd1 showed reduced sensitivity to auxin, but the external application of indole-3-acetic acid (IAA) inhibited its tillering. We identified the mutated gene in htsd1 as AUXIN1 ( OsAUX1 , LOC_Os01g63770), which encodes an auxin influx transporter. The promoter sequence of OsAUX1 contains many SQUAMOSA PROMOTER BINDING PROTEIN -LIKE (SPL) binding sites, and we demonstrated that SPL7 binds to the OsAUX1 promoter. TEOSINTE BRANCHED1 ( OsTB1 ), a key gene that negatively regulates tillering, was significantly downregulated in htsd1 . Tillering was enhanced in the OsTB1 knockout mutant, and the external application of IAA inhibited tiller elongation in this mutant. Overexpressing OsTB1 restored the multi -tiller phenotype of htsd1 . These results suggest that SPL7 directly binds to the OsAUX1 promoter and regulates tillering in rice by altering OsTB1 expression to modulate auxin signaling.

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