近日，武汉大学胡骏及其小组的研究显示，生长素响应因子OsARF12通过影响植株向地性调节水稻叶片角度。2025年7月3日，国际知名学术期刊《遗传学报》发表了这一成果。

研究发现，水稻叶片节骨处高度表达的生长素反应因子基因OsARF12通过影响叶片向地性负向调节叶片角度。OsARF12过表达系的叶片角度更直立，而OsARF12突变体的叶片角度比野生型大。进一步研究表明，OsARF12通过与LPA1和LAZY1的启动子结合，直接激活它们的表达。OsARF12突变体表现为茎向地性受损，这一表型与LPA1或LAZY1突变体一致。综上所述，课题组研究人员阐明了OsARF12的生物学功能，它通过调节LPA1和LAZY1的表达水平，通过对茎向地性的影响来调节叶片角度。该研究揭示了生长素在水稻叶片角度决定中的作用，可能对作物结构的优化具有深远的影响。

据悉，叶角是影响作物结构和产量的关键农艺性状。植物激素，如生长素，在调节叶片角度中起关键作用；然而，潜在的分子机制仍有待充分阐明。

附：英文原文

Title: The auxin response factor OsARF12 modulates rice leaf angle via affecting shoot gravitropism

Author: Jun Hu (胡骏) a

Issue&Volume: 2025/07/03

Abstract: Leaf angle is a pivotal agronomic trait that significantly influences crop architecture and yield. Plant hormones, such as auxin, play a critical role in regulating leaf angle; however, the underlying molecular mechanisms remain to be fully elucidated. Here, we reveal that the auxin response factor gene, OsARF12, which is highly expressed in the leaf lamina joint, negatively regulates rice (Oryza sativa) leaf angle via affecting shoot gravitropism. Overexpression lines of OsARF12 exhibit more erect leaf angles, while the osarf12 mutants display enlarged leaf angles compared to the wild type. Further studies demonstrate that OsARF12 directly activates the expression of Loose Plant Architecture1 (LPA1) and LAZY1 by binding to their promoters. The osarf12 mutant presents impaired shoot gravitropism, a phenotype consistent with that of the lpa1 or lazy1 mutant. Collectively, we elucidate the biological functions of OsARF12, which modulates leaf angle through its impact on shoot gravitropism by regulating the expression levels of LPA1 and LAZY1. This study provides insight into the role of auxin in determining rice leaf angle, potentially holding profound effects for the optimization of crop architecture.

DOI: 10.1016/j.jgg.2025.06.005

Source: https://www.sciencedirect.com/science/article/abs/pii/S1673852725001924