Light-stabilized GIL1 suppresses PIN3 activity to inhibit hypocotyl gravitropism

IF 9.3 1区 生物学 Q1 BIOCHEMISTRY & MOLECULAR BIOLOGY Journal of Integrative Plant Biology Pub Date : 2024-07-11 DOI:10.1111/jipb.13736
Xiaolian Wang, Yanfang Yuan, Laurence Charrier, Zhaoguo Deng, Markus Geisler, Xing Wang Deng, Haodong Chen
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Abstract

Light and gravity coordinately regulate the directional growth of plants. Arabidopsis Gravitropic in the Light 1 (GIL1) inhibits the negative gravitropism of hypocotyls in red and far-red light, but the underlying molecular mechanisms remain elusive. Our study found that GIL1 is a plasma membrane-localized protein. In endodermal cells of the upper part of hypocotyls, GIL1 controls the negative gravitropism of hypocotyls. GIL1 directly interacts with PIN3 and inhibits the auxin transport activity of PIN3. Mutation of PIN3 suppresses the abnormal gravitropic response of gil1 mutant. The GIL1 protein is unstable in darkness but it is stabilized by red and far-red light. Together, our data suggest that light-stabilized GIL1 inhibits the negative gravitropism of hypocotyls by suppressing the activity of the auxin transporter PIN3, thereby enhancing the emergence of young seedlings from the soil.

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光稳定的 GIL1 可抑制 PIN3 的活性,从而抑制下胚轴的向心力。
光和重力协调调节植物的定向生长。拟南芥光下引力1(GIL1)能抑制下胚轴在红光和远红光下的负向引力,但其潜在的分子机制仍然难以捉摸。我们的研究发现,GIL1 是一种质膜定位蛋白。在下胚轴上部的内皮细胞中,GIL1 控制着下胚轴的负向引力。GIL1 直接与 PIN3 相互作用,抑制 PIN3 的植物生长素转运活性。突变 PIN3 可抑制 gil1 突变体的异常引力反应。GIL1 蛋白在黑暗条件下不稳定,但在红光和远红光下稳定。我们的数据表明,光稳定的 GIL1 通过抑制辅素转运体 PIN3 的活性来抑制下胚轴的负向引力,从而提高幼苗的出土率。
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来源期刊
Journal of Integrative Plant Biology
Journal of Integrative Plant Biology 生物-生化与分子生物学
CiteScore
18.00
自引率
5.30%
发文量
220
审稿时长
3 months
期刊介绍: Journal of Integrative Plant Biology is a leading academic journal reporting on the latest discoveries in plant biology.Enjoy the latest news and developments in the field, understand new and improved methods and research tools, and explore basic biological questions through reproducible experimental design, using genetic, biochemical, cell and molecular biological methods, and statistical analyses.
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