Cotton microtubule-associated protein GhMAP20L5 mediates fiber elongation through the interaction with the tubulin GhTUB13

文献类型： 外文期刊

第一作者： Song, Qingwei

作者： Song, Qingwei;Gao, Wanting;Du, Chuanhui;Zuo, Kaijing;Wang, Jin

作者机构：

关键词： Cotton; Fiber elongation; GhMAP20L5; Microtubules (MTs); Tubulin

期刊名称：PLANT SCIENCE （ 影响因子：5.2； 五年影响因子：5.7 ）

ISSN： 0168-9452

年卷期： 2023 年 327 卷

页码：

收录情况： SCI

摘要： Targeting proteins for Xklp2 (TPX2s) comprise a class of MAPs that are essential for plant growth and devel-opment by regulating the dynamic changes of microtubules (MTs) and proper formation of cytoskeleton. However, the function of TPX2 proteins in cotton fiber development remains poorly understood. Here, we identified the function of a fiber elongation-specific TPX2 protein, GhMAP20L5, in cotton. Suppressed GhMAP20L5 gene expression in cotton (GhMAP20L5i) significantly reduced fiber elongation rate, fiber length and lint percentage. GhMAP20L5i fibers had thinner and looser secondary cell walls (SCW), and incompact helix twists. GhMAP20L5 specifically interacted with the tubulin GhTUB13 on the cytoskeleton. Gene coexpression analysis showed that GhMAP20L5 involved in multiple pathways related to cytoskeleton establishment and fiber cell wall formation and affected cellulase genes expressions. In summary, our results revealed that GhMAP20L5 is important for fiber development by regulating cytoskeleton establishment and the cellulose deposition in cotton.

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