数字农科院2.0

Extensin-like Protein OsPEX1 Modulates Grain Filling in Rice

文献类型： 外文期刊

作者： Na Liu;Jieni Li;Cong Cong Wang;Tingting Yang;Ao Li;Peng Zeng;Haifeng Peng;Yuexiong Zhang;Dahui Huang;Xia Zheng;Xiang Qian Zhang

作者机构：

关键词： endoplasmic reticulum;extensin;grain filling;rice

期刊名称： Plants

ISSN： 2223-7747

年卷期： 2025 年 14 卷 17 期

页码：

收录情况： SCIE（2025版）

摘要： Grain filling is a vital factor influencing both rice grain yield and quality, yet its underlying mechanisms remain poorly understood. In this study, we perform a functional analysis of the grain-filling defective mutant pex1 in rice. pex1 plants produce seeds that are floury, thick-branched, and exhibit a significantly slower grain-filling rate compared to the wild type. Further analysis reveals that the pex1 mutants accumulated more starch in the pericarp but exhibited a defect in starch accumulation in the endosperm during grain filling, indicating an impaired transport of photosynthetic products from the pericarp to the endosperm. Cells within the nucellar projection in the pex1 mutant appear irregular and loose loosely arranged, consistent with defective transfer of assimilates. Expression analysis reveals a downregulation of key grain-filling genes during the filling phase in the pex1 mutant compared to the wild type, which correlates with the reduced grain-filling rate. Subcellular localization suggests that OsPEX1 is associated with the endoplasmic reticulum. Our findings demonstrate that OsPEX1 plays a crucial role in grain filling.

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