High temperature inhibits the accumulation of storage materials by inducing alternative splicing of OsbZIP58 during filling stage in rice

文献类型： 外文期刊

第一作者： Xu, Heng

作者： Xu, Heng;Zhang, Hua;Wang, Liangchao;Zhu, Ying;Li, Xiaofang;Zhu, Zhengge;Gao, Jiping;Li, Chunshou

作者机构：

关键词： alternative splicing; grain quality; high temperature; OsbZIP58; rice; storage materials accumulation

期刊名称：PLANT CELL AND ENVIRONMENT （ 影响因子：7.228； 五年影响因子：7.791 ）

ISSN： 0140-7791

年卷期： 2020 年 43 卷 8 期

页码：

收录情况： SCI

摘要： High temperature (HT) has an adverse effect on rice grain filling by inhibiting the accumulation of storage materials. However, the regulatory mechanism of this inhibition remains unknown. Here, we report that Opaque2 like transcription factor OsbZIP58 is a key factor regulating storage material accumulation under HT. The OsbZIP58 gene promotes expression of many seed storage protein genes and starch synthesis genes while inhibits expression of some starch hydrolyzing alpha-amylase genes under HT. The loss of OsbZIP58 function leads to floury and shrunken endosperms and dramatically reduced storage materials in the seeds under HT. HT is found to affect alternative splicing of OsbZIP58, promoting the formation of the truncated OsbZIP58 beta protein form over the full-length OsbZIP58 alpha protein form. The OsbZIP58 beta form has a lower transcriptional activity than the OsbZIP58 alpha form, especially under HT condition. Interestingly, rice varieties with less heat sensitivity have reduced alternative splicing of OsbZIP58. Therefore, OsbZIP58 is a crucial gene in regulating storage material accumulation under HT and lower alternative splicing of OsbZIP58 may contribute to heat tolerance during grain filling. High temperature (HT) can harm rice grain quality by significantly reducing the storage materials accumulation. Here we found the alternative splicing of OsbZIP58 can be induced by HT and the lower activity of OsbZIP58 beta encoded by alternative spliced transcript might account for the decrease of storage materials accumulation and seed quality control in rice under HT.

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