Unconventional splicing of wheat TabZIP60 confers heat tolerance in transgenic Arabidopsis

文献类型： 外文期刊

第一作者： Xiaoli Geng;;Xinshan Zang

作者： Xiaoli Geng;Xinshan Zang;Haoran Li;Zhenshan Liu;Aiju Zhao;Jian Liu;Huiru Peng;Yingyin Yao;Zhaorong Hu;Zhongfu Ni;Qixin Sun;Mingming Xin

作者机构：

关键词： Wheat; Heat stress; TabZIP60; Unconventional splicing

期刊名称：PLANT SCIENCE （ 影响因子：4.729； 五年影响因子：5.132 ）

ISSN： 0168-9452

年卷期： 2018 年 274 卷

页码：

收录情况： SCI

摘要： Conditions that disrupt protein folding, such as heat stress, can overwhelm the capacity of cells to fold proteins, thus causing endoplasmic reticulum (ER) stress. In Arabidopsis thaliana and other plants, inositol-requiring enzyme] mediated unconventional splicing of bZIP60 plays a crucial role in the heat and ER stress responses. However, little is known about this pathway in wheat (Triticum aestivum), especially its importance in heat tolerance. Here, we found that heat stress induced upregulation and unconventional splicing of TabZIP60 occurred in wheat seedlings. Constitutive expression of the spliced form of TabZIP60 (TabZIP60s) enhanced heat tolerance in Arabidopsis, but overexpression of the unspliced form (TabZIP60u) did not. RNA-sequencing analysis revealed ER stress related genes involved in heat responses in TabZIP60s-overexpression transgenic Arabidopsis. Chromatin immunoprecipitation-qPCR showed that TabZIP6Os directly binds to 17 target genes including AtbZIP60. Also, the 26S proteasome pathway post-translationally regulates TabZIP6Os levels during heat stress responses. Our findings suggest that unconventional splicing of TabZIP60 could contribute to heat tolerance in transgenic plants by modulating the expression of ER stress-related genes.

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