Genomic analysis of isopentenyltransferase genes and functional characterization of TaIPT8 indicates positive effects of cytokinins on drought tolerance in wheat

文献类型： 外文期刊

第一作者： Wang, Na

作者： Wang, Na;Fang, Zhengwu;Chen, Jun;Gao, Yuan;Zhou, Yongbin;Chen, Ming;Xu, Zhaoshi;Ma, Youzhi

作者机构：

关键词： TaIPT; Phytohormone; Abiotic stress; Cytokinin biosynthesis; Wheat

期刊名称：CROP JOURNAL （ 影响因子：6.6； 五年影响因子：6.5 ）

ISSN： 2095-5421

年卷期： 2023 年 11 卷 1 期

页码：

收录情况： SCI

摘要： Cytokinins (CKs) function in plant development and during stress responses, but their role in drought tol-erance in wheat is unknown. In the present study, 24 isopentenyltransferase (IPT) genes, encoding rate-limiting enzymes in CK biosynthesis were identified in the wheat genome. The chromosomal locations and structures of the genes, protein properties, and phylogenetic relationships were characterized. ATP/ADP TaIPT genes showed tissue-specific expression. TaIPT2, TaIPT7, and TaIPT8 expression was rapidly induced by 0.5-1 h drought treatments, which decreased to low levels after 2 h drought treat-ment, as did most other TaIPT genes. TaIPT8-5a/5b/5d triple mutants showed decreased levels of tZ-type CK under normal and drought conditions and reduced drought tolerance, which, however, did not manifest as phenotype alterations. By contrast, transgenic wheat plants with drought-induced TaIPT8 showed increased drought tolerance. Our study provides a foundation for further investigation of TaIPT genes and novel insights into the role of CKs in the drought response of wheat.(c) 2022 Crop Science Society of China and Institute of Crop Science, CAAS. Production and hosting by Elsevier B.V. on behalf of KeAi Communications Co., Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

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