数字农科院2.0

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

作者： Wang N.; Chen J.; Gao Y.; Zhou Y.; Chen M.; Xu Z.; Fang Z.; Ma Y.

作者机构：

期刊名称： Crop Journal

ISSN： 2095-5421

年卷期： 2022 年

页码：

收录情况： SCIE（2022版） ; CSCD（2021-2022年度） ; 科技核心（2021版） ; 农林核心（2020版）

摘要： Cytokinins (CKs) function in plant development and during stress responses, but their role in drought tolerance 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 treatment, 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. © 2022

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