Evaluation of drought tolerance in ZmVPP1-overexpressing transgenic inbred maize lines and their hybrids

文献类型： 外文期刊

第一作者： Jia Teng-jiao

作者： Jia Teng-jiao;Li Jing-jing;Wang Li-feng;Cao Yan-yong;Ma Juan;Wang Hao;Li Hui-yong;Zhang Deng-feng

作者机构：

关键词： inbred maize lines; drought stress; ZmVPP1; photosynthesis

期刊名称：JOURNAL OF INTEGRATIVE AGRICULTURE （ 影响因子：2.848； 五年影响因子：2.979 ）

ISSN： 2095-3119

年卷期： 2020 年 19 卷 9 期

页码：

收录情况： SCI

摘要： The vacuolar proton-pumping pyrophosphatase gene (VPP) is often used to enhance plant drought tolerance via genetic engineering. In this study, the drought tolerance of four transgenic inbred maize lines overexpressing ZmVPP1 (PH4CV-T, PH6WC-T, Chang7-2-T, and Zheng58-T) and their transgenic hybrids was evaluated at various stages. Under normal and drought conditions, the height and fresh weight were greater for the four transgenic inbred maize lines than for the wild-type (WT) controls at the germination and seedling stages. Additionally, the transgenic plants exhibited enhanced photosynthetic efficiency at the seedling stage. In irrigated and non-irrigated fields, the four transgenic lines grew normally, but with increased ear weight and yield compared with the WT plants. Moreover, the ear weight and yield of the transgenic hybrids resulting from the PH4CV-TxPH6WC-W and Chang7-2-TxZheng58-W crosses increased in the non-irrigated field. Our results demonstrated that the growth and drought tolerance of four transgenic inbred maize lines with improved photosynthesis were enhanced by the overexpression of ZmVPP1. Moreover, the Chang7-2 and PH4CV transgenic lines may be useful for future genetic improvements of maize hybrids to increase drought tolerance.

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