PJB-2021-536
Overexpression of a sour jujube gene ZjPYL8, encoding a putative Abscisic Acid receptor, increases sensitivity of stomata and roots to ABA in Arabidopsis thaliana
lanting Qi
Abstract
The plant hormone abscisic acid (ABA) is a key regulator in regulating plant growth, development, and stress adaptation. The growth of sour jujube (Ziziphus jujuba Mill. var. spinosa (Bunge) Hu ex H. Chou, known as Suanzao in Chinese) is closely related to environmental factors, especially drought stress and salt stress. Here, we cloned and overexpressed ZjPYL8 in Arabidopsis thaliana (A. thaliana) and investigated the effect of the overexpression of ZjPYL8 in plants responding to ABA. Overexpression of ZjPYL8 in A. thaliana resulted in significantly reducing aperture size of stomata and root length under ABA treatment, while the wild type (WT) was more insensitive to ABA. Furthermore, ZjPYL8 transgenic plants showed a shorter root length under salt treatment than WT did. Based on the results above, we speculate that the overexpression of ZjPYL8 in A. thaliana could effectively enhance the resistant of plants to stress and further suggest that ZjPYL8 as a putative ABA receptor in sour jujube could enhance the adaptability of plants to drought and salt stresses. ZjPYL8, like most ABA receptors in A. thaliana, is involved in mediating plant responses to ABA, such as stomatal closure and root length.
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