Genome-Wide Identification of the <i>StPYL</i> Gene Family and Analysis of the Functional Role of <i>StPYL9a-like</i> in Salt Tolerance in Potato (<i>Solanum tuberosum</i> L.)
Chunna Lv | Yuting Bao | Minghao Xu | Ke Deng | Long Zhao | Yihan Zhao | Yifan Zhou | Yuejuan Feng | Fang Wang
PYR/PYL (pyrroloquinoline quinone resistance/PYR1-like) are receptors for abscisic acid (ABA) in plants and play a crucial role in responses to abiotic stress. In this study, we identified 63 members of the StPYL gene family at the tetraploid whole-genome level in potatoes. We analyzed the physicochemical properties of these 63 StPYLs and constructed a phylogenetic tree using <i>Arabidopsis thaliana</i> and potato (<i>Solanum tuberosum</i> L.) cultivar ‘DM’ as the reference. By examining gene structure, conserved protein motifs, and collinearity, we found that StPYLs are highly conserved throughout evolution. The gene expression heat map under salt stress revealed that 57 StPYL genes are involved in the salt stress response. Among them, the expression level of <i>StPYL9a-like</i> changed significantly under salt stress. Through genetic transformation, we observed that overexpression of <i>StPYL9a-like</i> enhanced the growth and survival of potato plants under salt stress compared to the wild type. The contents of proline (Pro), superoxide dismutase (SOD), and chlorophyll in the leaves of overexpressing plants increased, while malondialdehyde (MDA) levels decreased. This suggests that <i>StPYL9a-like</i> positively regulates salt tolerance by affecting antioxidant enzyme activity and osmotic adjustment substances in potatoes. Subcellular localization demonstrated that <i>StPYL9a-like</i> is localized in the nucleus. This study provides a reference for the functional research of PYLs in potatoes, offers a basis for screening potato genes related to salt stress, and lays a foundation for developing salt-tolerant potato varieties.
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