A genome-wide identification and expression analysis of the class III peroxidase gene family in <i>Mangifera indica</i> under abiotic stresses and the <i>MiPRX27</i> gene regulates oxidative stress

Class III peroxidases (PRXs) are plant-specific enzymes that play vital roles in various physiological processes. However, the functional roles of mango <i>PRXs</i> under stress conditions remain poorly understood. In this study, we identified 76 <i>MiPRX</i> genes, which are unevenly distributed across the mango chromosomes. RT-qPCR analysis revealed differential expression of most <i>MiPRX</i> genes under oxidative, drought, and salt stress conditions, with <i>MiPRX27</i> showing a particularly prominent role. Under oxidative stress, heterologous overexpression of <i>MiPRX27</i> in <i>Arabidopsis</i> enhanced lateral root formation and accelerated root growth, suggesting that <i>MiPRX27</i> contributes to reducing plant sensitivity to oxidative stress. Overall, this study provides a theoretical foundation for further exploration of <i>MiPRX</i>-mediated mechanisms underlying mango stress tolerance.