SbPIP2 Mediated Improvements in Plant Resilience: Physiological and Molecular Insights into Abiotic Stress Response

Abstract

Understanding the mechanisms behind plant resilience to abiotic stresses is essential for enhancing crop yield and sustainability. This study integrates findings from a comprehensive investigation into the function of the SbPIP2 gene, which encodes an aquaporin protein, in improving the abiotic stress tolerance of transgenic plants. Our integrated approach revealed that transgenic plants overexpressing SbPIP2 significantly reduce reactive oxygen species (ROS) accumulation and exhibit enhanced physiological attributes, including higher seed germination rates, improved growth, early flowering, and better seed setting under stress conditions. Notably, these plants also showed a quicker recovery and completion of their lifecycle post-stress treatment. The transcriptomic analysis provided a deeper understanding of the genetic modifications contributing to stress resilience, highlighting the involvement of genes associated with oxidative stress response, calcium and sugar signaling pathways, stomatal regulation, phytohormone biosynthesis, and flower development. Additionally, the study underscores the central role of abscisic acid (ABA) in mediating stress responses through hormonal regulation, with transgenic plants displaying increased ABA levels due to the upregulation of biosynthesis genes and downregulation of catabolism genes. This hormonal adjustment is critical for stomatal closure, reducing water loss, and enhancing tolerance to abiotic stresses. Our findings elucidate the complex genetic and molecular pathways that underpin abiotic stress tolerance in plants, offering valuable insights for future research aimed at improving crop resilience through genetic engineering, thereby addressing the challenges of climate change and environmental stressors.