滞绿基因SGR研究进展OA

The STAY-GREEN(SGR)gene family is a key regulator of chlorophyll degradation and leaf senescence in plants.This study,through systematic phylogenetic analysis,demonstrated that the SGR gene family can be divided into two functionally divergent subfamilies,SGR and SGRL.The number of family members varied among species,yet the protein structure was highly conserved.Functional studies revealed that SGR not only played a central role in plant growth and development by regulating chlorophyll degradation but also extensively participated in responses to abiotic and biotic stresses,often in a gene-specific manner.At the molecular level,SGR gene served as a hub integrating multiple hormone signals,including abscisic acid,ethylene,and jasmonic acid,and coordinated chlorophyll degradation and stress responses by modulating the homeostasis of reactive oxygen species and phenylpropane metabolism pathways.This article reviewed the complex regulatory network mediated by SGR gene,providing important theoretical foundations and research directions for elucidating its molecular mechanisms and for targeted improvement of crop stress resistance and agricultural product quality using gene-editing technologies.