SGR — Sorghum bicolor

Summary

SORBI_3002G274800 (SGR, also known as NYE1) encodes a Staygreen family protein with multiple enzymatic activities including pheophytinase, 7-hydroxymethyl chlorophyll a reductase, chlorophyll b reductase, RCC reductase, polyamine oxidase, and pheophorbide a oxygenase activity. This sorghum gene on chromosome 2 is associated with chlorophyll cycle processes, chlorophyll a breakdown, polyamine breakdown, regulation of chlorophyll catabolism, photoprotection, nonphotochemical quenching, and PSII-associated light-harvesting complex II catabolism. It is associated with leaf yellowing tolerance, leaf senescence, chlorophyll content, photosynthetic rate, yield traits, disease tolerance, salt tolerance, drought tolerance, aluminum tolerance, abscisic acid sensitivity, cytokinin sensitivity, and root morphology traits. The protein localizes to plastid thylakoid membranes, chloroplast inner membrane, thylakoid, and chloroplast envelope. Studies of related genes in other species link the family to chlorophyll degradation and leaf senescence.