PPH — Cucumis sativus

Summary

CsPPH (CSA_7G420790) on cucumber chromosome 7 encodes a pheophytinase with alpha/beta hydrolase fold, localised to chloroplast thylakoid and envelope membranes. It is associated with chlorophyll breakdown, leaf senescence, and the catabolic process of photosystem II light-harvesting complex II. The gene has been connected to fruit and flower development, stomatal closure, defence responses to bacteria and other organisms, and regulation of programmed cell death and the hypersensitive response. Associations include leaf yellowing tolerance, chlorophyll content, stay-green phenotype in darkness, lesion-mimic leaves, and disease tolerance. Studies of related genes in other species link the family to chlorophyll catabolism, stay-green phenotype, and cell death regulation.