CAB1 — Capsicum annuum

Summary

CaCAB1 (T459_05315) on pepper chromosome 2 encodes a chlorophyll a-b binding protein of the light-harvesting complex, with annotated molecular functions including chlorophyll, xanthophyll and chitosan binding, as well as pheophytinase, chlorophyll b reductase, RCC reductase and pheophorbide a oxygenase activities. The gene is associated with photosynthesis, light harvesting in both photosystems I and II, chlorophyll anabolism and breakdown, response to low light, desiccation and herbicide, pigmentation, phenylpropanoid metabolism, and regulation of the hypersensitive response. It localises to the thylakoid membrane, photosystems I and II, and the LHCII complex. Associations include fruit colour, chlorophyll content and ratio, leaf yellowing tolerance, bacterial blight disease resistance, net photosynthetic rate, quantum yield, starch content, flowering time, drought and temperature stress responses, and stomatal behaviour. Studies of related genes in other species link the family to thylakoid biogenesis, non-photochemical quenching, photoprotection, chlorophyll catabolism, stay-green phenotype, and bacterial disease resistance.