CAB1 — Capsicum annuum

Summary

CaCAB1 (T459_19808) on pepper chromosome 7 encodes a chlorophyll a-b binding protein of the light-harvesting complex, with annotated chlorophyll, xanthophyll, chitosan and chitin binding activities, along with pheophytinase, chlorophyll b reductase, RCC reductase and pheophorbide a oxygenase activities. The gene is associated with photosynthesis light harvesting in photosystems I and II, chlorophyll anabolism and breakdown, thylakoid membrane protein import, responses to low light, desiccation, herbicide and drought, and phenylpropanoid metabolism. It localises to the thylakoid membrane, photosystems I and II, and the LHCII complex. Associations include fruit color, chlorophyll content and ratio, leaf yellowing tolerance, net photosynthetic rate, quantum yield, bacterial blight disease resistance, starch content, flowering time, and responses to high and low temperature, oxidative stress and cytokinin. Studies of related genes in other species link the family to thylakoid biogenesis, non-photochemical quenching, drought tolerance and chlorophyll catabolism.