CAB1 — Capsicum annuum

Summary

CaCAB1 (T459_24031) on pepper chromosome 9 encodes a chlorophyll a-b binding protein of the light-harvesting complex family, with annotated chlorophyll, xanthophyll, chitosan and chitin binding activities, plus 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, thylakoid membrane protein import, responses to low light, desiccation, herbicide, drought and chitin, and phenylpropanoid metabolism. It localises to the thylakoid membrane, photosystems I and II, LHCII and the chloroplast. Associations include fruit color, chlorophyll content and ratio, leaf yellowing tolerance, bacterial blight disease resistance, net photosynthetic rate, quantum yield, starch content, flowering time, leaf senescence, and responses to high and low temperature, oxidative stress, cytokinin and brassinosteroid. Studies of related genes in other species link the family to thylakoid biogenesis, non-photochemical quenching, photoprotection, drought tolerance and stay-green phenotypes.