CAB1 — Capsicum annuum

Summary

CaCAB1 (T459_05314) on pepper chromosome 2 encodes a chlorophyll a-b binding protein. The product possesses chlorophyll binding, xanthophyll binding, and multiple chlorophyll metabolic enzyme activities, and is localised to the thylakoid membrane, photosystems I and II, and the LHCII complex. CaCAB1 is associated with photosynthesis, light harvesting in both photosystems, chlorophyll anabolism and breakdown, pigmentation, and responses to low light, desiccation, herbicide, and drought. It has been linked to agronomically important traits including fruit colour, chlorophyll content and ratio, leaf yellowing tolerance, net photosynthetic rate, quantum yield, bacterial blight disease resistance, and responses to high and low temperature stress. Studies of related genes in other species connect the gene family to photosystem II function, state transitions, non-photochemical quenching, and drought tolerance.