CAB1 — Capsicum annuum

Summary

CaCAB1 (T459_11118) on pepper chromosome 4 encodes a chlorophyll a-b binding protein of the light-harvesting complex (LHC) family, containing Chloro_AB-bd_pln and chloroa_b-bind domains. The product is associated with chlorophyll binding, xanthophyll binding, and multiple activities in chlorophyll metabolism including chlorophyll b synthesis, Chl b reductase, pheophytinase, pheophorbide A oxygenase, and RCC reductase activities. CaCAB1 is associated with photosynthesis, light harvesting in both photosystems I and II, thylakoid membrane localization, and responses to low light, desiccation, and herbicide. The gene has been connected to agronomically important traits including fruit color, chlorophyll content and ratio, net photosynthetic rate, leaf yellowing tolerance, bacterial blight disease resistance, drought tolerance, heat and cold stress responses, flowering time, and starch content. Studies of related genes in other species link the family to thylakoid biogenesis, non-photochemical quenching, photoprotection, and stay-green phenotypes.