CAB40 — Brassica juncea

Summary

BJUB05G14470S (CAB40, BjLHCB5) on chromosome B05 of Indian mustard encodes a chlorophyll a/b-binding protein of the LHC family, with 7-hydroxymethyl chlorophyll a reductase, serine-type peptidase, chlorophyll-binding and protein-folding chaperone activities. It is associated with the photosystem II antenna complex, LHCII, thylakoid membrane and chloroplast stroma, and linked to photosynthesis, light harvesting in both photosystems, nonphotochemical quenching, the chlorophyll cycle, photosystem II repair and assembly, protein folding and breakdown, and responses to light, cold and salinity. The gene has been connected to chlorophyll content, leaf senescence, root morphology, photoprotection, photosynthetic rate and efficiency, violaxanthin de-epoxidation, stomatal response to abscisic acid, and energy transfer efficiency. Studies of related genes in other species link the family to drought tolerance, abscisic acid sensitivity, quantum yield and neoxanthin content.