CAB40 — Brassica juncea

Summary

BJUA09G45960S (CAB40, BjLHCB5) on Indian mustard chromosome A09 encodes a chlorophyll a/b-binding protein with 7-hydroxymethyl chlorophyll a reductase, serine-type peptidase, chlorophyll-binding, protein-folding chaperone, and identical protein-binding activities. The gene is associated with photosynthesis, light harvesting in both photosystems, nonphotochemical quenching, photosystem II repair and assembly, chlorophyll cycling and metabolism, protein breakdown and folding, chlorophyll fluorescence, and responses to light, cold, salinity, and thirst. It localizes to the photosystem II antenna complex, LHCII, thylakoid membrane, chloroplast stroma, and thylakoid lumen. Associations include chlorophyll content, leaf senescence, root morphology, photoprotection, photosynthetic rate and efficiency, energy transfer, neoxanthin binding, violaxanthin de-epoxidation, stomatal response to abscisic acid, and protein degradation. Related genes in other species link the family to drought tolerance, abscisic acid sensitivity, quantum yield, photochemical quenching, and sodium concentration.