Probably involved in the integration of pigments into the mature light-harvesting pigment-protein complexes. Light-harvesting chlorophyll (LHC) a/b-binding protein required to ensure a high rate of chlorophyll accumulation during deetiolation in continuous high light. Involved in seed germination. May fulfill a photoprotective functions. Prevents excess accumulation of free chlorophyll by inhibiting the entire chlorophyll biosynthesis pathway (e.g. 5-aminolevulinate synthesis and Mg-protoporphyrin IX chelatase activity), and hence prevent photooxidative stress. Associated with both photosystems I and II (By similarity). Coisolates equally with monomeric (mLhcb) and trimeric (tLhcb) populations of the major LHC from photosystem II (PSII) in response to 2 hours light stress. Appears transiently during greening of etiolated seedlings and disappears before chloroplast development is completed. By high-intensity light, mostly at cold temperature (e.g. 4 degrees Celsius) (at protein level). This high-light-mediated accumulation is inhibited by okadaic acid. A stepwise accumulation is induced when 40 percents of PSII reaction centers become photodamaged. Induced by UV-A, red, far-red and blue lights illumination in a phytochrome A and phytochrome B-dependent manner. The COP9 signalosome is involved in dark-mediated repression. Accumulates upon heat shock but repressed at continuous high temperatures (). Transcript levels follow a circadian cycle, with highest levels 2 h after light, without protein accumulation. In light stress-preadapted or senescent leaves exposed to light stress there is a lack of correlation between transcript and protein accumulation; transcripts accumulate in yellow leaves exposed to high light, but not proteins. Reduced greening during deetiolation in continuous high light, with a reduced ratio between chlorophylls a and especially at the highest irradiances. Slight reduction in the rate of chlorophyll accumulation during greening at moderate light intensities, and lower zeaxanthin accumulation in high light conditions. Normal sensitivity to photoinhibition and photooxidation. Impaired seed germination, especially at hot temperatures (30 degrees Celsius). Belongs to the ELIP/psbS family. Truncated N-terminus.