Premium
EFFECT OF BLUE LIGHT AND RED LIGHT ON THE CONTROL PEA LEAVES TO INCREASED FLUENCE RATES OF CHLOROPLAST ACCLIMATION OF LIGHT‐GROWN PEA LEAVES TO INCREASED FLUENCE RATES
Author(s) -
OPEZJUEZ ENRIQUEL,
HUGHES MARTINJ. G.
Publication year - 1995
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.1995.tb09250.x
Subject(s) - photosynthesis , chloroplast , acclimatization , chlorophyll , photosystem ii , fluence , botany , blue light , cytochrome f , biology , chlorophyll a , phytochrome , oxygen evolution , rubisco , greening , horticulture , red light , photosystem i , chemistry , biochemistry , optics , electrode , electrochemistry , ion , ecology , physics , organic chemistry , gene
— We have investigated the possibility of the involvement of a blue light fluence‐rate sensing photoreceptor in the light acclimation of chloroplast components in light‐grown pea seedlings. Low lightgrown seedlings were acclimated for 2 days to either 20 or 200 μmol m‐2 s‐2 of white, blue‐enriched, or broad‐band red light. An increase in blue‐enriched light fluence rate was more effective than that of red light in bringing about both inhibition of internode growth and the enhancement of the chlorophyll a/b ratio. Ribulose 1,5‐bisphosphate carboxylase/oxygenase and cytochrome f protein levels, per unit cell, also increased more markedly (around two‐fold) in response to an increase in blue light. The 23 kDa polypeptide of the oxygen‐evolving complex and the light‐harvesting chlorophyll d b protein of photosystem II apoprotein levels vaned under all wavelengths to a lesser extent, correlating with total protein levels or greening. These data are consistent with the hypothesis of a role for a blue photoreceptor in detecting low versus high fluence rate of light, and subsequently controlling the light acclimation responses. Nevertheless photosynthesis or other mechanisms of fluence‐rate photoperception must also be involved.