ENHANCED CHLOROPHYLLIDE ACCUMULATION AFTER FLASH IRRADIATION OF ETIOLATED WHEAT PLANTS TREATED WITH SAN-9789

摘要

The accumulation of Chlide was investigated in flash-irradiated dark-grown plants as dependent on the decreased carotenoid content. Wheat plants (Triticum aestivum L.) were treated with two concentrations (10 and 100 mu mol/L) of norflurazon (SAN-9789) during germination, which caused inhibition of carotenoid synthesis. When SAN-treated plants were grown in darkness the amount of accumulated protochlorophyllide increased. After an irradiation of carotenoid-deficient etiolated plants with an increasing number of flashes (1-6) the decrease of protochlorophyllide and the accumulation of chlorophyllide were faster in comparison with the non-treated ones. The flash irradiation of carotenoid-deficient plants caused phototransformation of a greater number of originally accumulated protochlorophyllide molecules to chlorophyllide, and in that way the Chi synthesis that had been stopped in darkness could continue more efficiently.