Cold Acclimation and Photoinhibition of Photosynthesis Accompanied by Needle Color Changes in Cryptomeria japonica during the Winter

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This study focused on the physiological changes in Cryplomeria japonica accompanied by needle color changes during the winter The physiological measurements include gas exchange, chlorophyll fluorescence, pigments, active oxygen scavenging enzymes, and several proteins in the photosynthetic apparatus. The light-saturated photosynthesis decreased during the winter. Total chlorophyll content and chlorophyll alb ratio decreased; meanwhile xanthophyll cycle pigments and lutein contents increased significantly. These results indicate that cold acclimation had occurred. Photomhibition was also observed in C japonica which can be determined from the decreases in photochemical efficiency of PS II and the partial closure of PS II reaction centers. Small and large subunits of Rubisco and LHC II in the needles of C japonica showed only a slight decrease during the winter, indicating that photoinhibiton in C japonica probably reflects a protective process to prevent more severe damage to the photosynthetic apparatus during low-temperature stress.
一般社団法人日本森林学会の論文
1999-08-16