%0 Journal Article
%T Photochemical Response in 0-Year-Old and 1-Year-Old Needles of Picea glehnii during Cold Acclimation and Low Temperature
%A Bae
%A Jeong-Jin
%A Toshihiko Hara
%A Yeon-Sik Choo
%J Journal of Ecology and Field Biology
%D 2008
%I 
%X P. glehnii, an evergreen conifer found in northern areas, is known as a cold-resistant species. Inthis experiment, we measured the water content, PS¢ò efficiency, chlorophyll fluorescence, pigments of thexanthophyll-cycle and activity of enzymes of the ascorbate-glutathione cycle during cold acclimation and atsubsequent low-temperature conditions to examine the importance of acclimation to cold tolerance. P. glehniishowed a decrease in PS¢ò efficiency (especially in Fv) during cold acclimation and at subsequent low temperatures.However, cold-acclimated needles showed higher PS¢ò efficiency at low temperatures than nonacclimatedneedles. In addition, 0-YON (first-year needles) showed an increase in ¦Â-carotene and lutein, while1-YON (one-year-old needles) immediately developed an antioxidant mechanism in the ascorbate-gluthathionecycle as soon as they were exposed to low temperature and both 0-YON and 1-YON showed increasedzeaxanthin and de-epoxidation ratios at continuous low temperature. Based on our results, we suggest that P.glehnii maintain PS¢ò efficiency at low temperature by effectively protecting the photosynthetic apparatus fromphoto-damage by rapid induction of an antioxidant mechanism in 1-YON and dissipation of excess energy by¦Â-carotene and lutein in 0-YON.
%K Ascorbate-glutathione cycle
%K Cold acclimation
%K Cold resistance
%K P. glehnii
%K PS¢ò efficiency
%K Xanthophyll-cycle.
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