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한국생태학회 / v.31, no.4, 2008년, pp.317-325 
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( Photochemical Response in 0-Year-Old and 1-Year-Old Needles of Picea glehnii during Cold Acclimation and Low Temperature ) |
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| 초 록 |
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| P. glehnii, an evergreen conifer found in northern areas, is known as a cold-resistant species. In this experiment, we measured the water content, PSⅡ efficiency, chlorophyll fluorescence, pigments of the xanthophyll-cycle and activity of enzymes of the ascorbate-glutathione cycle during cold acclimation and at subsequent low-temperature conditions to examine the importance of acclimation to cold tolerance. P. glehnii showed a decrease in PSⅡ efficiency (especially in Fv) during cold acclimation and at subsequent low temperatures. However, cold-acclimated needles showed higher PSⅡ efficiency at low temperatures than nonacclimated needles. In addition, 0-YON (first-year needles) showed an increase in $eta$-carotene and lutein, while 1-YON (one-year-old needles) immediately developed an antioxidant mechanism in the ascorbate-gluthathione cycle as soon as they were exposed to low temperature and both 0-YON and 1-YON showed increased zeaxanthin and de-epoxidation ratios at continuous low temperature. Based on our results, we suggest that P. glehnii maintain PSⅡ efficiency at low temperature by effectively protecting the photosynthetic apparatus from photo-damage by rapid induction of an antioxidant mechanism in 1-YON and dissipation of excess energy by $eta$-carotene and lutein in 0-YON. |
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| 키워드 |
| Ascorbate-glutathione cycle;Cold acclimation;Cold resistance;P. glehnii;PSⅡ efficiency;Xanthophyll-cycle; |
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Journal of Ecology and Field Biology / v.31, no.4, 2008년, pp.317-325
한국생태학회
ISSN : 1975-020X
UCI : G100:I100-KOI(KISTI1.1003/JNL.JAKO200811440578138)
언어 : 영어 |
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| 논문 제공 : KISTI 한국과학기술정보연구원 |
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