Seasonal Photoprotective Responses in Needles of Korean Fir (Abies koreana) Over an Altitudinal Gradient on Mount Halla, Jeju Island, Korea
Seasonal Photoprotective Responses in Needles of Korean Fir (Abies koreana) Over an Altitudinal Gradient on Mount Halla, Jeju Island, Korea
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韩国济州岛汉拿山海拔梯度上红杉针叶的季节性光保护反应
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
S. Koh
中科院分区：
文献类型：
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作者：
Soonja Oh;W. W. Adams;B. Demmig;S. Koh
摘要对韩国济州岛3个海拔高度的冷杉(Abies Koreana)针叶在夏季、冬季和春季的叶绿体色素和叶绿素荧光进行了研究。生长季节的高捕光效率(内在光系统II效率)和高光合作用速率(高水平的胡萝卜素和叶绿素b)的间接证据与冬季中期的光收集效率的下调形成对比，后者包括保留高玉米黄质水平和锁定光保护热耗散(来自低的叶绿素荧光发射)。叶黄素水平与冬季持续光保护呈负相关，叶黄素到叶黄素循环类胡萝卜素水平从夏季到冬季呈下降趋势，表明玉米黄质在杉木针叶冬季光保护中起着显著作用。夏季显然最有利于光合作用，这与济州岛夏季降水水平高是一致的，与美国科罗拉多州夏季高海拔干燥气候下的冷杉和其他针叶树相反，研究表明，潮湿的春季是最有利于光合作用的季节。最后，尽管三个地点的海拔只有300米之差，但在(I)冬季玉米黄质的积累(作为病情严重程度的指标，最高海拔处水平最高)，(Ii)夏季的表观光合作用速率(从胡萝卜素水平，最高海拔处最高)，以及(Iii)春季向光合作用增强的过渡(从荧光发射水平，在最高海拔处最慢)方面存在明显的差异。
Abstract Chloroplast pigments and chlorophyll fluorescence were characterized in needles of Korean fir (Abies koreana) in summer, winter, and spring at three altitudes on Jeju Island, Korea. High light-harvesting efficiency (intrinsic photosystem II efficiency) and indirect evidence for high photosynthetic rates (high levels of&bgr;-carotene and chlorophyll b) during the growing season contrasted with mid-winter downregulation of light-harvesting efficiency involving retention of high zeaxanthin levels and locked-in photoprotective thermal dissipation (from low chlorophyll fluorescence emission). Neoxanthin levels were inversely correlated with sustained photoprotection in the winter, and lutein to xanthophyll cycle carotenoid levels decreased from summer to winter, suggesting that zeaxanthin plays the prominent role in winter photoprotection of Korean fir needles. Summer was apparently most conducive to photosynthesis, consistent with high levels of summer precipitation on Jeju Island, and in contrast to fir and other conifers in a climate with dry summers at high altitudes in Colorado, U.S.A., where studies have shown that the wet spring is the season most favorable for photosynthesis. Lastly, despite there being only 300 m difference in altitude among the three sites, there were discernible differences in (i) accumulation of zeaxanthin in winter (as an indicator for the severity of conditions, with highest levels at the highest altitude), (ii) apparent photosynthesis rates in summer (from &bgr;-carotene levels, with highest levels at the highest altitude), and (iii) transition to increased photosynthesis in spring (from fluorescence emission levels, slowest at the highest altitude).
DOI：
10.1016/j.bbabio.2011.06.011
发表时间：
2011-09
期刊：
Biochimica et biophysica acta
影响因子：
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作者：
M. Zubik;R. Luchowski;W. Grudziński;M. Gospodarek;I. Gryczynski;Z. Gryczynski;J. Dobrucki;W. Gruszecki
通讯作者：
M. Zubik;R. Luchowski;W. Grudziński;M. Gospodarek;I. Gryczynski;Z. Gryczynski;J. Dobrucki;W. Gruszecki