Dissipation of excess excitation energy of the needle leaves in Pinus trees during cold winters
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- 作者：AO Zhang ; Zhen-Hai Cui ; Jia-Lin Yu ; Zi-Ling Hu…
- 关键词：Pinus koraiensis ; Pinus tabulaeformis ; Pinus armandi ; Chlorophyll fluorescence ; Photoinhibition ; Absorption spectrum ; Xanthophyll cycle ; Photosystem complex
- 刊名：International Journal of Biometeorology
- 出版年：2016
- 出版时间：December 2016
- 年：2016
- 卷：60
- 期：12
- 页码：1953-1960
- 全文大小：877KB
- 刊物类别：Earth and Environmental Science
- 刊物主题：Environment, general; Biological and Medical Physics, Biophysics; Meteorology; Animal Physiology; Plant Physiology; Environmental Health;
- 出版者：Springer Berlin Heidelberg
- ISSN：1432-1254
- 卷排序：60
文摘
Photooxidative damage to the needle leaves of evergreen trees results from the absorption of excess excitation energy. Efficient dissipation of this energy is essential to prevent photodamage. In this study, we determined the fluorescence transients, absorption spectra, chlorophyll contents, chlorophyll a/b ratios, and relative membrane permeabilities of needle leaves of Pinus koraiensis, Pinus tabulaeformis, and Pinus armandi in both cold winter and summer. We observed a dramatic decrease in the maximum fluorescence (Fm) and substantial absorption of light energy in winter leaves of all three species. The Fm decline was not correlated with a decrease in light absorption or with changes in chlorophyll content and chlorophyll a/b ratio. The results suggested that the winter leaves dissipated a large amount of excess energy as heat. Because the cold winter leaves had lost normal physiological function, the heat dissipation depended solely on changes in the photosystem II supercomplex rather than the xanthophyll cycle. These findings imply that more attention should be paid to heat dissipation via changes in the photosystem complex structure during the growing season.