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Dissipation of excess excitation energy of the needle leaves in Pinus trees during cold winters
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, chlorop...
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Published in: | International journal of biometeorology 2016-12, Vol.60 (12), p.1953-1960 |
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Main Authors: | , , , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | 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 (
F
m
) and substantial absorption of light energy in winter leaves of all three species. The
F
m
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. |
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ISSN: | 0020-7128 1432-1254 |
DOI: | 10.1007/s00484-016-1182-3 |