期刊
RUSSIAN JOURNAL OF PLANT PHYSIOLOGY
卷 65, 期 5, 页码 658-666出版社
PLEIADES PUBLISHING INC
DOI: 10.1134/S1021443718050163
关键词
Pinus sylvestris; needles; chlorophyll fluorescence; photosynthetic pigments; seasonal dynamics; low-temperature adaptation
资金
- Institute for Biological Problems of the Cryolithozone, Siberian Branch, Russian Academy of Sciences [AAAA-A17-117020110054-6]
- Institute of Biology, Komi Research Center, Ural Branch, Russian Academy of Sciences [AAAA-A17-117033010038-7]
- Russian Science Foundation [14-50-00029]
The methods of chlorophyll fluorescence induction and HPLC were used to study the influence of autumnal temperature decrease on photochemical electron-transport activity of photosystem II (PSII), nonphotochemical quenching of excessive excitation energy, and the composition of pigments in the firstyear needles of Pinus s?lvestris L. trees grown naturally in Central Yakutia. In the period from the beginning of September to October 10, the chlorophyll content was reduced by half, while the Chl a/b ratio increased from 2.9 to 4.3-4.5, indicating the degradation of peripheral antenna complexes. The decrease in average daily temperature to 4.9-6.4 degrees C led to a transient increase in the quantum yield of nonphotochemical quenching (pH-dependent parameter phi NPQ). These changes were accompanied by a slow accumulation of unregulated zeaxanthin fraction insensitive to illumination conditions. The further decrease in average daily temperature to near-zero levels was paralleled by a sharp increase in zeaxanthin content, while the pH-dependent quenching was replaced with the constitutive quenching (parameter phi(f,D)) because of the supposed structural reorganization of PSII. These processes were accompanied by a fast decrease in PSII functional activity, which was mostly due to the impairment of plastoquinone photochemical reduction. Freezing temperatures (from-3.6 to-12.1) destructed the oxygen-evolving complex in PSII and completely inactivated the PSII reaction centers. It is concluded that the largest changes in the condition of photosynthetic apparatus occur at a near-zero temperature range and proceed until complete inactivation of PSII under the action of freezing temperatures.
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