Journal
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY
Volume 152, Issue -, Pages 347-356Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jphotobiol.2015.08.010
Keywords
Apple tree leaves; Delayed chlorophyll fluorescence; Photochemical reactions; Prompt chlorophyll fluorescence; Seasonal shift; Thermotolerance
Categories
Funding
- National Natural Science Foundation of China [31171915]
- Program for New Century Excellent Talents in University, State Education Ministry
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During the seasonal shift from June to August, air temperatures increase. To explore how apple trees improve their thermotolerance during this shift, we examined the photochemical reaction capacity of apple tree leaves by simultaneous measurement of prompt chlorophyll fluorescence, delayed chlorophyll fluorescence, and modulated 820 nm reflection at varying temperatures. It was found that the reaction centers and antennae of photosystem II (PSII) and photosystem I (PSI), the donor side of PSII, the electron transfer capacity from Q(A) to Q(B), and the reoxidation capacity of plastoquinol were all sensitive to heat stress, particularly in June. As the season shifted, apple tree leaves improved in thermotolerance. Interestingly, the acclimation to seasonal shift enhanced the thermotolerance of PSII and PSI reaction centers more than that of their antennae, and the activity of PSII more than that of PSI. This may be a strategy for plant adaptation to changes in environmental temperatures. In addition, results from prompt and delayed fluorescence, as well as modulated 820 nm reflection corroborate each other. We suggest that the simultaneous measurement of the three independent signals may provide more information on thermal acclimation mechanisms of photochemical reactions in plant leaves. (C) 2015 Elsevier B.V. All rights reserved.
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