Low temperature enhances photosynthetic down-regulation in French bean (Phaseolus vulgaris L.) plants.

ABSTRACT: The mechanisms of photosynthetic adaptation to different combinations of temperature and irradiance during growth, and especially the consequences of exposure to high light (2000 micro mol m(-2) s(-1) PPFD) for 5 min, simulating natural sunflecks, was studied in bean plants (Phaseolus vulgaris L.). A protocol using only short (3 min) dark pre-treatment was introduced to maximize the amount of replication possible in studies of chlorophyll fluorescence. High light at low temperature (10 degrees C) significantly down-regulated photosynthetic electron transport capacity [as measured by the efficiency of photosystem II (PSII)], with the protective acclimation allowing the simulated sunflecks to be used more effectively for photosynthesis by plants grown in low light. The greater energy dissipa

SUBMITTER: Tsonev T 

PROVIDER: S-EPMC4244959 | biostudies-literature | 2003 Feb

REPOSITORIES: biostudies-literature