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PHOTOINHIBITION OF PHOTOSYNTHESIS IN ASTERIONELLA FORMOSA (BACILLARIOPHYCEAE) 1, 2
Author(s) -
Belay Amha,
Fogg G. E.
Publication year - 1978
Publication title -
journal of phycology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.85
H-Index - 127
eISSN - 1529-8817
pISSN - 0022-3646
DOI - 10.1111/j.1529-8817.1978.tb00310.x
Subject(s) - photoinhibition , photosynthesis , biology , botany , irradiance , carbon fixation , darkness , nutrient , sunlight , environmental chemistry , horticulture , ecology , photosystem ii , chemistry , physics , quantum mechanics , astronomy
A laboratory study was made of the inhibition of photosynthesis, as measured by the radiocarbon method, of Asterionella Formosa Hass. by light from tungsten halogen lamps of irradiances up to that of full sunlight. The observed inhibitions were of total fixation of carbon and were not due to greatly increased release of extracellular products of photosynthesis. Inhibition increased width irradiance and with time of exposure. It was greater at high temperature, at high oxygen concentrations and when the cells were nutrient deficient. Recovery from exposure to high irradiances took place both in the dark and at low irradiances. The inhibition, which is similar to that observed under natural conditions, has the characteristics of photooxidative damage to both photochemical and dark reaction mechanisms.