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INFLUENCE OF LIGHT ON THE RESISTANCE OF CELLULAR PROTOPLASMIC STREAMING IN PLANTS TO 2,4‐DINITROPHENOL
Author(s) -
Lomagin A. G.,
Antropova T. A.
Publication year - 1963
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.1963.tb08910.x
Subject(s) - dinitrophenol , 2,4 dinitrophenol , cytoplasmic streaming , biophysics , sodium azide , protoplasm , xylem , botany , biology , chemistry , biochemistry , actin , cytoplasm
— Visible light sharply increases the resistance to 2,4‐dinitrophenol of the protoplasmic streaming in cells of green leaf disks of Tradescantia flurninensis Vell. and Campanula persicifolia L. Under the influence of light an increase in the resistance of the cellular semi‐permeability of Tradescantia fluminensis to 2,4‐dinitrophenol is also observed. Light produces no effect on the resistance to 2,4‐dinitrophenol of protoplasmic streaming in scale cells of Allium cepa L. bulbs, nor in the sensitivity of ciliated epithelium movement in the mucosus of the mouth cavity of the frog ( Ram temporaria L.) to this inhibitor. Light does not produce changes in the protoplasmic streaming resistance of Tradescctntia fluminensis cells to sodium azide. Aeration eliminates the protective effect of light on plant cells injured by 2,4‐dinitrophenol. Maximum increase in the protoplasmic streaming resistance of Campanula persicifolia cells to 2;4‐dinitrophenol is attained at 1000 lux, which is considerably lower than the photosynthetic light saturation. Further increase or decrease in light intensity leads to a decrease in the resistance of protoplasmic streaming to this poison. It is suggested that the protective action of light on cells of green leaf disks injured by 2,4‐dinitrophenol, is due to the photo‐reduction of 2,4‐dinitrophenol to 2‐amino‐4‐nitrophenol. As experiments have shown the toxicity of 2‐aniino‐4‐nitrophenol is insignificant as compared to that of 2,4‐dinitrophenol.