PLANT GROWTH, METABOLISM AND ADAPTATION IN RELATION TO STRESS CONDITIONS: XXVIII. PHYSIOLOGICAL EFFECTS OF UV RADIATION ON GROWTH AND PHOTOSYNTHETIC CAPACITY OF GERMINATING BROAD BEANS.

Document Type : Original Article

Authors

Department of Botany, Faculty of Science, Mansoura University, Mansoura, Egypt.

Abstract

Exposure of broad bean seedlings either germinated in dark conditions and/or in light conditions (40 W, low intensity and 160 W; high intensity) during germination to UV-A365nm and UV-C254nm for one hour daily throughout the entire period of the experiment (six days), led to significant decrease in all growth parameters determined (length of radicle, length of plumule, water content, fresh weight and dry weight) as compared with control seedlings. Significant changes were observed in the amount and in the relative composition of photosynthetic parameters (Chl a, Chl b, Chl a+b, Chl a/b, Cars, Total pigments) of the variously treated broad beans in relation to control samples. Photosynthetic activity expressed in the present work as the reduction of 2,6-DCPIP (PS II activity) of the differently treated broad beans showed variable significant changes as compared with control seedlings throughout the entire period of the experiment. These results are discussed mainly on the basis of the mechanism of action of UV radiation on growth and metabolic changes in broad beans during germination in dark or in light conditions.

Keywords

Journal of Plant Production
Volume 33, Issue 3
March 2008
Pages 1971-1883

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