Changes induced by ultraviolet-B (280-320 nm) radiation to vegetative growth and photosynthetic characteristics in field grown Vigna unguiculata L.

摘要

The effect of ultraviolet-B (280-320 nm) radiation on growth and photosynthetic characteristics were investigated in field grown Vigna unguiculata L. Plants were grown at ambient and ambient plus a 1.8 kJ/m~2 supplementation of UV-B radiation for 25 days. The supplemental UV-B fluence used in this experiment simulated a 16/100 depletion in stratospheric ozone at midday in the summer at 10N latitude. Exposure to UV-B radiation had increased the plant height, leaf area and leaf biomass. The level of total chlorophyll on a unit fresh weight basis showed marginally decreased in the UV-B treated seedlings. No significant difference was seen in the concentration of UV-B absorbing compounds and RuBP case activity in UV-B treated seedlings.