Authors: Rashmi Raghuvanshi Rajesh Kumar Sharma
Publish Date: 2015/09/05
Volume: 23, Issue: 1, Pages: 831-842
Abstract
Enhanced solar ultravioletB UVB irradiance resulting from depletion in the ozone layer has the potential to cause detrimental effects on plants Higher altitudes tend to receive higher doses of ambient UVB radiation The present study was carried out to assess the effects of enhanced UVB ambient + 102 kJ m−2 day−1 radiation on two cultivars of Phaseolus vulgaris L cv Pusa Himlata and Pusa Parvati at growth physiological and biochemical levels grown under mountain ecosystem The magnitudes of negative effects of enhanced UVB radiation were found more in Pusa Parvati as compared to Pusa Himlata Nonenzymatic total phenolics and flavonoids content and enzymatic antioxidants superoxide dismutase catalase and peroxidase were increased in both cultivars at both the ages of growth but increase was found more in Pusa Himlata as compared to Pusa Parvati The study further showed that the economic yield of Pusa Himlata and Pusa Parvati was decreased by 14 and 44 respectively due to enhanced UVB radiation The higher decrease in the economic yield of Pusa Parvati depicted that increased amounts of total flavonoids content and stimulation of their antioxidant defense mechanism via increasing the activities of enzymatic antioxidants were not able to completely detoxify the produced reactive oxygen species under enhanced UVB radiation and made it more sensitive to applied stress From the present study it can be concluded that enhanced UVB radiation in the mountain areas of the Indian Himalayan Regions could be one of the environmental causes for lower yields of agricultural crops Cultivation of P vulgaris L cv Pusa Himlata should be promoted at higher altitudes of the Indian Himalayan Regions
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