Increased UV-B radiation reduces N2-fixation in tropical leguminous crops

• Published in: Environmental pollution (1987) Vol. 95; no. 3; pp. 289 - 291
• Main Author: SINGH, A
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier 1997
• Subjects: Biological and medical sciences; Biological effects of radiation; Fundamental and applied biological sciences. Psychology; Non agrochemicals pollutants; Non ionizing radiations. Hertzian waves. Biooptics; Phytopathology. Animal pests. Plant and forest protection; Pollution effects and side effects of agrochemicals on crop plants and forest trees. Other anthropogenic factors; Pollution effects. Side effects of agrochemicals; Tissues, organs and organisms biophysics; Asia; India; Uttar Pradesh; Field experiment; Enzymatic activity; Physical simulation; Dicotyledones; Angiospermae; Nitrogen fixation; Intraspecific comparison; Diazotrophy; Photoprotection; Symbiosis; Light effect; Subtropical zone; Photoprotector; Enzyme; UVB radiation; Preservation agent; Interspecific comparison; Vigna radiata; Tropical crop; Stratosphere; Ozone; Biophysics; Agroclimatology; Grain legume; Biological fixation; Phytotoxicity; Vegetable crop; Ultraviolet irradiation; Leguminosae; Net assimilation rate; Nitrogenase; Environment; Spermatophyta; Oxidoreductases; stratospheric ozone depletion; Photosynthesis; Radiation protection; Vigna mungo
• ISSN: 0269-7491; 1873-6424
• DOI: 10.1016/S0269-7491(96)00146-7

Net photosynthesis, leaf area, biomass, and number, size and activity of nodules were examined in three leguminous plants subjected under field conditions to supplemental UV-B radiation equivalent to a 15% ozone depletion at 25 degrees N latitude. Enhanced UV-B radiation adversely affected the net photosynthetic rate, growth characteristics and nodule activity in all three species. Maximum reduction in net photosynthesis occurred in Phaseolus mungo cv. Pant U-30, whereas the greatest reduction in nitrogenase activity occurred in Vigna radiata.