Increased UV-B Radiation Reduces N sub(2)-Fixation in Tropical Leguminous Crops

Ozone depletion is allowing increased levels of UV-B radiation to reach the surface of the earth. Tests were conducted to assess the impacts of supplemental UV-B radiation on three leguminous plants maintained under field conditions. The UV-B radiation levels used for the experiments were equivalent...

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Published inEnvironmental pollution (1987) Vol. 95; no. 3; p. 289
Main Author Singh, Anupa
Format Journal Article
LanguageEnglish
Published 01.01.1997
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Abstract Ozone depletion is allowing increased levels of UV-B radiation to reach the surface of the earth. Tests were conducted to assess the impacts of supplemental UV-B radiation on three leguminous plants maintained under field conditions. The UV-B radiation levels used for the experiments were equivalent to a 15% reduction in ozone for 25 degree N latitude. Several different factors were monitored during the tests, including net photosynthesis, leaf area, biomass, and the number and size of nodules. The enhanced levels of UV-B radiation negatively impacted the net photosynthetic rate, growth characteristics, and nodule activity of all species tested. The largest decline in net photosynthesis occurred in Phaseolus mungo cv. Pant U-30. High reductions in nitrogenase activity were observed in Vigna radiata.
AbstractList Ozone depletion is allowing increased levels of UV-B radiation to reach the surface of the earth. Tests were conducted to assess the impacts of supplemental UV-B radiation on three leguminous plants maintained under field conditions. The UV-B radiation levels used for the experiments were equivalent to a 15% reduction in ozone for 25 degree N latitude. Several different factors were monitored during the tests, including net photosynthesis, leaf area, biomass, and the number and size of nodules. The enhanced levels of UV-B radiation negatively impacted the net photosynthetic rate, growth characteristics, and nodule activity of all species tested. The largest decline in net photosynthesis occurred in Phaseolus mungo cv. Pant U-30. High reductions in nitrogenase activity were observed in Vigna radiata.
Author Singh, Anupa
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