Abstract
The impact of solar radiation with and without UV-B component was studied in a tropical legume Vigna unguiculata L. The average level of ambient UV-B was 10 kJ m −2 day −1. Exclusion of solar UV-B increased the seedling height, leaf area and fresh weight. On a unit fresh weight basis, a 50% increase in total chlorophyll and 47% decrease in flavonoids was noticed after 20 days of growth. Decrease in flavonoid content in UV-B filtered seedlings indicates the plant responsiveness to minimal UV-B radiation existing inside the filter cage. UV-B exclusion during the early phase of seedling growth also promoted photosynthetic activities, measured as O 2 evolution or fluorescence transients. Such an enhancement in activity was attributed to modification in thylakoid organization under UV-B exclusion.
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