Abstract
Solar UV-B radiation increased to 20 % over ambient level at Madurai was given to cowpea (Vigna unguiculata L. cv. Pusa-152) seedlings sufficiently supplied by potassium (0.88 mM K2SO4) and K-deficient (0.05 mM K2SO4). Leaf mineral composition was significantly changed due to both increased UV-B radiation and K-deficiency imposed independently or jointly for 12 d. A severe reduction in 23 kDa chloroplast protein was seen only in seedlings encountered combined stress.
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