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A net house experiment was conducted to investigate the relative effects of two inorganic forms of arsenic namely, arsenate (As V) and arsenite (As III), on some physiological parameters in leaves of cowpea (Vigna unguiculata L. Walp) cv. BCKV-1. Cowpea plants were grown in pot culture and were treated with different doses of As (V) and As (III) as 0 (control) 10, 20, 30 and 40 mg L -1 . The application of arsenic in either form showed an adverse effect on pigment and protein contents, net photosynthesis, transpiration rate, stomatal conductance especially at higher doses of 30 and 40 mg L 1 . A higher reduction in photosynthetic pigments, protein, transpiration rate and stomatal conductance were recorded in As (III) treatments than As (V), while net photosynthetic rate and intrinsic water use efficiency (IWUE) were most severely affected in As (V).

Changes in pigments and photosynthetic parameters of cowpea under two inorganic arsenicals