Biologia plantarum 50:709-712, 2006 | DOI: 10.1007/s10535-006-0112-3

Interactive effects of UV-B irradiation and triadimefon on nodulation and nitrogen metabolism in Vigna radiata plants

K. Rajendiran1,*, M. P. Ramanujam1
1 Botany Laboratory, Centre for Post Graduate Studies, Pondicherry, India

Supply of aqueous solution of triadimefon (20 mg dm-3) to unstressed green gram plants increased the contents of soluble proteins, amino acids, nitrate and nitrite, and the activity of nitrate reductase in the leaves and nitrate reductase in nodules. The nitrogenase activity in nodules and roots was also increased. Number and fresh mass of nodules and their nitrate and nitrite contents were also higher than those of the controls. In contrast, the UV-B stress (12.2 kJ m-2 d-1) suppressed nodulation and nitrogen metabolism in leaves and roots compared to plants under natural UV-B (10 kJ m-2 d-1). Triadimefon-treated plants did not show such severe inhibitions after exposure to elevated UV-B. Thus triadimefon increased their tolerance to UV-B stress.

Keywords: amelioration of UV-B stress; green gram; nitrate reductase; nitrogenase; triazole compounds
Subjects: amino acids; green gram; nitrate reductase; nitrogenase; nodules, nodulation; proteins; root, rooting; triadimefon; triazole compounds; UV-B radiation, stress

Received: September 21, 2004; Accepted: August 15, 2005; Published: December 1, 2006Show citation

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Rajendiran, K., & Ramanujam, M.P. (2006). Interactive effects of UV-B irradiation and triadimefon on nodulation and nitrogen metabolism in Vigna radiata plants. Biologia plantarum50(4), 709-712. doi: 10.1007/s10535-006-0112-3.
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