biologia plantarum

Biologia plantarum 49:99-104, 2005 | DOI: 10.1007/s10535-005-0104-8

Nitrogen nutrition of rice plants under salinity

E. M. Abdelgadir^1,*, M. Oka¹, H. Fujiyama¹

¹ Laboratory of Environmental Chemistry for Boiresources, Faculty of Agriculture, Tottori University, Tottori, Japan

Two rice (Oryza sativa L.) cultivars, Koshihikari and Pokkali, were grown in solution culture at three concentrations of NaCl or Na₂SO₄ [0 (S0), 50 (S1), and 100 (S2) mmol dm^-3] and three N contents [0.7 (N1), 7 (N2) and 14 (N3) mmol dm^-3]. Salinity significantly decreased dry matter of both cultivars. Pokkali had better growth than Koshihikari under both saline and non-saline conditions. Applications of N enhanced development of shoot dry mass under S0 and S1 treatments up to N2. Under S2, N application had no effect on shoot dry mass of both cultivars. Root dry mass of both cultivars decreased with increasing N application at S1 and S2. Shoot and root NO₃-N content in both rice cultivars increased with increasing N concentration in the nutrient solutions. The absorption of NO₃-N was less in Koshihikari than Pokkali plants, and also was much less in Cl^- than SO₄ ^2- salinity suggesting the antagonism between Cl^- and NO₃ ^-. In addition a significant negative correlation between concentrations of NO₃-N and Cl^- in the shoots or roots was observed in both cultivars

Keywords: Cl^-; cumulative transpiration; NO₃-N; Oryza sativa; SO₄^2-

Subjects: cultivar and genotype differences, nitrogen nutrition; gas exchange, salt stress; growth analysis, plant development, biomass and yield enhancement; nitrogen nutrition, salt stress, transpiration; Oryza sativa; rice, salt stress, nitrogen nutrition; salt stress, nitrogen nutrition; transpiration rate

Received: October 15, 2003; Accepted: April 21, 2004; Published: March 1, 2005Show citation