Pedosphere 20(3): 311--317, 2010
ISSN 1002-0160/CN 32-1315/P
©2010 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Responses of halophyte Salicornia bigelovii to different forms of nitrogen source |
N. KUDO1 and H. FUJIYAMA 2 |
1 The United Graduate School of Agricultural Science, Tottori University, 4-101 Koyamacho-minami, Tottori 680-8553 (Japan);
2 Faculty of Agriculture, Tottori University, 4-101 Koyamacho-minami, Tottori 680-8553 (Japan) |
| ABSTRACT |
| Salt-affected soils are agricultural and environmental problems on a global scale. Plants suffer from saline stresses in these soils and show nitrogen (N) deficiency symptoms. However, halophytes grow soundly under saline conditions. In order to clarify the N nutrition of the halophyte Salicornia bigelovii, it was grown at several N levels (1, 2, 3, and 4 mmol L-1), supplied in the form of NO3- or ammonium (NH4+), under high NaCl conditions (200 mmol L-1). NH4+-fed plants showed better growth than NO3--fed plants at 1-3 mmol L-1 N, and plants in both treatments showed the same growth at 4 mmol L-1 N. Nitrogen contents in NO3--fed plants increased with the N concentrations in solution; competitive inhibition of NO3- absorption by Cl- was observed under lower N conditions. In addition, shoot dry weight was significantly correlated only with shoot N content. Therefore, growth of NO3--fed plants was regulated by N absorption. Inc ontrast, N contents of shoots in NH4+-fed plants did not change with N concentration. Shoot Na content decreased with increasing N concentration, while K content increased. Dry weight was highly correlated only with K content in NH4+-fed plants. These observations indicated that growth of NH4+-fed plants was mainly regulated by K absorption. |
| Key Words: cation absorption, nitrogen nutrition, plant growth, saline stress |
| Citation: Kudo, N. and Fujiyama, H. 2010. Responses of halophyte Salicornia bigelovii to different forms of nitrogen source. Pedosphere. 20(3): 311-317. |
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