| 盐生植物海蓬子对不同形式的氮源的响应 |
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| 作者姓名： | N. KUDO H. FUJIYAMA |
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| 作者单位： | [1]The United Graduate School of Agricultural Science, Tottori University, 4-101 Koyamacho-minami, Tottori 680-8553（Japan） [2]Faculty of Agmculture, Tottori University, 4-101 Koyamacho-minami, Tottori 680-8853 （Japan） |
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| 基金项目： | *1Supported by the "Global Center of Excellence for Dryland Science", a project of the Ministry of Education, Science, Culture, Sports and Technology of Japan. |
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| 摘 要： | 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.
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| 关 键 词： | 盐生植物 北美海蓬子 氮素 植物生长调节 溶液浓度 源头 反应 施氮水平 |
| 收稿时间： | 4 October 2009 |
Responses of halophyte Salicornia bigelovii to different forms of nitrogen source |
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| N. KUDO,H. FUJIYAMA.Responses of halophyte Salicornia bigelovii to different forms of nitrogen source[J].Pedosphere,2010,20(3):311-317. |
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| Authors: | N KUDO and H FUJIYAMA |
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| Institution: | The United Graduate School of Agricultural Science, Tottori University, 4-101 Koyamacho-minami, Tottori 680-8553 (Japan);Faculty of Agriculture, Tottori University, 4-101 Koyamacho-minami, Tottori 680-8553 (Japan) |
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| 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 content in NO3--fed plants increased with the N concentration in solution; competitive inhibition of NO3- absorption by Cl- was observed under lower N conditions. In addition, shoot dry weight significantly correlated only with shoot N content. Therefore, growth of NO3--fed plants was regulated by N absorption. In contrast, N content 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 indicate that growth of NH4+-fed plants is mainly regulated by K absorption. |
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| Keywords: | cation absorption nitrogen nutrition plant growth saline stress |
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