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| DOI：10.13522/j.cnki.ggps.2017.0174 |
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| Growth and Physiological Characteristics of Rice as Affected by NaCl under Different Nitrogen Applications |
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XU Chen, LIU Xiaolong, LI Qian, WANG Hongjun, WANG Nan, LING Fenglou, WU Zhihai, ZHANG Zhian
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Jilin Agriculture University, Changchun 130118, China; Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, China; Jilin Academy of Agriculture Sciences, Changchun 130124, China
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| Abstract: |
| 【Objective】 Plant growth is affected by various abiotic and biotic stresses and the objective of this paper is to experimentally study how nitrogen application could alleviate the adverse impact of NaCl on rice. 【Method】 The experiments were conducted in pots with two conventional varieties of japonica rice cultivated in north China as the model plant. The nitrogen treatment was to adjust the nitrogen concentration in the nutrient solution used for fertigation at 400% (4N), 200% (2N), 100% (1N), 50%(1/2N) and 25%(N/4) of the standard N concertation (0.715 mmol/L) normally used for fertigation. During the experiments, the below- and above-ground biomasses, the chemical compounds that control the osmosis in the leaf and root, MDA content, as well as the permeability of the leaf membrane were measured. 【Result】①Compared to the CK (standard nitrogen concentration without NaCl stress), salt stress significantly reduced the accumulation of both above- and below-ground biomass in all treatments, although the reduction in 2N, 1N and N/2 was least at tillering and booting-heading stages. ②Salt stress elevated the contents of soluble sugar and proline in both leaf and root of the two varieties. ③Salt stress also enhanced the synthesis of MDA and the permeability of leaf membrane, although the increase was least at the tillering and the booting-heading stage under 2N, 1N and N/2. 【Conclusion】 The experiment revealed that the optimal nitrogen application during tillering, booting and heading stages for ameliorating NaCl stress is 2N(1.43 mmol/L), 1N(0.715 mmol/L) and 1/2N (0.357 5 mmol/L). |
| Key words: rice; nitrogen level; salt stress; biomass; osmotic regulation substances; plasma membrane permeability |
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