Nitrate Effect on Rice Growth and Nitrogen Absorption and Assimilation at Different Growth Stages

DUAN Ying-Hua; ZHANG Ya-Li; SHEN Qi-Rong; WANG Song-Wei

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Nitrate Effect on Rice Growth and Nitrogen Absorption and Assimilation at Different Growth Stages

机译：硝酸盐对水稻不同生育期生长及氮吸收吸收的影响

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The effect of nitrate (NO3-) on rice (Oryza sativa L.) growth as well as N absorption and assimilation during different growth stages was examined using three typical rice cultivars. Dry weight, yield, N uptake, nitrate reductase activity(NRA) in leaves, and glutamine synthetase activity (GSA) in roots and leaves during their entire growth periods, as well as the kinetic parameters of ammonium (NH4+) uptake at the seedling stage, were measured with solution culture experiments. Results indicated that addition of NH4+-N and NO3--N at a ratio of 75:25 (NH4++NO3- treatment) whencompared with that of NH4+-N alone (NH4+ treatment) increased the dry weight of 'Nanguang' cultivar by 30% and treatment compared to the NH4+ treatment, NRA in the leaves increased by 2.09 folds, and GSA increased by 92% in the roots and 52% in the leaves of the three cultivars. NO3- supply increased the maximum uptake rate (Vmax) in the uptake rate of NH4+ by rice. There was no effect on the apparent Michaelis-Menten constant (Km) of the three cultivars.Thus, some replacement of NH4+ with NO3- could greatly improve the growth of rice plants, mainly on account of the increased uptake of NH4+ promoted by NO3-, and future studies should focus on the molecular mechanism of the increased uptake of NH4+ by NO3-.

机译：利用三种典型的水稻品种，研究了硝酸盐（NO3-）对水稻（Oryza sativa L.）生长以及不同生育阶段氮素吸收和同化的影响。整个生长期的叶片干重，产量，氮吸收，叶片中的硝酸盐还原酶活性（NRA）和根和叶片中的谷氨酰胺合成酶活性（GSA）以及苗期吸收铵态氮（NH4 +）的动力学参数用溶液培养实验测量。结果表明，与单独使用NH4 + -N（NH4 +处理）相比，以75:25的比例（NH4 ++ NO3-处理）添加NH4 + -N和NO3--N增加了'南光'品种的干重。与NH4 +处理相比，施肥量增加了30％，叶片中的NRA增加了2.09倍，而三个品种的根中GSA分别增加了92％和52％。 NO3供应增加了水稻对NH4 +的吸收率中的最大吸收率（Vmax）。对这三个品种的表观米氏常数没有影响，因此，用NO3-替代NH4 +可以大大改善水稻的生长，这主要是由于NO3-促进了NH4 +的吸收。，未来的研究应集中于NO3-增加NH4 +吸收的分子机制。

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《土壤圈（英文版）》 |2006年第6期|707-717|共11页
作者
DUAN Ying-Hua; ZHANG Ya-Li; SHEN Qi-Rong; WANG Song-Wei;
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作者单位

College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095(China);

College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095(China);

College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095(China);

College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095(China);

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收录信息中国科学引文数据库(CSCD);
原文格式 PDF
正文语种 chi
中图分类农业基础科学;
关键词
growth stages; N absorption and assimilation; nitrate; N uptake; rice;

机译：生长期;氮吸收与吸收;硝酸盐;氮吸收;水稻;

Nitrate Effect on Rice Growth and Nitrogen Absorption and Assimilation at Different Growth Stages

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