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当前位置: 首页 > 文章 > 增硝营养对不同基因型水稻苗期吸铵和生长的影响 土壤学报 2005,42 (2) 260-265
Position: Home > Articles > EFFECT OF NITRATE ON THE AMMONIUM UPTAKE AND GROWTH OF DIFFERENT GENOTYPES OF RICE (ORYZA SATIVA)AT THE SEEDLING STAGE Acta Pedologica Sinica 2005,42 (2) 260-265

增硝营养对不同基因型水稻苗期吸铵和生长的影响

作  者：
段英华;张亚丽;沈其荣
单  位：
南京农业大学资源与环境科学学院
关键词：
水稻;NH+4;NO-3;吸收
摘  要：
随着水稻节水栽培技术越来越得到广泛的应用与推广以及水稻在淹水条件下根际氧化圈的存在,水稻的硝酸盐营养作用受到更大的关注。利用水培方法研究了4种具代表性的水稻基因型(常规籼稻、常规粳稻、杂交籼稻、杂交粳稻)在苗期(2 8d)的铵(NH+ 4 )吸收动力学特性以及硝(NO-3 )对NH+ 4 吸收动力学特征和叶片谷氨酰胺合成酶活性(GSA)的影响。结果表明:增NO-3 营养可以增加水稻对氮素的吸收,提高氮素利用率,进而促进水稻生长;不同基因型之间NH+ 4 吸收速率的差异为:杂交籼稻>常规籼稻>杂交粳稻>常规粳稻;NO-3 的存在促进了水稻对NH+ 4 的吸收,增加水稻吸收NH+ 4 的Vmax值(4个品种平均增加31 5 % ) ,而对其Km 值影响不大(4个品种平均增加4 2 6 % ) ,说明NO-3 对NH+ 4 吸收的影响主要在于影响NH+ 4 载体的运转速率而非吸收位点与NH+ 4 之间的亲和性;增NO-3 营养可以增加叶片谷氨酰胺合成酶(GS)的活性,提高水稻同化NH+ 4 的能力
译  名：
EFFECT OF NITRATE ON THE AMMONIUM UPTAKE AND GROWTH OF DIFFERENT GENOTYPES OF RICE (ORYZA SATIVA)AT THE SEEDLING STAGE
作  者：
Duan Yinghua Zhang Yali Shen Qirong (College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China)
关键词：
Rice;Ammonium;Nitrate;Uptake
摘  要：
Nitrate is becoming more and more important for N nutrition of rice plants since rice is now cultivated in intermittent irrigation or even in aerobic soil condition. Moreover, the rhizosphere of rice roots is actually in partial oxidized status due to the released oxygen by rice roots. Solution culture experiments were carried out to study the effect of NO - 3 on the NH + 4 uptake kinetics of rice roots and the glutamine synthetase activity (GSA) in leaves of four typical rice genotypes (Conventional Indica , Conventional Japonica , Hybrid Indica , Hybrid Japonica ) at the seedling stage (28 day old). The results obtained were as follows. Partial replacement of NH + 4 by NO - 3could improve the growth and N uptake of rice. The rate of NH + 4 uptake by different genotypes was in following order: Hybrid Indica >Conventional Indica >Hybrid Japonica >Conventional Japonica. The presence of NO - 3 could increase the NH + 4 uptake of rice. This increase was mainly attributed to a significantly increased V max (31.5% on average of the four genotypes) in the treatment with NO - 3 while the K m values for NH + 4 (the increased percentage being 4.26% on average of the four genotypes) were not significantly affected by the addition of NO - 3. NO - 3 could also increase the GSA in the leaves of rice, and thus, the assimilation of NH + 4 were improved.

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