Chinese Journal OF Rice Science

Chinese Journal OF Rice Science >

2012 , Vol. 26 >Issue 3: 331 - 340

DOI: https://doi.org/10.3969/j.issn.10017216.2012.03.012

Research Papers

Difference in Nitrogen Absorption Ability and Its Reason in Conventional Japonica Rice Cultivars with Different Nitrogen Uptake Efficiencies

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  • 1 Key Laboratory of Crop Genetics and Physiology of Jiangsu Province/Key Laboratory of Crop Physiology, Ecology and Cultivation in Middle and Lower Reaches of Yangtze River， Ministry of Agriculture，Yangzhou University,  Yangzhou, 225009，China;  2 Bureau of Agriculture and Forestry of Jiangyin City， Jiangyin 214431，  China； 3 Wanshifa Industrial Company of Shanghai, Shanghai 202179, China；

Received date: 2011-09-08

  Revised date: 2011-11-25

  Online published: 2012-05-10

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Abstract

To investigate the main factors influencing nitrogen absorption ability and analyze its reason in conventional japonica rice cultivars with different nitrogen uptake efficiency, dry matter weight, nitrogen content, grain yield and its components were measured with 94 cultivars as materials in a hydroponic experiment in 2008 and 2009. Based on the amount of nitrogen absorption (ANA), these rice varieties were clustered into 6 types(in low to high order A, B, C, D, E and F) by the MinSSw (dynamic clustering methodminimum sum of squares within groups) method.Results were as follows: 1）Great differences in ANA were detected among all the tested cultivars with the maximum being 2.44 times as high as the minimum.The average grain yield of rice cultivars with high N uptake efficiency were significantly higher than those with low N uptake efficiency; 2）The rice cultivars with high N uptake efficiency had significantly higher ANA than those with low N uptake efficiency during pre and postheading stages. The ANA before heading had significantly higher effect on the total ANA than the ANA at grain filling stage; 3）The ANA of single panicle of rice cultivars with high N uptake efficiency was significantly higher than those of rice cultivars with low N uptake efficiency. However, there was no significant difference in panicle number per square meter among different rice cultivars. The ANA of single panicle exerted significantly greater effect on total ANA than the panicle number; 4）The rice cultivars with high N uptake efficiency had longer days from sowing to heading, growth duration, stronger N uptake intensity per panicle and per hill than those with low N uptake efficiency. The influence of N uptake intensity on ANA was significantly greater than that of  growth duration; 5）Dry matter accumulation of rice cultivars with high N uptake efficiency was significantly higher than that  of rice cultivars with low N uptake efficiency.However, compared with rice cultivars with low N uptake efficiency, the N content of rice cultivars with high N uptake efficiency had no advantage. Dry matter accumulation is one of the main factors influencing N absorptive capacity; 6）The ANA in  root, stem and leaf sheath, panicle of  rice cultivars with high N uptake efficiency were significantly higher than those of  rice cultivars with low N uptake efficiency.  The larger nitrogen transfer amount from stem, leaf and sheath to panicle after heading increased with rising ANA of stem, leaf and sheath before heading, which led to higher ANA of panicle at maturity stage and finally improved the ANA in the rice cultivars with high N uptake efficiency.

Key words： japonica rice; cultivar; amount of nitrogen absorption; nitrogen absorption ability

Cite this article

YU Xiaofeng1, WANG Jiangang1,2, LI Jinqian1,3, WANG Yi1, YUAN Qiumei1, ZHONG Jun1, CHEN Chen1, TIAN Hao1, ZHANG Yan1, HUANG Jianye1, WANG Yulong1, DONG Guichun1,* . Difference in Nitrogen Absorption Ability and Its Reason in Conventional Japonica Rice Cultivars with Different Nitrogen Uptake Efficiencies[J]. Chinese Journal OF Rice Science, 2012 , 26(3) : 331 -340 . DOI: 10.3969/j.issn.10017216.2012.03.012

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