<FONT face="Verdana">Methods for  Identification and Screening of Rice Genotypes with High Nitrogen Efficiency</FONT>

CHENG Jianfeng,JIANG Hanyan,LIU Yibai, DAI Tingbo, CAO Weixing

doi:10.3969/j.issn.1001-7216.2010.02.12

Chinese Journal OF Rice Science >

2010 , Vol. 24 >Issue 2: 175 - 182

DOI: https://doi.org/10.3969/j.issn.1001-7216.2010.02.12

研究报告

Methods for Identification and Screening of Rice Genotypes with High Nitrogen Efficiency

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1Key Laboratory of Crop Physiology, Ecology and Genetic Breeding, Ministry of Education, Jiangxi Agricultural University, Nanchang 330045, China; 2Key Laboratory of Crop Growth Regulation, Ministry of Agriculture, Nanjing Agricultural University, Nanjing 210095, China; *Corresponding author, E-mail: chjfkarl@163.com

Received date: 1900-01-01

Revised date: 1900-01-01

Online published: 2010-03-10

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Abstract

Genotypic differences in nitrogen absorption efficiency (NAE), nitrogen utilization efficiency (NUE) and nitrogen harvest index (NHI) were investigated in ten rice genotypes with different nitrogen efficiencies at the elongation, booting, heading and maturity stages under six nitrogen levels in a pot experiment with sandsoil mixtures at various ratios. The results showed that NAE firstly increased and then decreased with increasing nitrogen rates, and the peak NAE was found under medium nitrogen rate (0.177 g/kg); but NUE and NHI of different rice genotypes decreased with increasing nitrogen rates. NAE of different rice genotypes increased with growing process and NUE followed a trend as follows: elongation stage >heading stage > maturity stage > booting stage. The effects of genotype or nitrogen level on NAE, NUE and NHI were significant at 0.01 level, which showed an order of nitrogen levels>genotypes> genotype×nitrogen level. The effects of genotype×nitrogen level interaction on NAE and NUE were significant at 0.01 level, but the effect of that on NHI was not significant. The elongation stage was the most suitable stage for identifying and evaluating NAE and NUE of rice because the differences of those traits among genotypes at the elongation stage were maximum. The optimum available soil nitrogen and stage for NAE, NUE and NHI identification and screening of rice in the experiment were 0.157 g/kg at the elongation stage, low nitrogen at the elongation stage and 0.277 g/kg at the maturity stage, respectively.

Key words： rice; genotype; nitrogen efficiency; identification; screening

Cite this article

CHENG Jianfeng,JIANG Hanyan,LIU Yibai, DAI Tingbo, CAO Weixing . Methods for Identification and Screening of Rice Genotypes with High Nitrogen Efficiency[J]. Chinese Journal OF Rice Science, 2010 , 24(2) : 175 -182 . DOI: 10.3969/j.issn.1001-7216.2010.02.12

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