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《Molecular Plant Breeding》 2018-10
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Genetic Effect Analysis of Nitrogen Nutrition Efficiency in Brassica napus L.

Zou Xiaoyun;Guan Chunyun;Institute of Crops, Key Laboratory of Oil Crops, Jiangxi Academy of Agricultural Sciences;Oilseed Crops Institute, National Oil Crops Improvement Center, Hunan Agricultural University;  
In order to understand the effect value of each genetic component of the nitrogen fertilizer utilization rate of Brassica napus and to reveal the quantitative genetic basis that cause the difference of utilization rate of nitrogen fertilizer, we produced six generations(P1, P2, F1, B1, B2, and F2) from a cross between high nitrogen use efficiency rapeseed cultivar Xiangyou15 and low nitrogen use efficiency rapeseed cultivar R210 through major gene plus polygene mixed genetic model. In the mature period, we measured the nitrogen content in each generation and analyze the difference in nitrogen nutrition efficiency. The results showed that there were significant genotype differences existed in nitrogen absorption efficiency(NAE), nitrogen utilization efficiency(NUE) and nitrogen harvest index(NHI) of different rapeseed generations. Nitrogen nutrition efficiency had a wide range of genetic variation,and the distribution was continuous. The optimal model for NAE was B-1(two pairs of additive-dominant-epistatic major gene model), and the major gene heritability rate was 71.36%. The optimal model for NUE was D-2(onepair of additive major gene+additive-dominant polygenic genes model). The optimal model for NHI was E-0(two pairs of additive-dominant-epistatic major gene +additive-dominant-epistatic polygenic genes model), with the major gene heritability rate of 58.13%. The research results indicated that the genetic models of different nitrogen efficiency indicators were different, so the best nitrogen nutrition efficiency should be improved according to different fields and research purposes in the genetic improvement of nitrogen nutrition efficiency of rapeseed. The genotypes of rapeseed with high nitrogen nutrition were abtained by hybridization and backcross with different nitrogen efficiency rapeseed genotypes. The study provided theoretical basis and application value for nitrogen efficient breeding.
【Fund】: 国家自然科学基金(31760393);; 江西省杰出青年人才资助计划(20171BCB23082);; 江西省科技创新团队建设计划(20152BCB24013);; 江西省农业科学院博士启动项目(20162CBS009)共同资助
【CateGory Index】: S565.4
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