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Acta Agron Sin ›› 2012, Vol. 38 ›› Issue (05): 887-895.doi: 10.3724/SP.J.1006.2012.00887

• TILLAGE & CULTIVATION · PHYSIOLOGY & BIOCHEMISTRY • Previous Articles     Next Articles

Differences of Nitrogen Status between Different N-uptake-efficiency Rapeseed (Brassica napus L.) Cultivars

CAO Lan-Qin1,2,WU Xiao-Ming2,YANG Rui1,TIAN Yang-Yang1,CHEN Xian-Ni1,CHEN Bi-Yun2,LI Ya-Jun1,GAO Ya-Jun1,3,*   

  1. 1 College of Resources and Environment, Northwest A&F University, Yangling 712100, China; 2 Institute of Oil Crop Research, Chinese Academy of Agricultural Sciences, Wuhan 430062, China; 3 Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture, Yangling 712100, China
  • Received:2011-09-06 Revised:2012-01-19 Online:2012-05-12 Published:2012-03-05
  • Contact: 高亚军, E-mail: yajungao@nwsuaf.edu.cn E-mail:lanqincao@yahoo.com.cn

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Abstract: A pot experiment was conducted to test nitrogen (N) uptake efficiency (NUE) of 50 rapeseed cultivars at two N application levels. The differences of N status indexes between high-nitrogen-efficiency-genotype (HNEG) and low-nitrogen-efficiency-genotype (LNEG) were analyzed. The results showed that N status varied dramatically among different genotypes. The greatest variance was found on N accumulation in root and ratio of N accumulation in root to total N uptake (>50%) while the least variance was found on N content of aboveground part of rapeseed during vegetative stage. At two N application levels, HNEG had significantly greater total N uptake and N accumulation in different parts of plant than LNEG. The maximum difference of N accumulation was found in root between HNEG and LNEG while the minimum difference of N accumulation was found in silique. The ratioof N accumulation in root to total N uptake for HNEG was higher than that for LNEG. The ratio of N accumulation in silique to total N uptake was higher for LNEG than for HNEG. During vegetative stage, no significant difference of N content of aboveground parts was found between HNEG and LNEG. However, HNEG had remarkable higher N accumulation in aboveground parts and higher SPAD value of leaves than LNEG. Changes of N supply level led to the greater changes of N content, N accumulation and the ratio of N accumulation in any part to total N uptake for HNEG than those for LNEG. Significant differences of nitrogen status between different rapeseed cultivars provide a basis to create new crop varieties for increase nitrogen use efficiency.

Key words: Rape seed, Nitrogen uptake efficiency, Cultivars, N content, N accumulation, SPAD

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