中国农业科学Issue(8)：1569-1578,10.DOI:10.3864/j.issn.0578-1752.2015.08.11
北方地区不同黄瓜品种氮素吸收与利用效率的差异
Variation in Nitrogen Uptake and Utilization Efficiency of Different Cucumber Varieties in Northern China
摘要
Abstract
[Objective]The objective of the experiment was to probe the variety variation of nitrogen uptake and utilization efficiency among cucumber genotypes in northern China for providing reference for nitrogen efficient varieties screening.[Method]Cucumber varieties of North China ecotype was used as the test materials in a hydroponic experiment, the split plot design was employed with main plot of nitrogen nutrition levels (3.5 mmol·L-1 and 11.0 mmol·L-1), sub-plot of cucumber varieties. Content, assimilate and utilization efficiency of nitrogen was measured, nutrition efficiency type was divided.[Result]The indicators related to nitrogen uptake and utilization efficiency at two nitrogen levels were significantly different among cucumber varieties. Plant dry weight, nitrogen uptake efficiency and nitrogen utilization index showed a significant varietal variation under two nitrogen levels, the coefficient of variation were CV N3.5 21.49%and CV N11 18.51%, CV N3.5 19.90%and CV N11 19.94%, CV N3.5 25.49%and CV N11 19.25%, respectively. Plant dry weight was very significantly correlated to stem-leaf N accumulation, plant N utilization indexes (P<0.01), and correlation coefficient were rN3.5 0.933**and rN11 0.925**, N3.5 0.964**and rN11 0.941**, respectively. Nitrogen uptake was significantly positively correlated with stem-leaf N accumulation, plant N utilization index, and the correlation coefficients were rN3.5 0.986** and rN11 0.963** , rN3.5 0.809** and rN11 0.768**, respectively; Nitrogen utilization efficiency was significantly negatively correlated with stem-leaf nitrogen content, and the correlation coefficients were rN3.5-0.909** and rN11-0.886**. Pant dry weight average as a standard under two nitrogen levels to classify nitrogen nutrition efficiency of cucumber varieties, the plant dry weight of efficient type was more than the average, and that of the inefficient type was less than the average. Varieties were classified into four nitrogen types, such as efficient-efficient, efficient-inefficient, inefficient-efficient, and inefficient-inefficient types. The least was inefficient-efficient type, which was 15.6%of these varieties. The path coefficient analysis revealed that nitrogen use efficiency was dominated by nitrogen uptake efficiency at two nitrogen levels, the path coefficient with nitrogen use efficient was qN3.5 1.069 and qN11 0.931, qN3.5 0.347 and qN11 0.361, respectively. [Conclusion] Nitrogen use efficiency of seedlings of different cucumber varieties showed a significant varietal variation. Plant dry weight can be used as the first index for evaluation difference in nitrogen use efficiency of seedlings at the same N level, stem-leaf nitrogen accumulation, stem-leaf N content and nitrogen utilization index can be used as the secondary indexes. Nitrogen uptake efficiency is a major factor for high N use efficiency of seedling. A hydroponic experiment can effectively reflect nitrogen nutrition efficiency variation of cucumber seedlings of different varieties, and it provides a possibility for massive screening of nitrogen use efficiency of cucumber seedlings and rapid identification.关键词
黄瓜/氮素吸收效率/氮素利用效率/氮素营养类型Key words
cucumber/nitrogen uptake efficiency/nitrogen utilization efficiency/nitrogen nutrition type引用本文复制引用
赵春波,宋述尧,赵靖,张雪梅,张越,张松婷..北方地区不同黄瓜品种氮素吸收与利用效率的差异[J].中国农业科学,2015,(8):1569-1578,10.基金项目
吉林省现代农业产业技术体系建设专项（2013026）、吉林省教育厅“十二五”科学技术研究项目 （）
