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运用SPSS统计分析软件,对不同氮素选择压力下的88份稻种资源苗期农艺性状与氮素营养效率进行分析。结果表明,稻种资源苗期氮素营养效率相关性状存在明显的基因型差异,且受氮素选择压力的影响。同一氮肥水平下,不同稻种资源间的单株根体积、地上部干重、吸氮量和根干重变异较大,而倒3叶SPAD值、氮素利用效率和绿叶数的变异较小;不同氮肥水平下,各性状的变异程度不同,单株根体积、根半径和冠根比的变异系数差异较大,而苗高、黄叶数和单株总干重的变异系数差异较小。在不同氮素选择压力下存在表征氮素营养效率的共同性状,与氮素利用效率偏相关显著的共同性状是倒3叶SPAD值,与氮素吸收效率偏相关显著的共同性状是倒3叶SPAD值和单株总干重。水稻苗期氮素利用效率筛选与鉴定的最佳施氮水平为高氮(60mg/kg),可行指标为倒3叶SPAD值;水稻苗期氮素吸收效率筛选与鉴定的最佳施氮水平为低氮(20 mg/kg),可行指标为倒3叶SPAD值和单株总干重。
The SPSS statistical analysis software was used to analyze the agronomic traits and nitrogen nutrition efficiency of 88 rice germplasm under different nitrogen selection pressure. The results showed that there were obvious genotypic differences in nitrogen nutrition efficiency related traits at seedling stage and were influenced by nitrogen selection pressure. Under the same nitrogen level, the variation of single root volume, aboveground dry weight, N uptake and root dry weight among different rice cultivars varied greatly, while the variation of SPAD value, nitrogen use efficiency Under different nitrogenous fertilizer levels, the variation degree of each trait was different. The coefficient of variation of single root volume, root radius and crown-root ratio differed greatly, but the difference of the coefficient of variation of seedling height, yellow leaf number and total dry weight per plant was small . There was a common trait characterizing the efficiency of nitrogen nutrition under different nitrogen selective pressures. The common trait significantly correlated with nitrogen use efficiency was inverted 3-leaf SPAD value, which was significantly correlated with nitrogen absorption efficiency. The common trait was inverted 3-leaf SPAD value and total dry weight of plant. The optimum nitrogen level for screening and identification of nitrogen use efficiency of rice at seedling stage was high nitrogen (60mg / kg), and the feasible index was SPAD value of inverted 3-leaf rice. The optimum nitrogen level for screening and identification of nitrogen absorption efficiency For low nitrogen (20 mg / kg), the feasible index is the inverted 3-leaf SPAD value and the total dry weight of the plant.