不同氮素籽粒生产效率油菜品种氮素积累差异研究

Study on nitrogen accumulation in Rapeseed (Brassica napus. L) with different nitrogen utilization efficiency for grain production

2007-2008年以98个甘蓝型常规油菜品种(系)为材料,在不同氮肥水平下通过测定成熟期不同器官干重、氮素含量,采用组内最小平方和动态聚类方法对供试品种的氮素籽粒生产效率(NUEg)进行聚类并研究了不同类型品种的氮素积累差异。结果表明,不同品种氮素籽粒生产效率差异较大,类型间达极显著差异。不同类型品种的产量随着氮素籽粒生产效率的增加而增加。不同类型品种氮素积累总量差异较小;不同类型品种随着氮素籽粒生产效率增加,茎枝和果壳积累氮素减少,籽粒积累氮素增加。相关分析结果表明,氮素籽粒生产效率与茎枝和果壳氮素积累呈极显著负相关,与籽粒氮素积累呈极显著正相关。通径分析结果表明,提高氮素籽粒生产效率首先是降低营养器官中氮素积累,其次才是增加籽粒氮素积累。

In this study, 98 conventional rapeseed （Brassica napus. L） euhivars were cultured in 2007-2008 under different nitrogen application levels. Through testing dry matter weight and content of nitrogen, the tested rapeseed cuhivars were classified into 6 types based on their nitrogen use efficiency for grain production （NUEg） level by the MinSSw method, to study their characteristics of nitrogen accumulation. Results showed that differences of NUEg in the cuhivars used in this study were significant. The yield increased with the increase of NUEg. Differences of total amount of nitrogen accumulation was slight in different types. As NUEg increased, the amount of nitrogen accumulation of stem and shell decreased, and the amount of nitrogen accumulation of seed increased. The correlation analysis showed that NUEg had extremely significantly positive correlation with amounts of nitrogen in stems and shells at ripening stage, but it had extremely significantly negative correlation with the amount of nitrogen in seeds. The study of path analysis indicated that it was most important for NUEg to decrease nitrogen accumulation of vegetative organs, and secondary was to increasing nitrogen accumulation of seeds.