基于结构方程模型的油菜性状和产量关系研究

为量化描述和分析甘蓝型油菜(Brassica napus L.)种植结构的调整以及相关性状变化对产量的影响,本研究利用结构方程模型对连续10年品种选育所得的168组产量和相关性状等数据进行分析,并对不同密度下相关性状和产量数据进行显著性分析。结果显示,在本实验密度范围内随着种植密度的增加,单株产量显著降低,且主要通过单株有效角果数影响单株产量,但总产量呈上升的趋势。研究所选各个性状对单株产量的总效应为:单株有效角果数>分枝数>千粒重>主花序有效角数>主花序有效长>每果粒数。因此,在培育更具有耐密性和对环境适用性的品种的同时,要选育拥有更多单株有效角果数和分枝数的品种以稳定单株产量,综合提高油菜总产量。

Relationships between traits and yields of rapeseed based on the structural equation modeling

       To quantitively describe and analyze the influences of adjustment of planting structure and change of main traits on the yield of rapeseed (Brassica napus L.), we studied and analyzed the data of a variety selection experiment, which included 168 sets of data of yields and other traits in 10 continuous years (2007-2016), with the structure equation model (SEM). A significance analysis was also conducted on the relative traits and yields of rapeseed under different densities investigated in this study. The result showed that yield per plant reduced significantly with the increase of planting density. Yield per plant was mainly influenced by the number of effective pods per plant. However, the total yield increased with the increase of planting density. The traits investigated in this study showed different levels of total effects on yield per plant as: effective pods per plant > branches > 1000-kernel dry weight > effective pods of main inflorescence > effective length of main inflorescence > seeds per pod. Thus, in order to increase the total yield of rapeseed, we should cultivate cultivars that are more density tolerant and suitable for their environment. At the same time, rapeseed cultivars with more effective pods and branches per plant should be bred to stabilize the total yield.