高密度种植专用油菜重要农艺性状与产量的关系分析

目的分析适宜高密度种植的油菜与适宜常规密度种植的油菜间重要农艺性状与产量关系的差异,为机械化高密度种植油菜的选育方向提供借鉴。方法对2008—2009年中国冬油菜区试中22个机械化高密度种植组合(品系)和72个常规密度种植的组合(品系)9个重要农艺性状与小区产量间进行相关及通径分析。结果高密度专用油菜组合的每角粒数、主花序有效角果数、单株有效角果数、结角密度与小区产量都有显著或极显著的相关关系,对小区产量的直接作用大小顺序为:结角密度(0.881)分枝部位高度(-0.614)株高(0.586)每角粒数(0.360)分枝数(-0.144)主花序有效角果数(-0.143)单株有效角果数(0.111)主花序有效长(0.095)千粒重(-0.055)。常规密度种植的油菜分枝数、主花序有效角果数、单株有效角果数、每角粒数以及分枝部位高度与产量有显著或极显著相关关系,对产量的直接效应顺序则为单株有效角果数(0.412)株高(0.297)主花序有效角果数(0.260)每角粒数(0.249)主花序有效长(-0.224)千粒重(0.156)分枝部位高度(-0.104)分枝数(0.095)结角密度(-0.003)。结论相比于常规密度种植的油菜,高密度种植油菜的选育应重点加强对结角密度和主花序有效角果数的选择,努力提高单株有效角果数和每角粒数并适当减少无效分枝数。

Correlation Analysis Between Agronomic Traits and Yield of Rapeseed (Brassica napus L.) for High-Density Planting

Objective The difference in the relation of agronomic traits and yield between rapeseeds suitable for mechanized high-density planting and conventional-density planting was studied. Method Twenty-two hybids (or lines) for high-density planting were studied in national winter rapeseed regional test from 2008 to 2009. The correlation and path analysis of nine major agronomic traits to yield per plot were conducted by contrast of seventy-two rapeseeds which are suitable for conventional-density planting.Result...