甘蓝型油菜初花期不同渍水时长对产量及产量因子的影响

Effects of Different Waterlogging Periods on Yield and Yield Components of Brassica napus at Early Flowering Stage

为了探究油菜种质资源的花期耐渍水能力,以湖南省主推甘蓝型油菜品种的亲本为材料,研究了初花期不同时长渍水处理对产量及产量因子的影响。结果表明:花期渍水5 d已足以对角果长以外的单株产量及其相关因子造成显著或极显著影响,显著或极显著降低株高、单株有效角果数、每角果粒数和单株产量,各亲本材料的平均产量减产63.5%;而花期渍水7 d处理由于处理时间过长,不但显著或极显著降低株高、单株有效角果数、角果长、每角果粒数和单株产量,且平均产量减产达89.3%,甚至个别处理的植株出现死亡;同时,花期渍水处理5 d后的产量与各产量因子之间均有显著的相关性,而处理7 d后的产量与各产量因子间的相关系数下降。因此,对甘蓝型油菜进行花期耐渍水能力筛选时,盆栽渍水处理的时长为5 d时比较理想。

In order to explore the waterlogging tolerance of oilseed rape at the flowering stage,this study applied different waterlogging treatments on the parental lines of Brassica napus widely promoted in Hunan Province and evaluated the influence of different waterlogging periods on the seed yield per plant and yield components.The results showed that waterlogging treatment of 5 d greatly affected plant height,effective pod per plant,seed number per pod,and seed yield per plant,which resulted in an average of 63.5% yield loss of all parent materials,while the treatment of 7 d was more severe,which not only caused significant or extremely significant reductions in plant height,effective pod per plant,pod length,seed number per pod,and seed yield per plant of all lines but also resulted in 89.3% yield loss and even deaths of individual plants.Meanwhile,the correlation between the yield and yield components of Brassica napus under treatment of 5 d was significant,while that between the yield and yield components under treatment of 7 d declined.Therefore,this study concluded that waterlogging treatment of 5 d was ideal while screening the waterlogging tolerance of Brassica napus at the flowering stage.