Low Temperature Tolerance of Parental,Inbred and Hybrid Lines of Brassica Napus at Germination Stage

甘蓝型油菜亲本系和杂交系发芽阶段的耐低温评价

In order to screen rapeseed accessions with low temperature tolerance in triple cropping area,comprehensive membership function method was used to evaluate the low temperature tolerance of 176 accessions including inbred and hybrid lines of Brassica napus with germination rate,germination energy,germination index and average germination time as indicators.The results showed that 103 accessions with strong low temperature tolerance and 27 accessions with sensitive to low temperature stress were identified.The low temperature tolerance was significant different among accessions(P<0.001)while insignificantly different among different types(sterile lines,maintainer lines,restorer lines,and hybrid lines,P=0.07).The integrated membership function value was significantly correlated with germination rate,germination index and average germination time,which provided valuable information for the future breeding of low temperature tolerant varieties,especially in the middle reaches of the Yangtze River basin.

为了在三熟制区筛选耐低温的油菜品系,本研究以发芽率、发芽势、发芽指数和平均发芽时间为指标,通过综合隶属函数法对176份自交或杂交的甘蓝型油菜材料进行耐低温评价。结果表明在9℃处理下鉴定出了103份耐低温和27份低温敏感型材料。其中,各材料间存在极显著差异但不育系、保持系、恢复系和杂交系等不同材料类型间差异不显著,同时,综合隶属函数值与各因素存在显著相关性,可在后期为长江流域选育耐低温品种提供有价值的信息。