甘蓝型油菜抗寒性的鉴定及相关性状的研究

Determination of winterhardiness and its correlated characters in Brassica napus

１４个甘蓝型油菜品种（系）的７个抗寒性状及其与越冬抗寒性关系的研究结果表明：不同油菜品种间越冬存活率存在极显著差异，洛川１８１、甘白油菜、１６１、８４－１６等品种的越冬抗寒性强。各性状间简单相关关系都达到显著或极显著水平。偏相关分析结果表明，总含水量与束／自、总含水量与可溶性糖含量、可溶性糖含量与越冬存活率之间呈极显著或显著的负偏相关。多元逐步回归分析结果表明，总含水量对越冬存活率的偏回归系数极显著，其它性状对越冬存活率的偏回归系数都不显著，说明叶片总含水量可考虑作为油菜抗寒性鉴定的指标。

rape (Brassica napus L.) varieties were analysed for their winterhardiness and 7 relative characters were determined in the experiment. The results showed that there existed significant difference among 14 varieties in their survival rates. Four varieties, namely Luochuang 181, Ganbai rape, Line 161, Line 84-16 were screened with high survival rates. Simple correlation analysis showed that there existed significant linear relationships between these characters. Partial correlation analysis showed that there were significant negative partial correlation between total water content in leaf (X4) and the ratio between bound water content and free water content (X5), between X4 and soluble sugar content (X2),and between X2 and survival rate (Y).Multiple step regression analysis showed that only partial regression coefficient between X4 and y reached significant level. Multiple step regression equation obtained was, y=949.170410.5021 X4. Coeffcient of determination R2=0.8779, which indicated that total water content in leaf considered to be index to screen the winterhardiness for rape genetic resource and segregation population in breeding programme.