基于逐步回归分析的甘蓝型油菜的抗倒性评价

Evaluation of Lodging Resistance of Rapeseed( Brassica napus) Based on Stepwise Regression Analysis

根据18个油菜品种9个指标与倒伏指数的调查数据,通过逐步回归分析,建立了以下回归方程:Y=-2.033-0.052X1+0.013X2+0.092X4+6.423X7-4.950X8-0.385X9[Y表示倒伏指数,X1表示株高,X2表示生物产量,X4表示分枝高度,X7表示(薹茎+主花序)/(缩茎+伸长茎),X8表示薹茎/伸长茎,X9表示(薹茎+伸长茎)/缩茎]。回归结果表明:(薹茎+主花序)/(缩茎+伸长茎)对倒伏指数的影响最大,其次是薹茎/伸长茎。

According to the investigative data of 9 indexes and lodging index of 18 rapeseed （ Brassica napus） varieties, through stepwise regression analysis , this study gained the following regression equation： Y=-2.033 -0.052X1 ＋0.013X2 ＋0.092X4 ＋6.423X7 -4.950X8 -0.385X9, in which Y, X1, X2, X4, X7, X8 and X9 represented lodging index, plant height, bio-mass , branch height , （ bolting stem length ＋main inflorescence length ） /（ shortening stem length ＋extending stem length ） , bol-ting stem length /extending stem length , and （ bolting stem length ＋extending stem length ） /shortening stem length , respective-ly.The above regression equation showed that （ bolting stem length ＋main inflorescence length ） /（ shortening stem length ＋ex-tending stem length ） had the greatest influence on the lodging index of rapeseed , followed by bolting stem length /extending stem length.