Abstract: Under rice-rapeseed rotation in the Yangzi River Basin, risk of rice herbicide residues on rapeseed production should be evaluate for selection of herbicide-tolerant rapeseed. Thus 19 rapeseed varieties were evaluat⁃ ed under pyrazosulfuron, pretilachlor, bentazone and cyhalofop herbicides stresses. Rapeseed traits were investigat⁃ ed on seed germination rate, plant height, maximum root length, fresh weight aboveground, fresh weight of roots, dry weight aboveground and root dry weight. Results showed that, under herbicide stresses, the tolerance coefficients of different genotype were significantly different. By cluster analysis, varieties were selected with relatively strong tol⁃ erance to different herbicides. It showed that comprehensive evaluation of herbicide tolerance was effective on rape⁃ seed by integration of principal component analysis, subordinative function value and clustering analysis, which could avoid bias and instability of single index analysis. It suggested a practical selecting method for rapeseed as succession crop after rice according to actual use of herbicides in rice plantation. 

Key words: color:#000000, font-family:", sans serif", ,tahoma,verdana,helvetica, font-size:12px, font-style:normal, font-weight:normal, line-height:1.5, text-decoration:none, ">color:#000000, font-family:", sans serif", ,tahoma,verdana,helvetica, font-size:12px, font-style:normal, font-weight:normal, line-height:1.5, text-decoration:none, ">Brassica napus L.；herbicide tolerance；comprehensive evaluation；pyrazosulfuron；propion? amide；bentazone；cyhalofoprin