Several problems for attention to the bioassay of cotton root cap cell with Verticillium dahliae Kleb coarse toxin were studied.

• 在棉花根冠细胞生物测定过程中,棉花黄萎病病菌通过提纯复壮而达到较强的侵染能力,并制备出较多的黄萎病菌粗毒素。