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通过高等植物生态毒理试验,以根长、芽长和发芽率为主要测定指标,研究了镉-苯并(a)芘单一/复合污染对小麦种子萌发的影响,以考察两者复合污染的生态效应并筛选敏感毒性诊断指标。结果表明,镉与苯并(a)芘单一/复合污染条件下,小麦根伸长、芽长和发芽率均受到不同程度的影响。其中,镉单一污染条件下小麦的根长和芽长显著高于对照,表现为刺激生长效应;苯并(a)芘单一污染胁迫显著抑制了小麦根长和芽长的伸长;两者复合污染促进了小麦的生长。单一污染条件下,苯并(a)芘对小麦种子早期生长的毒害效应大于镉。两种污染物在供试浓度范围内相互作用的联合毒性效应为拮抗特征。3个指标中,小麦发芽率的指示效应最不明显。
The root length, shoot length and germination rate were taken as the main indexes to evaluate the effect of single / combined pollution of Cd-benzo (a) pyrene on the seed germination of wheat by higher plant ecotoxicological test. Ecological effects and screening of sensitive diagnostic indicators. The results showed that the root elongation, shoot length and germination rate of wheat were affected to different degrees under single / combined pollution of cadmium and benzo (a) pyrene. Among them, the root length and bud length of wheat under Cd single pollution were significantly higher than those of the control, which showed that the effect of stimulating growth was obvious. Single benzo (a) pyrene stress significantly inhibited the elongation of root length and shoot length of wheat; Pollution promotes the growth of wheat. Under single pollution, the toxic effect of benzo (a) pyrene on the early growth of wheat seeds was greater than that of cadmium. The combined toxic effect of the two pollutants interacting in the concentration range tested is antagonistic. Three indicators, the indication of the germination rate of wheat is the least obvious.