3种拟除虫菊酯类杀虫剂对小白菜幼苗叶绿素和类胡萝卜素含量的影响

目的]探究拟除虫菊酯类杀虫剂对小白菜叶绿素含量的影响。方法]在人工气候培养箱中培育小白菜幼苗,至三叶一心时,用微量注射器分别用10μl不同浓度的氟氯氰菊酯、氯氟氰菊酯、溴氰菊酯处理第3片叶片,24 h后测定小白菜幼苗叶绿素和类胡萝卜素的含量。结果]氯氟氰菊酯和稀释500、1 000倍的溴氰菊酯导致小白菜幼苗叶绿素a、叶绿素b、叶绿素总量、类胡萝卜素含量、叶绿素a/b值上升;氟氯氰菊酯和稀释1 500倍的溴氰菊酯则导致小白菜幼苗叶绿素a、叶绿素b、叶绿素总量、类胡萝卜素含量下降,叶绿素a/b值上升。结论]氯氟氰菊酯和高浓度的溴氰菊酯处理对小白菜生长有促进作用,氟氯氰菊酯和低浓度的溴氰菊酯处理对小白菜生长有胁迫作用。

Effects of the Three Pyrethroid Insecticides on the Contents of Chlorophyll and Carotenoid in Pakchoi Seedling Leaves

Objective] The aim was to explore the effects of three pyrethroid insecticides on the content of chlorophyll and carotenoid in the pakchoi seedlings.Method] The pakchoi seedlings were planted in air-conditioned growth cabinets.When the seedlings had three fully expanded leaves,the third young leaf of each seedling was smeared with 10 μl different concentrations of cyfluthrin,lambda-cyhalothrin and deltamethrin,respectively.And then the chlorophyll and carotenoid contents were measured at the 24th hour.Result] The contents of Chl a,Chl b,total chlorophyll,carotenoid and the ratios of Chl a/Chl b in the pakchoi seedling leaves treated with lambda-cyhalothrin and higher concentration of deltamethrin increased.The contents of Chl a,Chl b,the total chlorophyll,carotenoid in the pakchoi seedling leaves treated with cyfluthrin and lower concentration of deltamethrin decreased,while the ratios of Chl a/Chl b increased.Conclusion] Cyfluthrin and lower concentration of deltamethrin inhibit the growth of pakchoi,while lambda-cyhalothrin and higher concentration of deltamethrin promote the growth.