溴氰菊酯对黄瓜光合色素、叶绿素酶和氨基乙酰丙酸合酶活性的影响

EFFECTS OF DALTAMETHRIN ON PHOTOSYNTHETIC PIGMENTS AND ACTIVITIES OF CHLOROPHYLLASE AND δ AMINOLEVULINATE SYNTHASE IN CUCUMBER LEAVES

２００ｍｇ·Ｌ－１的溴氰菊酯喷施三叶期的黄瓜幼苗１０ｄ后，体内叶绿素总量下降４４．６２６％；叶绿素ａ／ｂ比值从２．７３６下降到２．５４０；类胡萝卜素含量则比对照升高９３．４２２％．用５０到５００ｍｇ·Ｌ－１的溴氰菊酯喷施黄瓜４ｄ后，叶绿素总量比对照下降７．０８０％～３０．５４６％；叶绿素ａ含量比对照下降９．９０８％～３３．４８６％；叶绿素ｂ含量比对照下降０％～２２．３９２％．３００ｍｇ·Ｌ－１溴氰菊酯使类胡萝卜素含量增加８３．３５８％．用５０～５００ｍｇ·Ｌ－１的溴氰菊酯喷施幼苗时，体内叶绿素酶活性升高１２．３１１％～３８．２５６％；δ－氨基乙酰丙酸合酶活性则下降２．７０５％～２２．８５８％．该文讨论了溴氰菊酯影响黄瓜叶绿素含量的机理．

Ten days after cucumber seedlings were sprayed with 200 mg·L -1 deltamethrin,the total content of chlorophyll decreased by 44 626%;the contents of chlorophyll a and b also decreased. The ratio of chlorophyll a/b was reduced from 2 736 to 2 540. The content of carotenoids increased by 93 422% over the control.At the fourth day after the cucumber seedlings were sprayed with 50～500mg·L -1 deltamethrin,the content of total chlorophyll decreased by 7 080%～30 546%; the content of chlorophyll a decreased by 9 908%～33 486%; the content of chlorophyll b decreased by 0～22 392%. Deltamethrin at a concentration of 300 mg·L -1 increased the content of carotenoids by 83 358%. When the seedlings were treated with 50～500 mg·L -1 deltamethrin,the activity of chlorophyllase increased by 12 311%～38 256%; but the activity of δ aminolevulinate synthase decreased by 2 705%～22 858%. The mechanism of the influence of deltamethrin on chlorophylls was discussed in the paper.