镉和酸雨对苦楝幼苗细胞膜透性及渗透调节物质含量的影响

发布时间：2018-03-17 16:46

  本文选题：Cd　切入点：苦楝　出处：《环境科学学报》2017年11期 　论文类型：期刊论文

【摘要】：采用盆栽法研究了3个梯度模拟酸雨(p H=5.6、4.5、3.5)和不同剂量Cd2+(0、30、60、90、120、150、180 mg·kg~(-1))单一及复合处理,对苦楝(Melia azedarach L.)幼苗生长、质膜透性和主要渗透调节物质含量的影响.结果表明,p H=4.5和30 mg·kg~(-1)Cd2+复合处理对苦楝生物量的积累和幼苗的生长具有一定促进作用;p H=4.5和低剂量Cd2+(≤60 mg·kg~(-1))单一及复合处理下,株高和干重变化不显著(p0.05),叶色、叶绿素含量、相对电导率和丙二醛含量也无明显变化;而强酸雨(p H=3.5)和高剂量Cd2+(≥90 mg·kg~(-1))处理下,叶片发黄卷曲,叶绿素含量下降,相对电导率和丙二醛含量增大,且酸雨和Cd2+复合处理较单一酸雨和单一Cd2+处理毒害作用更明显,表现为复合叠加效应;随酸雨强度和Cd2+剂量的增加,可溶性糖含量下降,可溶性蛋白和游离脯氨酸含量先升后降,二者峰值均出现在p H=4.5和60 mg·kg~(-1)Cd2+处理,且Cd2+剂量≤120 mg·kg~(-1)时,各酸雨梯度下可溶性蛋白和脯氨酸含量均高于CK.综上认为,在Cd2+剂量≤60 mg·kg~(-1)、酸雨p H≥4.5的区域,苦楝可以正常生长且保持较大生物量,可将其作为Cd污染典型酸雨区的绿化和修复树种.
[Abstract]:The seedling growth of Melia azedarach L. (Melia azedarach L.) was studied by pot culture with three single and compound treatments of three gradient simulated acid rain of 5.64.5c3.5) and different dosages of Cd2 at a dose of 150mg 路kg ~ (-1) and 150mg 路kg ~ (-1) ~ (-1) ~ (-1). The effects of plasma membrane permeability and the contents of major osmotic regulatory substances on plasma membrane permeability and the contents of major osmotic regulators were studied. The results showed that the compound treatments of 4. 5 and 30 mg 路kg~(-1)Cd2 promoted the biomass accumulation and seedling growth of azadirachta azadirachta under single and compound treatments with low dose Cd2 (鈮，

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