Jamal-Abad Azam Khalighi, Khara Jalil
Department of Biology, Faculty of Sciences, Urmia University, Urmia, Iran.
Pak J Biol Sci. 2007 Dec 1;10(23):4279-82. doi: 10.3923/pjbs.2007.4279.4282.
Soil pollution by heavy metals has become a critical environmental concern due to its potential adverse ecological effects. In this study we have investigated the effect of arbuscular mycorrhizal fungus (Glomus veruciforme) on some physiological growth parameters, such as chlorophyll content, amount of total soluble sugar and total protein of wheat plants (Triticum aestivum L. cv. Azar2) and we compared these factors in mycorrhizal (AM) and non-mycorrhizal (non-AM) plants. The content of chlorophyll in the absence of Cd in AM-plants was higher than non-AM plants. In the presence of mycorrhiza the content of chlorophyll a and b was decreased by increase in Cd concentration in both AM and non-AM plants. Furthermore, the amount of total soluble sugars and total proteins of shoots and roots have been increased in parallel to exogenous Cd concentration. In roots of AM-plants, the increase of soluble sugars was more dramatic in the presence of 2500 microm, but in the roots of non-AM plants this increase was step-by-step. The increase of total soluble sugars was gradually and significant in shoots of both AM and non-AM plants. The content of total proteins in shoots was raised with the increased level ofCd treatment, gradually and non-significantly.
重金属对土壤的污染因其潜在的不利生态影响已成为一个关键的环境问题。在本研究中，我们调查了丛枝菌根真菌（珠状巨孢囊霉）对一些生理生长参数的影响，如小麦植株（普通小麦品种阿扎尔2）的叶绿素含量、总可溶性糖含量和总蛋白含量，并比较了菌根（AM）植株和非菌根（non-AM）植株中的这些因素。在不添加镉的情况下，AM植株中的叶绿素含量高于非AM植株。在有菌根的情况下，AM和非AM植株中叶绿素a和b的含量均随镉浓度的增加而降低。此外，地上部和根部的总可溶性糖和总蛋白含量均随外源镉浓度的增加而增加。在AM植株的根部，当镉浓度为2500微摩尔时，可溶性糖的增加更为显著，但在非AM植株的根部，这种增加是逐步的。在AM和非AM植株的地上部，总可溶性糖的增加都是逐渐且显著的。地上部总蛋白含量随镉处理水平的提高而逐渐升高，但不显著。
