ستاره امانی فر - دانشکده کشاورزی دانشگاه تبریز
ناصر علی اصغرزاد - دانشکده کشاورزی دانشگاه تبریز
نصرت اله نجفی - دانشکده کشاورزی دانشگاه تبریز
شاهین اوستان - دانشکده کشاورزی دانشگاه تبریز
صاحبعلی بلندنظر - دانشکده کشاورزی دانشگاه تبریز

Arbuscular mycorrhizal fungi in association with plant roots may affect plant growth, nutrition and tolerance to heavy metals in polluted soils. Therefore, this association can play an important role in phytoremediation. In this study,theeffects of two arbuscular mycorrhizal fungi species including Glomus intraradices and Glomus mosseae, on the uptake and translocation of Pb in sorghum, were investigated under greenhouse conditions. The experiment was conducted as factorial, completely randomized design including four levels of Pb۲+ (۰, ۲۰۰, ۴۰۰ and ۶۰۰ mg Pb۲+ kg-۱) and three treatments of fungi (two mycorrhizal fungi species and a non-mycorrhizal plant) with four replications. Lead were added to the pots as Pb(NO۳)۲.The Results indicated that symbiosis with G. intraradices increased shoot dry weight at ۲۰۰ and root dry weight at ۴۰۰ and ۶۰۰ mg Pb kg-۱ compared to the non-mycorrhizal treatment. There were, however, no significant effects on other growth parameters. Both mycorrhizal fungi caused a significant decrease in Pb۲+ translocation from the root to the shoot. However, the shoot and root dry weights, leaf area and chlorophyll content in plants inoculated with G. mosseae at higher levels of Pb۲+ were considerably (p<۰.۰۵) decreased compared to the non-mycorrhizal plants. At pb levels of ۴۰۰ and ۶۰۰ mgkg-۱, the ratio of Pb concentration in root to that of shoot in plants inoculated with G. mosseae was significantly (p<۰.۰۵) greater than that of plants inoculated with G. intraradices and none inoculated ones.

سرب, سورگوم, فلز سنگین, گیاه پالایی, میکوریز آربوسکولار