The Arbuscular Mycorrhizal Fungi Status of Some Poplar Clones in Guilan

The abundance of spores and roots colonization by arbuscular mycorrhizal fungi was investigated in the poplar clones planted at the Safrabasteh Poplar Research Station and Kolakavar of Syahkal. The experimental design was a randomized-block with factorial combinations of two sites and four clones as a)Populus euramericana 45/51 b) Populus euramericana I-214 c)Populus deltoids 77/51 and d) Populus deltoids 69/55 in three block. The results showed that most AM spores belong to Glomus mosseae and Glomus intraradices in addition AM spore population and colonization were higher in Safrabasteh than Syahkal. The higher density of AM spore and root colonization found on P.d 77/51 and P.e. 45/51 clones. The interaction effects of poplar clones and site were not significantly on root colonization. This means that AM spore number alone was not as an index for determination of activity and mycorrhizal inoculums potentials and environmental and geographical conditions had important roles for root colonization by AM fungi.