Pakistan Journal of Biological Sciences1028-88801812-5735Asian Network for Scientific Information10.3923/pjbs.2007.1491.1495Ali BolandnazarSaheb Reza NeyshabouriMohammad AliasgharzadNasser ChaparzadehNader 92007109 The effects of three Arbuscular Mycorrhizal Fungi (AMF), Glomus versiforme, G. intraradices and G. etonicatum) and three irrigation intervals (7, 9 and 11 days) on growth of onion (Allium cepa L.) cv. Red Azar Shahr were studied under two soil conditions (sterilized and non-sterilized). The results indicated that, AMF colonization improved plant height, Leaf Area Index (LAI), total biomass, bulb dry mass and diameter, Harvest Index (HI) and chlorophyll content (p<0.001). Bulbing occurred 10-15 days earlier in mycorrhizal plants. Irrigation interval decreased biomass, LAI, Leaf Area Ratio (LAR), bulb diameter and dry mass and chlorophyll content (b and total) at 11 day irrigation interval. In term of interaction, G. versiforme at 9 day and non-mycorrhizal plants at 11 day produced the greatest and the lowest LAI (8.56 vs. 1.57), respectively. Mycorrhizal onions in contrary to non-mycorrhizal ones produced more LAI and biomass in sterilized soil and inoculation with G. etonicatum and the non-mycorrhizal onions in sterilized soil had the highest and the lowest biomass, respectively.]]>Aguilera-Gumez, L., F.T. Jr. Davies, V. Olalde_Portugal, S.A. Duray and L. Phavaphutanon,1999Glomus intraradices) on gas exchange and plant growth of chile ancho pepper (Capsicum annuum L. cv. San Luis).]]>36441449Alberte, R.S., J.P. Thornber and E.L. Fiscus,197759351353Al-Karaki, G., B. McMicheal and J. Zak,200414263269Arnon, D.I.,1949Beta vulgaris.]]>24115Brewster, J.L.,1994Charron, G., V. Furlan, M. Bernier-Carou and G. Doyon,200111187197Charron, G., V. Furlan, M. Bernier-Carou and G. Doyon,200111145150Fortunato, I.M., C. Ruta, A. Castrignano and F. Saccardo,2005106472483Furlan, V. and J.A. Fortin,1973Endogone calospora on Allium cepa under three temperature regimes.]]>100467477Hunt, R.,1982McArthur, A.J. and N.R. Knowles,1992100341351Morte, A., C. Lovisolo and A. Schubert,2000Helianthemum almeriense-Terfezia claveryi.]]>10115119Munne-Bosch, S. and L. Alerge, 2001Rosmarinus officinalis plants.]]>210925931Nelsen, C.E. and G.R. Safir, 1982107271274Phillips, J.M. and D.S. Hayman,197055158161Sanders, F.E. and P.B. Tinker,19734385395Sasa, M., G. Zahka and I. Jakobsen,198797279283Smith, F.A. and S.E. Smith,1981Trifolium subterraneum: Use of sterilized soil as a control treatment.]]>88299309Subramanian, K.S., P. Santhanakrishnan and P. Balasubramanian,2006107245253Stribley, D.P.,19901990pp: 85-101pp: 85-101Waterer, D.R. and R.R. Coltman,1988113704708