Abstract
ABSTRACT An experiment was conducted to determine the influence of arbuscular mycorrhizal (AM) fungi and Rhizobium sp. individually as well as in combinations, on the growth response of Acacia planifrons W. et A. seedlings in sterilized soil under greenhouse conditions. The native AM fungi Glomus fasciculatum (Thatcher) Gerd. & Trappe emend. Walker & Schenck & Smith emend. Koske and G. geosporum (Nicol & Gerd.) Walker were isolated from the rhizosphere of A. planifrons and multiplied in the roots of Zea mays (L.). The Rhizobium sp. was isolated from the root nodules of A. planifrons and cultured in yeast extract mannitol broth. These cultures were used to inoculate the seedlings of A. planifrons individually and in combinations. The results showed that co-inoculation of AM fungi and Rhizobium sp. increased the growth, biomass and nutrient uptake of A. planifrons more than single inoculations of AM fungi or Rhizobium sp. AM fungi and Rhizobium sp. inoculated seedlings had a higher accumulation of nitrogen (N), phosphorus (P) and potassium (K) than un-inoculated controls. The seedlings inoculated with triple root symbionts, G. fasciculatum + G. geosporum and Rhizobium sp. resulted in the maximum plant growth and nodular biomass production. Lower root to shoot ratios and increased seedling quality index were also obtained in these combinations.
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