Mycorrhizal fungi increase water and nutrient elements absorption to the plant and plant provide carbohydrates for the fungus and this is beneficial for both parties . Many plants need to these fungi for absorption some mineral elements and resistance to environmental stresses such as drought, soil contamination to heavy metals such as lead, zinc and cadmium. Some soil borne bacteria have been identified as third part of the mycorrhiza, which cause improving the performance of this symbiotic relationship, and have been named as mycorrhiza helper bacteria.

Keywords: Bacterium, Fungus, Symbiosis, Pseudomonas, Gigaspora

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