The growth and infection levels in mycorrhizal Lavandula, Lycopersicum and Medicago plants were compared after treatment with preparations from Rhizobium, Azotobacter and phosphobacteria (a Pseudomonas). The bacterial cultures are known to contain growth substances. Ceil-free supernatants and in some instances, the whole bacterial culture, behaved as the pure plant hormone in improving dry weight and infection levels compared with mycorrhizal control plants.
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