Abstract
Summary Azospirillum spp. were isolated from the roots of diverse plant species having C3, C4 and CAM photosynthetic pathways. All the cultures showed identical morphological and physiological characters despite the diversity of their origin. Attempts to identify these cultures as A. brasilense or A. lipoferum based on detailed physiological studies were unsuccessful as they showed many overlapping characters. Like A. lipoferum all the strains could utilize glucose and 2-ketoglutaric acid as sole carbon source for growth, and acidify the media containing glucose, fructose, ribose and mannitol, but like A. brasilense they did not require biotin, exhibited dissimilatory nitrate reduction, and did not show pleomorphism. Further these isolates produced indole which was not reported in either of the species. Based on these studies, it was suggested that these cultures might represent a new species of Azospirillum.
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