Azospirillum spp. from Crop Roots: A Promoter of Plant Growth
Nitrogen-fixing bacteria were isolated from the roots of several gramineous and non-gramineous crops in Japan, Thailand and the Philippines. All the isolates, being incapable of utilizing glucose as a sole carbon source, were identified as a species similar to Azospirillum brasilense. Some of those isolates clearly exhibited a growth-promoting effect on roots and shoots in response to inoculation to the roots of their respective host plants.