IAA produced from PGPR isolates could clearly promote peanut root
growth. When either isolate A20 or A45 (10 8 cells per ml) was co-inoculated with Bradyrhizobiumsp.
TAL 173 (10 8 cells per ml), the peanut root rot disease caused byA. niger(10 5 and 10 6 spores per seed)
could be inhibited. Incorporating rhizobia with selected PGPR increases nitrogen fixation and reduces
fungicide usage in peanut, providing an appropriate approach for sustainable agriculture.