The effect of inoculation of a native PGPR isolate on
rice growth promotion, 30 days after sprouting.
(1) Plant was inoculated with SVPR30 strain;
(2) positive control (plant was irrigated with mineral fertilizer solution);
(3)negative control (plant was irrigated with distilled water);
(4) plant was inoculated with Paenibacillus polymyxa ATCC 10343 strain.
In order to test the effective contribution to plant growth of
one PGP strain isolated, the isolate SVPR30, identified by 16S
rRNA gene sequence as a strain of Bacillus sp., was chosen for in
vivo experiments. This strain was characterized as a high IAA
and siderophore producer, being also able to solubilize
phosphate and fix a considerably high amount of nitrogen.
The amount of in vitro biological nitrogen presented by this
strain was 6.8 mgNml1.
The inoculation of rice with Bacillus sp. SVPR30 strain
showed a significant increase in the roots and shoot parts of
rice plants when compared with the controls within 15 and 30
days after sprouting (Table 5 and Fig. 3).