The capacity of four bacterial strains isolated from productive soil potato fields to solubilize tricalcium phosphate on Pikovskaya agar or in a liquid medium was evaluated. A bacterial strain was selected to evaluate in vitro capacity of plant-growth promotion on Solanum tuberosum L. culture. Bacterial strain A3 showed the highest value of phosphate solubilization, reaching a 20 mm-diameter halo and a concentration of 350 mg/l on agar and in a liquid medium, respectively. Bacterial strain A3 was identified by 16S rDNA analysis as Bacillus pumilus with 98% identity; therefore, it is the first report for Bacillus pumilus as phosphate solubilizer. Plant-growth promotion assayed by in vitro culture of potato microplants showed that the addition of bacterial strain A3 increased root and stems length after 28 days. It significantly increased stem length by 79.3%, and duplicated the fresh weight of control microplants. In this paper, results reported regarding phosphorus solubilization and growth promotion under in vitro conditions represent a step forward in the use of innocuous bacterial strain biofertilizer on potato field cultures.
Background and aims Plant Growth Promoting Rhizobacteria can make available phosphorus (P) for crops of economic and food importance such as Solanum tuberosum L. (potato), allowing the application of fertilizers to be reduced. The aim was evaluate the integral effect of Bacillus pumilus (phosphate solubilizer) alone and with 30 kg P/ha, as well as a conventional fertilization of 60 kg P/ha on growth, production and sprouting of potato under greenhouse conditions. Methods Five treatments were assayed: NPK 100% (T1), NK 100% (T2), B. pumilus, BP (T3), BP + NPK 50% (T4), BP + NK 50% (T5). To measure the efect of mixture bacteria and fertilizer on crop development, we recorded plant height, fresh and dry weights, number of internodes, SPAD values, fresh weight of tubers, total number of tubers, number of tubers with diameters greater than or equal to 15 mm, length and width of sprouts. Results Potato growth parameters indicated a similarity in: plant height (21.65 cm, 20.95 cm), number of internodes (12.42, 13.11), fresh (9.97 g, 5.53 g) and dry weights (1.87 g, 1.08 g) of the treatments T1 and T4, respectively. In mini-tuber production and sprouting, tuber fresh weight (g), number of total tubers, tuber diameter ≥ 15 mm, and sprout width were statistically significant at T4 respect to treatment with B. pumilus alone. Conclusion Compared to conventional mineral fertilization B. pumilus with 50% mineral fertilizer, have equal effect on plant growth values of potato, production and sprouting of mini tubers.
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