Abstract
One hundred bacteria, isolated from rhizospheric soil and rhizoplane of healthy soybean plants, were assayed for antifungal activity against six Phytophthora sojae isolates. Nine of the tested bacteria inhibited the hyphal growth of P. sojae in vitro. They were subsequently evaluated for their in vitro traits and identified using the 16S rRNA gene sequences. Four of them (Paenibacillus sp.,—S1; Streptomyces sp.,—S9, S10 and S11) were further selected on the basis of their strongest antagonistic activity in vitro against P. sojae race 4, the predominant race in most growing soybean areas in Canada, and tested for their beneficial effects on soybean plants in the greenhouse. Results showed that application of bacterial strain S11 as seed coating reduced the disease severity by 57.1% and increased the root and shoot weight by and 140 and 108% respectively, in comparison to the diseased control. Overall, a positive correlation was recorded between the in vitro and in planta effects of the selected bacteria. This is promising for further application as select environmentally safe biological control agents in the protection of soybean against root rot diseases.
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This research was supported financially by the Manitoba Pulse and Soybean Growers Association and the Canada-Manitoba Growing Forward 2 Growing Innovation - Capacity and Knowledge Development Program.
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Arfaoui, A., Adam, L.R., Bezzahou, A. et al. Isolation and identification of cultivated bacteria associated with soybeans and their biocontrol activity against Phytophthora sojae. BioControl 63, 607–617 (2018). https://doi.org/10.1007/s10526-018-9873-9
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DOI: https://doi.org/10.1007/s10526-018-9873-9