Paenibacillus terrae AY-38 resistance against Botrytis cinerea in Solanum lycopersicum L. plants through defence hormones regulation
Kim, Ah-Young | Shahzad, Raheem | Kang, Sang-Mo | Khan, Abdul Latif | Lee, Seok-min | Park, Yeon-Gyeong | Lee, Won Hee | Lee, In-Jung
This study aims to investigate the role of Paenibacillus terrae AY-38 to produce bioactive metabolites and to counteract pathogenic infections caused by B. cinerea. The pure culture of P. terrae (AY-38) showed the secretion of significant amount of IAA (indole-3-acetic acid) (109.57 ± 3.2 µg mL⁻¹). The AY-38 strain also produced siderophore and glucanase, while in the in vitro test, it showed significant antagonism to Botrytis cinerea. In the in vivo plant experiment, the sole application of AY-38 significantly improved plant growth (plant height and leaf area), while in B. cinerea infected plants, AY-38 inoculation not only decreased the disease incidence on leaves and fruits but also reprogramed the plants for higher growth. AY-38 treatments promoted and rescued plant growth by modulating the defence responses of endogenous hormones, such as jasmonic and salicylic acids. Our findings concluded that P. terrae possesses great potential as a possible biocontrol agent against B. cinerea-induced pathogenic infections.
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