Enhancing resistance of Sesamum indicum against Alternaria sesami through Bacillus velezensis AR1.

considerable yield loss and poor quality of sesame seed are attributed to fungal pathogens including Alternaria sesami. The use of agrochemicals and few biocontrol agents have been employed to at least minimize the problem. Thus, this research work was initiated to mitigate the impact of the disease using Bacillus velezensis AR1. A total of four treatments viz., A. sesami alone, sole fungicide, AR1, and alternate application of AR1 with Dithianon (fungicide) were applied with six replications.

the result indicated that the sole and alternate application of AR1 with fungicide reduced disease severity to less than 10%. Plant physiological traits have also been improved due to the plant growth promoting AR1. Induced plant defense-related biochemicals viz., total phenolic and flavonoid contents were maximum in the plant subjected to AR1 and alternate application with a fungicide. In addition, the concentration of leaf amino acid proline has been doubled due to AR1 compared to the control. The concentration of plant growth-regulating hormones: Gibberellic acid and IAA, as well as leaf chlorophyll, total nitrogen and phosphorus contents were also significantly increased by 203.86, 7.79, 0.31 mg gFW^-1 , 0.15 and 0.13%, respectively, due to the treatments. Furthermore, postharvest soil chitinase, cellulase and 1.3, β-glucanase activity results indicated the biological control and rapid soil colonization trends of AR1.

from this broader invitro and in vivo experiment findings, B. velezensis AR1 can be recommended for biological control of plant fungal diseases for environmentally safe and quality crop production. This article is protected by copyright. All rights reserved.