In Vitro Antagonistic Activity of PGPR Against Plant Pathogen

Abstract

Wheat (Triticum aestivum L.) stands as a significant global cereal crop, providing a vital source of calories and protein for a substantial segment of the population. Nonetheless, its productivity faces growing limitations due to fungal pathogens, especially Alternaria tenuissima, responsible for leaf spot and blight. These infections result in premature leaf ageing, diminished photosynthetic efficiency, and notable reductions in both grain yield and quality. Furthermore, A. tenuissima generates mycotoxins, which present health hazards to both humans and animals via the food chain. Plant Growth-Promoting Rhizobacteria (PGPR) provide a viable and sustainable option. These advantageous soil microorganisms promote plant development and inhibit pathogens through processes including the synthesis of antifungal substances, lytic enzymes, siderophores, and the activation of systemic resistance.

The present study aims to isolate indigenous PGPR from the rhizosphere of wheat crops affected by A. tenuissima, examine their antagonistic properties in vitro, and assess their viability as biocontrol agents. The results could play a significant role in advancing sustainable methods for controlling A. tenuissima, enhancing crop resilience and productivity, and minimising dependence on chemical fungicides.