Functional interplay between antagonistic bacteria and Rhizoctonia solani in the tomato plant rhizosphere

Abstract

Microbial interactions with plant roots play an imperial role in tomato plant growth and defense against the Rhizoctonia solani. This study performed a field experiment with two antagonistic bacteria (Pseudomonas and Bacillus) inoculated in healthy and Rhizoctonia solani treated soil in tomato rhizosphere to understand the metabolic pattern and microbial function during plant disease suppression. In the present study, we assessed soil and microbial enzymes, bacterial and fungal cell forming unit (CFU), and carbon utilization profiling through Bio-Eco plates of rhizoplane samples. Antagonist bacteria and pathogen interaction significantly (p < 0.05) influenced the bacterial count, soil enzymes (chitinase and glucanase), and bacterial function (siderophore and chitinase production). These results indicated that these variables had an imperial role in disease suppression during plant development. Furthermore, the metabolic profiling showed that carbon source utilization enhanced under fruit development and ripening stages. These results suggested that carbon sources were essential in plant/pathogen/antagonist interaction. Substrates like β-methyl-D-glucoside, D-mannitol, D-galacturonic acid, N-acetyl-D-glucosamine, and phenylethylamine strongly connect with the suppuration of root rot disease. These carbon sources may help to propagate a healthy microbial community to reduce the pathogen invasion in the plant root system, and these carbon sources can be stimulators of antagonists against pathogens in the future.

Plant Microbiome Engineering: Hopes or Hypes

“…Whereas, they substantially contribute to production, food web interactions, and nutrient recycling. They also represent diverse moods of nutrition, such as phagotrophy, phototrophy, symbiosis, saprotrophy, or a combination of these strategies, in a given ecosystem [ 102 , 103 ].…”

Exogenous Ca/Mg quotient reduces the inhibitory effects of PEG induced osmotic stress on Avena sativa L.

“…Aslam et al (2013) investigated the morphological and physiological response of maize hybrids under drought stress. Aslam et al (2013) and Solanki et al (2022) studied drought stress tolerance in crops by using plant growth promoting rhizobacteria. Arun et al (2020) reported the mitigation of drought stress in rice crop by the application of plant growth-promoting.…”

Bacterial-Mediated Salinity Stress Tolerance in Maize (Zea mays L.): A Fortunate Way toward Sustainable Agriculture

“…PGPR colonizes the roots and improves seed germination and plant biomass production . Microorganisms alleviated abiotic stresses by modulating phytohormone levels. , Plant growth, development, and nutrient acquisition − were improved by these microbial phytohormones against various environmental stresses including both abiotic and biotic ones. − The synthesis of phytohormones is one of PGPR’s other mechanisms for promoting plant growth and alleviating salt stress . Inoculation of PGPR in plants possessing ambient stresses enhances their proline level, which ultimately leads to improved antioxidant activity, thus increasing the production of plant biomass and improved toxicity .…”