Occurrence of Tomato Early Blight Disease and Associated Alternaria Species in Punjab, Pakistan

doi:10.36899/japs.2021.5.0337

Cited by 1 publication

(1 citation statement)

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“…This disease reduces the photosynthetic surface of the leaves and, in severe cases, leads to complete plant defoliation 17 . According to a field survey conducted in 2016–2017 in different regions of Pakistan, A. alternata was found to be the second most common pathogen isolated from leaves and fruits of tomato, with disease incidence ranging from 9 to 75% 18 . The main meteorological components contributing to pathogen invasion and deterioration of a tomato crop are temperature and relative humidity .…”

Section: Introductionmentioning

confidence: 99%

Rhizosphere bacteria associated with Chenopodium quinoa promote resistance to Alternaria alternata in tomato

Zahoor

Naz

Keyani

et al. 2022

Sci Rep

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Microorganisms can interact with plants to promote plant growth and act as biocontrol agents. Associations with plant growth-promoting rhizobacteria (PGPR) enhance agricultural productivity by improving plant nutrition and enhancing protection from pathogens. Microbial applications can be an ideal substitute for pesticides or fungicides, which can pollute the environment and reduce biological diversity. In this study, we isolated 68 bacterial strains from the root-adhering soil of quinoa (Chenopodium quinoa) seedlings. Bacterial strains exhibited several PGPR activities in vitro, including nutrient solubilization, production of lytic enzymes (cellulase, pectinase and amylase) and siderophore synthesis. These bacteria were further found to suppress the mycelial growth of the fungal pathogen Alternaria alternata. Nine bacterial strains were selected with substantial antagonistic activity and plant growth-promotion potential. These strains were identified based on their 16S rRNA gene sequences and selected for in planta experiments with tomato (Solanum lycopersicum) to estimate their growth-promotion and disease-suppression activity. Among the selected strains, B. licheniformis and B. pumilus most effectively promoted tomato plant growth, decreased disease severity caused by A. alternata infection by enhancing the activities of antioxidant defense enzymes and contributed to induced systemic resistance. This investigation provides evidence for the effectiveness and viability of PGPR application, particularly of B. licheniformis and B. pumilus in tomato, to promote plant growth and induce systemic resistance, making these bacteria promising candidates for biofertilizers and biocontrol agents.

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Section: Introductionmentioning

confidence: 99%