Abstract
Three endemic plants rhizosphere (Astragalus gombo Coss. & Dur., Daucus sahariensis Murb., Ononis angustissima Lam.), were used for actinomycetes isolation. Ninety-three (93) isolates have been screened to evaluate their antagonistic properties against phytopathogenic microorganisms and to determine their biocontrol properties against Fusarium culmorum, especially responsible for several cereal diseases like font’s seedlings, rust, and burn of ears. Four (04) isolates (D2, D5, D8, and AST1) have been in vitro tested to determine PGPR effect and biocontrol characters of bread wheat (Triticum aestivum L.), Hidhab (HD) variety cultivated in the Murashigue and Skoog (MS) culture medium. The aim of this study is the evaluation of antagonistic isolates of pathogenic fungi F. culmorum, without and within commercial fungicide (Tebuconazole, 60 g/l) solution. Our results showed clearly that these isolates have a significant effect on seed germination and seedling growth. However, results argue that these actinomycetes isolates show a very interesting activity compared to the commercial fungicide. As a result, these bacteria isolates can be used as biocontrol agents against Fusarium wilt disease of wheat, which have a beneficial effect on growth parameters.
Highlights
Wheat is the most commonly grown crop in the world, representing a major resource for food [1]
Seed germination capacity of bread wheat (T. aestivum), Hidhab variety inoculated by actinomycetes isolates in the presence of F. culmorum showed that the percentage of both germinated seeds treated and untreated by commercial fungicide (Tebuconazole, 60 g/l) exceeds 85%, so there is a significant effect of treatment by fungicide
Antagonistic activities of four actinomycetes isolate from rhizospheric soil of three (3) endemic plants in Algeria, against F. culmorum which is a causal agent of Fusarium disease and biological control mechanisms for (T. aestivum L.) variety (HD) seeds, treated and untreated with commercial fungicide (Tebuconazole 60 g/l)
Summary
Wheat is the most commonly grown crop in the world, representing a major resource for food [1]. Wheat and other small grain cereals may be attacked by a wide range of Fusarium spp., so Fusaria have long been recognized as pathogens of many plant species [2]. Pathogenic fungi can survive for a long time in the soil, and it is difficult to be controlled [5]. Biological control is a promising method that involves antagonistic microorganisms like actinomycetes. These uses are deemed to apply the best form of living cells because of their ability to colonize plant roots, to control microorganisms plant pathogens and spores shaped adapted to stable products formation [9] [10]
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