Controlling fusarium wilt disease of cucumber plants via antagonistic microorganisms in free and immobilized states

Hammad, A.M.M.; El-Mohandes, Mohsen A.

doi:10.1016/s0944-5013(99)80002-0

Cited by 13 publications

(7 citation statements)

References 8 publications

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“…In vitro, B. mycoides completely inhibited the growth of Pythium mamillatum Meurs and F. oxysporum (Hammad and EI-Mohandes, 1999). Pandey et al (1997) MA Curtis, or Trichoderma pseudokoingii Rifai.…”

Section: Discussionmentioning

confidence: 95%

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Biological control of Aphanomyces euteiches root-rot of pea with spore-forming bacteria

Wakelin

Walter

Jaspers

et al. 2002

Austral. Plant Pathol.

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i Spore-forming bacteria were investigated as potential biological control agents of the pea root rot fungus, Aphanomyces euteiches (Oomycete). Isolations of the bacteria were made both directly from field soils (558) and from the rhizosphere of peas grown in soil (146).When the 704 isolates were screened for inhibition of A. euteiches mycelial expansion in vitro, a low frequency of suppressiveness was observed in isolates taken directly from field-soil (0.05%), whilst 19% of the bacterial isolates taken from the rhizosphere were suppressive.Mycelial suppressive isolates were subsequently screened for inhibition of zoospore germination and germ tube growth.The Seed coat, prill and granule formulations of B. mycoides MW 27 were evaluated in a field trial. As a seed coat formulation, the isolate significantly (a=0.05) increased plot stand by about 10%. In a prill formulation, B. mycoides MW 27 had no effect on plot stand (early damping-off disease), but significantly (a=0.05) increased the number of pods per plant and average pod weight per plant. Apron C70SD controlled damping-off disease but had no effect on root rot disease.Bacillus pumilus PT 10, B. mycoides MW 27, P. polymyxa 18·25 and fluquinconazole were tested as seed treatments for control of another root disease, take-all of wheat. Bacillus pumilus PT 10 significantly (a=0.05) increased plant yield by 77%. Bacillus mycoides MW 27 had similar efficacy as fluquinconazole, increasing yield by approximately 10%(not significant at a=0.05). As a seed coat treatment, B. mycoides MW 27 also effectively controlled damping-off disease.iii Paenibacillus polymyxa 18'25 suppressed a wide range of plant pathogenic fungi in vitro, possibly through production of the cell wall-degrading enzymes chitinase or cellulase, or an antibiotic compound which the bacterium was found to produce. Bacillus mycoides MW 27 was slightly suppressive to only two pathogenic fungi in vitro, and did not degrade chitin or cellulose.The soil bacterium Bacillus mycoides MW 27 has excellent potential for development as a biological control agent of Aphanomyces root rot of pea. A formulation of the bacterium could be marketed on both its ability to increase yields under Aphanomyces disease pressure, and to limit oospore development, thereby limiting disease in continuous cropping situations.

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Section: Discussionmentioning

confidence: 95%

“…et Nish. on sunflower (Kong et al, 1997), take-all of wheat (Capper and Campbell, 1986), Pythium mamillatum damping-off and Fusarium oxysporum wilt of cucumber (Hammad and EI-Mohandes, 1999).…”

Section: Vidhyasekaran and Muthamilan (1999) Also Found That The Biolmentioning

confidence: 99%

Biological control of Aphanomyces euteiches root-rot of pea with spore-forming bacteria

Wakelin

Walter

Jaspers

et al. 2002

Austral. Plant Pathol.

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“…The B. cereus group produces many extracellular compounds that include haemolysin, a soluble toxin lethal for mice, insecticidal toxin, phospholipase C and bacterial-lytic and proteolytic enzymes (Claus & Berkeley 1989, Lereclus 2000. B. mycoides, a closely related species to ACEM 32, has shown bioactive properties that have been used in the agriculture and biomedical industries (Hammad & El-Mohandes 1999, Pruss et al 1999, and can be the causative agent in agricultural infections (Grodnitskaya & Gukasyan 1999). Most of the toxins and bioactive compounds in the B. cereus group are only produced in stationary phase (Lereclus 2000).…”

Section: Firmicutesmentioning

confidence: 99%

Algicidal bacteria associated with blooms of a toxic dinoflagellate in a temperate Australian estuary

Skerratt¹,

Bowman²,

Hallegraeff³

et al. 2002

Mar. Ecol. Prog. Ser.

146

110

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Gymnodinium catenatum is an introduced toxic dinoflagellate that blooms intermittently and causes shellfish farm closure in the Huon Estuary, Tasmania, Australia. Seventy-five bacteria isolated from the estuary were tested for algicidal activity against this and other toxic and nontoxic algal species. Five isolates produced algicidal extracellular exudates. These algicidal species were a Pseudoalteromonas sp. (ACEM 4), a novel Zobellia sp. (ACEM 20), a strain of Cellulophaga lytica (ACEM 21) and 2 Firmicutes: a novel Planomicrobium sp. (ACEM 22) and a strain of Bacillus cereus (ACEM 32). This study is the first time Gram-positive bacteria have been associated with algicidal activities. Further data are presented on an algicidal Pseudoalteromonas species previously isolated from the Huon Estuary (Strain y). Supernatant produced by all 5 strains caused cell lysis and death in G. catenatum vegetative cells. No change or reversible ecdysis was noted for 2 other endemic dinoflagellate species. Algicidal or inhibitory activity was not activated via homoserine lactones, but bacterial quorum sensing for the isolates was shown by means of the AI-2 mechanism. Algicidal activity from field isolates was also influenced by strain or environmental variation. Bacteria were capable of losing or switching off their algicidal ability indicating that the presence of an algicidal species in the environment may not necessarily signify that they are currently algicidal. Concentrations of algicidal compounds required for algal lysis in laboratory experiments indicate that the 5 bacterial species can be effective against G. catenatum vegetative cells if they dominate the bacterial population in the estuary, particularly when attached to particles. KEY WORDS: Algicidal · Gymnodinium · Pseudoalteromonas · Cellulophaga · Flavobacteria · Harmful algal blooms Resale or republication not permitted without written consent of the publisher

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“…Slow release of the entrapped bacteria and the protective environment created by encapsulation on alginate (Fravel 1985;Bashan 1986), may be the reason for the initially low and subsequently higher populations of bacteria in the rhizosphere in case of alginate-based formulations. Greater ability of survival and colonization of rhizosphere by immobilized form of inoculants in comparison to free forms have been reported by Hammad & El-Mohandes (1999). For commercialization, viability of bioinoculant in a prescribed formulation for a certain period with preservation of strain characteristics is desirable (Fages 1992;Smith 1992).…”

Section: Resultsmentioning

confidence: 99%

Carrier-based Preparations of Plant Growth-promoting Bacterial Inoculants Suitable for use in Cooler Regions

Trivedi

Pandey

Palni

2005

World J Microbiol Biotechnol

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Carrier-based preparations of two plant growth-promoting rhizobacteria (PGPR) viz. Bacillus subtilis and Pseudomonas corrugata, developed in five formulations were evaluated for their growth promotion, rhizosphere colonization, and viability under storage. The effect of these formulations as fresh preparations, and after 6 months of storage at 4°C and room temperature, was also determined. The bacterial inoculants in all the formulations were found to enhance the growth parameters of the test plant species; best results were obtained in case of alginate-based formulations. Maximum numbers of inoculated bacteria were recovered from the rhizosphere of alginate-based formulation-treated plants after 6 weeks of growth. Viability of bacterial inoculants was maximal in alginate beads, and alginate beads supplemented with skim milk formulations, after 180 days of storage at 4°C.

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Controlling fusarium wilt disease of cucumber plants via antagonistic microorganisms in free and immobilized states

Cited by 13 publications

References 8 publications

Biological control of Aphanomyces euteiches root-rot of pea with spore-forming bacteria

Biological control of Aphanomyces euteiches root-rot of pea with spore-forming bacteria

Algicidal bacteria associated with blooms of a toxic dinoflagellate in a temperate Australian estuary

Carrier-based Preparations of Plant Growth-promoting Bacterial Inoculants Suitable for use in Cooler Regions

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