Induced resistance in tomato plants against Fusarium wilt invoked by Fusarium oxysporum f.sp. dianthi

Kroon, B. A. M.; Scheffer, R. J.; Elgersma, D. M.

doi:10.1007/bf03041387

Cited by 50 publications

(24 citation statements)

References 7 publications

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“…In terms of an induced immune response, the importance of a period of one to several days between induction of the plant's defense mechanisms by diverse biocontrol agents and the addition of the pathogen has been previously observed (Biles and Martyn 1989;Kroon et al 1991) thus, maximal induced immune response may not have been realized in the present study.…”

Section: Response To Compost Amendment In Split-root Systemsmentioning

confidence: 70%

Fusarium oxysporum f. sp. lycopersici and compost affect tomato root morphology

Morauf

Steinkellner

2015

Eur J Plant Pathol

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The suppressive influence of compost towards the soil-borne fungus Fusarium oxysporum f. sp. lycopersici on tomatoes with special emphasis on root morphological modifications was examined. Roots of inoculated and non-inoculated tomato plants, grown in three different substrates (control, 20 % compost and 40 % compost), were scanned and analyzed in order to identify their morphological traits. To examine a potential systemic effect of compost, the plants were placed in individual pots or in split-root systems. Obtained results showed that F. oxysporum f. sp. lycopersici caused decreased root lengths and reduced root weight, root surface area and root volume. Furthermore, an increase in fine root fraction and specific root length was observed in inoculated plants. Substrate containing 20 % compost had a clear stabilizing effect towards pathogenrelated changes of the root morphology and was best able to mitigate below-ground symptoms on plants cultivated in individual pots. The morphology of roots grown in split-root systems was not directly affected by the presence of F. oxysporum f. sp. lycopersici, but complex interactions between the pathogen and the substrate were observed, strongly depending on which substrate was inoculated. These results indicated that soil amendment with compost in moderate amounts contributes to plant health and could provide an alternative to peat based substrates in sustainable production systems.

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Section: Response To Compost Amendment In Split-root Systemsmentioning

confidence: 70%

Fusarium oxysporum f. sp. lycopersici and compost affect tomato root morphology

Morauf

Steinkellner

2015

Eur J Plant Pathol

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“…lycopersici was possible and fungal antagonism in soil or on the root surface could not be excluded. Only Kroon et al (1991) described resistance against FOL in tomato plants induced by Fusarium oxysporum f.sp. dianthi avoiding a direct interaction between both the fungi.…”

Section: Discussionmentioning

confidence: 99%

**Involvement of resistance induction by Penicillum oxalicum in the biocontrol of tomato wilt**

Cal¹,

Pascual²,

Melgarejo³

1997

Plant Pathology

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Penicillium oxalicum, a biocontrol agent for Fusarium oxysporum f.sp. lycopersici, was tested for its ability to induce resistance against tomato wilt. P. oxalicum and F. oxysporum f.sp. lycopersici were placed at separate sites on tomato plants or in soil, avoiding a direct interaction between the fungi. P. oxalicum induced resistance as expressed by a reduction in disease severity, area under disease progress curve and stunting induced by the pathogen. P. oxalicum colonized the tomato rhizosphere during the experiments but it was not detected inside stems, demonstrating that P. oxalicum and Fusarium oxysporum f.sp. lycopersici remained spatially separated. Biological control was observed both in sensitive and ‘resistant’ cultivars, indicating the role of a general resistance mechanism. In both cultivars P. oxalicum treatment alone did not produce disease symptoms. Therefore P. oxalicum could be a suitable biocontrol agent in cases of cultivar resistance failure. These results suggest that P. oxalicum can trigger defence mechanisms in the plant.

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“…More and more studies are devoted to SIR in the host plant after application of biological control agents. Where soilborne pathogens are concerned, papers report experiments where a non-pathogenic strain applied to some roots of a host plant can delay symptom expression induced by the pathogen when separately applied to other roots (split-root system) or directly into the stem of the plant (Biles and Martyn, 1989;Mandeel and Baker, 1991;Kroon et al, 1992;Olivain et al, 1995;Fuchs et al, 1997;Larkin and Fravel, 1999). Since there is no direct interaction between the two microorganisms, the observed disease reduction is attributed to increased plant defence reactions in response to root colonization by the non-pathogenic strain.…”

Section: Systemic Induced Resistance (Sir)mentioning

confidence: 99%

Biological Control of Plant Diseases: The European Situation

2006

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The most common approach to biological control consists of selecting antagonistic microorganisms, studying their modes of action and developing a biological control product. Despite progress made in the knowledge of the modes of action of these biological control agents (BCAs), practical application often fails to control disease in the fields. One of the reasons explaining this failure is that the bio-control product is used the same way as a chemical product. Being biological these products have to be applied in accordance with their ecological requirements. Another approach consists of induction of plant defence reactions. This can be done by application of natural substances produced by or extracted from microorganisms, plants, or algae. Since they do not aim at killing the pathogens, these methods of disease control are totally different from chemical control. Although promising, these methods have not been sufficiently implemented under field conditions. A third approach consists of choosing cultural practices that might decrease the incidence or severity of diseases. These methods include the choice of an appropriate crop rotation with management of the crop residues, application of organic amendments and the use of new technology such as the biological disinfestation of soils. Biological control practices need an integrative approach, and more knowledge than chemical control.

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Induced resistance in tomato plants against Fusarium wilt invoked by Fusarium oxysporum f.sp. dianthi

Abstract: Tomato plants, susceptible toFusarium oxysporum f. sp. lycopersici, were inoculated by immersing the roots in a conidial suspension ofF.

Cited by 50 publications

References 7 publications

Fusarium oxysporum f. sp. lycopersici and compost affect tomato root morphology

Fusarium oxysporum f. sp. lycopersici and compost affect tomato root morphology

**Involvement of resistance induction by Penicillum oxalicum in the biocontrol of tomato wilt**

Biological Control of Plant Diseases: The European Situation

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