Symptomless infection of tomato plants by tomatinase producing Fusarium oxysporum formae speciales nonpathogenic on tomato plants

Ito, Shin; Nagata, Ayumi; Kai, Tomoyo; Takahara, Hiroyuki; Tanaka, Shuhei

doi:10.1016/j.pmpp.2005.07.002

Cited by 19 publications

(6 citation statements)

References 31 publications

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“…The sugar chain attached to C-3 is usually critical for both the membrane-permeabilizing and antifungal properties of saponins, and removal of these sugar residues often results in loss of biological activity (Keukens et al, 1995;Armah et al, 1999). The saponin tomatine has been thought to form a complex with membrane sterols with free 3β-hydroxyl groups of fungi, and the complexes result in pore formation and loss of membrane integrity (Ito et al, 2005).…”

Section: Trans-caftaric Trans-and Cis-cautaric and Trans-cou-mentioning

confidence: 99%

Induced plant secondary metabolites for phytopatogenic fungi control: a review

Ribera

Zúñiga

2012

J. Soil Sci. Plant Nutr.

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Pathogenic fungi constitute one of the main infectious agents in plants, causing alterations during developmental stages including post-harvest. Phytopathogenic fungi are controlled by synthetic fungicides; however, the use of these is progressively restricted due to both, the harmful effects of pesticides on the environment and human health and the appearance of highly resistant fungal strains. Therefore, there is a great demand for novel natural fungicides. Higher plants are rich source of bioactive secondary metabolites of wide variety such as tannins, terpenoids, saponins, alkaloids, flavonoids, and other compounds, reported to have in vitro antifungal properties. Thus, secondary metabolites with antifungal activity represent an alternative for achieving a sustainable control of phytopathogenic fungi and to reduce the heavy reliance of synthetic pesticides used to control them. Plant antifungal metabolites may be preformed inhibitors that are present constitutively in healthy plants (phytoanticipins), or they may be synthesized de novo in response to pathogen attack or another stress conditions (phytoalexins). These molecules may be used directly or considered as a precursor for developing better fungicidal molecules. This review presents a selection of antifungal agents induced in plants during fungal attack that can be potentially used for phytopathogenic fungi control in crops.

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Section: Trans-caftaric Trans-and Cis-cautaric and Trans-cou-mentioning

confidence: 99%

Induced plant secondary metabolites for phytopatogenic fungi control: a review

Ribera

Zúñiga

2012

J. Soil Sci. Plant Nutr.

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“…This enzyme detoxifies the tomato phytoanticipin a tomatine, which triggers programmed cell death in F. oxysporum f. sp lycopersici (Ito et al, 2007), and also suppresses the induced responses of the host (Ito et al, 2004). The ability to produce tomatinase is associated with the capacity of some nonpathogenic strains to colonize the stem of tomato (Ito et al, 2005).…”

Section: Review 533mentioning

confidence: 99%

“…, 2004). The ability to produce tomatinase is associated with the capacity of some nonpathogenic strains to colonize the stem of tomato (Ito et al. , 2005).…”

Section: The Protective Strains Of F Oxysporum: An Unexplored Mmentioning

confidence: 99%

Microbiological control of soil‐borne phytopathogenic fungi with special emphasis on wilt‐inducingFusarium oxysporum

et al. 2009

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Contents Summary 529I.Biological control of plant diseases: state of the art 530II.Main modes of action of biological control agents 530III.The protective strains of F. oxysporum: an unexplored model 532IV.Future directions for the study of the protective capacity of strains of F. oxysporum 539V.How to make biological control successful in the field? 540References 541 Summary Plant diseases induced by soil‐borne plant pathogens are among the most difficult to control. In the absence of effective chemical control methods, there is renewed interest in biological control based on application of populations of antagonistic micro‐organisms. In addition to Pseudomonas spp. and Trichoderma spp., which are the two most widely studied groups of biological control agents, the protective strains of Fusarium oxysporum represent an original model. These protective strains of F. oxysporum can be used to control wilt induced by pathogenic strains of the same species. Exploring the mechanisms involved in the protective capability of these strains is not only necessary for their development as commercial biocontrol agents but raises many basic questions related to the determinism of pathogenicity versus biocontrol capacity in the F. oxysporum species complex. In this paper, current knowledge regarding the interaction between the plant and the protective strains is reviewed in comparison with interactions between the plant and pathogenic strains. The success of biological control depends not only on plant–microbial interactions but also on the ecological fitness of the biological control agents.

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“…Our observations that the TPGs exhibit antifungal activities could be explained by the membranolytic action through which these compounds are able to interfere with the normal growth of plant pathogenic fungi. Saponins haven been known to form a complex with sterol or other membrane components which results in a change in the permeability or a disruption of the fungal cell membrane 38 . Therefore, the inhibitory effect of saponins may vary depending on the microorganisms.…”

Section: Discussionmentioning

confidence: 99%

Identification of novel compounds, oleanane- and ursane-type triterpene glycosides, from Trevesia palmata: their biocontrol activity against phytopathogenic fungi

Kim

Han

Ngo

et al. 2018

Sci Rep

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Plants contain a number of bioactive compounds that exhibit antimicrobial activity, which can be recognized as an important source of agrochemicals for plant disease control. As part of our search for new antimicrobial agents from natural sources, we found that a crude methanol extract of Trevesia palmata exhibited a promising antifungal activity against phytopathogenic fungi, such as Magnaporthe oryzae and Botrytis cinerea. Furthermore, based on activity-guided fractionation, we isolated five antifungal compounds from the methanol extract of T. palmata: two new triterpene glycosides (TPGs), TPG1 (hederagenin-3-O-β-D-glucopyranosyl-(1 → 3)-α-L-rhamnopyranosyl-(1 → 2)-α-L-rhamnopyranosyl-(1 → 2)-α-L-arabinopyranoside) and TPG5 (3-O-α-L-rhamnopyranosyl asiatic acid), along with three known TPGs (TPG2 [macranthoside A], TPG3 [α-hederin], and TPG4 [ilekudinoside D]). The chemical structures of the TPGs were determined by spectroscopic analyses and by comparison with literature data. An in vitro antifungal bioassay revealed that except for TPG4 (ilekudinoside D; IC50 >256 μg/ml), the other TPGs exhibited strong antifungal activities against the rice blast pathogen M. oryzae with IC50 values ranging from 2–5 μg/ml. In particular, when the plants were treated with compound TPG1 (500 μg/ml), disease control values against rice blast, tomato grey mold, tomato late blight, and wheat leaf rust were 84, 82, 88, and 70%, respectively, compared to the non-treatment control. Considering the in vitro and in vivo antifungal activities of the TPGs and the T. palmata methanol extracts, our results suggest that T. palmata can be a useful source to develop new natural fungicides.

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Symptomless infection of tomato plants by tomatinase producing Fusarium oxysporum formae speciales nonpathogenic on tomato plants

Cited by 19 publications

References 31 publications

Induced plant secondary metabolites for phytopatogenic fungi control: a review

Induced plant secondary metabolites for phytopatogenic fungi control: a review

Microbiological control of soil‐borne phytopathogenic fungi with special emphasis on wilt‐inducingFusarium oxysporum

Identification of novel compounds, oleanane- and ursane-type triterpene glycosides, from Trevesia palmata: their biocontrol activity against phytopathogenic fungi

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