Accumulation of mansonones E and F in Ulmus Hollandica infected with Ceratocystis ulmi

Overeem, J. C.; Elgersma, D. M.

doi:10.1016/s0031-9422(00)85345-5

Cited by 46 publications

(25 citation statements)

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“…However, the inhibition of fungal growth on water agar containing mansonones was less effective (DUMAS et al, unpubhshed data). OVEREEM and ELGERSMA (1970) also reported the relative insensitivity of O. nlmi to mansonones when compared to other fungal species grown on nutrient agar medium eontaming mansonone E or F. We observed that there was a quicker drop of inhibition of isolate CESS16K than that of isolate Q311 after the isolates grew on mansonone agar medium over 3 days (data not shown), as if the aggressive isolate CESS16K were developing a tolerant mechanism. These results urged the necessity of seeking the way in which we would be able to evaluate the effect of mansonone E in vivo.…”

Section: Discussionmentioning

confidence: 51%

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Toxic effects of elm phytoalexin mansonones on Ophiostoma ulmi, the causal agent of dutch elm disease

Jeng

Hubbes

1989

European Journal of Forest Pathology

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Section: Discussionmentioning

confidence: 51%

“…There are reports on the toxicity of mansonones on fungi on TLC plates and in agar media (OVEREEM and ELGERSMA 1970;DUMAS et al 1983). However, little is known of the ultrastructural and physiological effects of mansonones on O. ulmi.…”

Section: Introductionmentioning

confidence: 99%

Toxic effects of elm phytoalexin mansonones on Ophiostoma ulmi, the causal agent of dutch elm disease

Jeng

Hubbes

1989

European Journal of Forest Pathology

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“…This leads us to speculate that compounds inhibitory to the pathogen may be involved in resistance. This assumption has not been suggested by other investigators (5,16). In this paper, we report the differential accumulation of inhibitory substances against the growth of ati aggressive strain of C. ulmi in American elm seedlings, after conditioning inoculation with a non-aggressive strain of the same pathogen.…”

Section: Introductionmentioning

confidence: 59%

Presence and accumulation of fungitoxic substances against Ceratocystis ulmi in Ulmus americana: possible relation to induced resistance¹

Jeng

Alfenas

Hubbes

et al. 1983

European Journal of Forest Pathology

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“…Mansonones induced in Ulmus spp. following challenge with Ophiostoma ulmi had little activity in vitro against this fungus (Overeem & Elgersma, 1970;Elgersma & Overeem. 1971).…”

Section: (I) Induced Antimicrobial Compounds (Phytoalexins Jmentioning

confidence: 99%

Antimicrobial defences in the wood of living trees

1996

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summary The wood (xylem) in a living tree is protected from microbial attack by the secondary plant surface (periderm and rhytidome), which provides an effective barrier preventing the entry of most potential pathogens, and by constitutive and induced defence mechanisms in the bark (cortex and phloem). Although a few pathogens are able To penetrate these outer tissues directly, most xylem pathogens gain entry through wounds that expose this tissue and render it more vulnerable to attack. In functional sapwood, microbial colonization might be restricted by active defence mechanisms, or by passive microenvironmental restriction consequent upon the high water content and low availability of O2 in healthy conductive xylem. These factors are not mutually exclusive: indeed, they may operate in concert in many host‐pathogen interactions. Sapwood lesions made by wood‐decaying fungi are characteristically bounded by multiccllular walls OT barrier zones (compartmentalization wall 4 barriers and reaction zones (column boundary layers)), which may function both as inhibitory or degradation‐resistant barriers to further pathogen spread, and as seals to maintain xylem function and prevent the drying and aeration that could predispose to further infection. A range of putative antimicrobial defence mechanisms contributing to the effectiveness of such barriers has been identified in sapwood tissues. This includes cell wall alterations, constitutive and induced antimicrobial compounds, necrotic responses of living cells and the deposition of gummy materials, often resinous or polyphenolic, at the host‐pathogen interface. Nutritional, environmental and anatomical features of living wood might also contribute to pathogen restriction. Although there might be differences in detail, the defences operating in gymnospenns and angiosperms are generally similar. Defence responses against a variety of pathogen categories also have much in common. Dynamic studies are crucial in elucidating the roles of the various components of the host‐pathogen interaction in the wood of living trees. A model for the protection and defence of xylem tissues in woody angiosperms is suggested, based largely upon results from dynamic studies of host‐pathogen interactions in the wood of sycamore (Acer pseudoplatanus L.).

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Accumulation of mansonones E and F in Ulmus Hollandica infected with Ceratocystis ulmi

Cited by 46 publications

References 9 publications

Toxic effects of elm phytoalexin mansonones on Ophiostoma ulmi, the causal agent of dutch elm disease

Toxic effects of elm phytoalexin mansonones on Ophiostoma ulmi, the causal agent of dutch elm disease

Presence and accumulation of fungitoxic substances against Ceratocystis ulmi in Ulmus americana: possible relation to induced resistance¹

Antimicrobial defences in the wood of living trees

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Accumulation of mansonones E and F in Ulmus Hollandica infected with Ceratocystis ulmi

Cited by 46 publications

References 9 publications

Toxic effects of elm phytoalexin mansonones on Ophiostoma ulmi, the causal agent of dutch elm disease

Toxic effects of elm phytoalexin mansonones on Ophiostoma ulmi, the causal agent of dutch elm disease

Presence and accumulation of fungitoxic substances against Ceratocystis ulmi in Ulmus americana: possible relation to induced resistance1

Antimicrobial defences in the wood of living trees

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Presence and accumulation of fungitoxic substances against Ceratocystis ulmi in Ulmus americana: possible relation to induced resistance¹