Vessel occlusion and secretory activities of vessel contact cells in resistant or susceptible cotton plants infected with Fusarium oxysporum f.sp. vasinfectum

Stimulateurs des défenses naturelles des plantes : une nouvelle stratégie phytosanitaire dans un contexte d’écoproduction durable.

“…11) et l'élaboration de barrières vasculaires incluant des gels de nature pectique, des thylles (excroissances cellulaires) et un tapissement de l'intérieur des vaisseaux du xylème par des phénols polymérisés ( Fig. 12) (Shi et al 1992).…”

Peculiar ultrastructural characteristics of fungal cells and of other elements apposed to and in vessel walls in plants of a susceptible carnation cultivar, infected with Fusarium oxysporum f.sp. dianthi race 2

“…Prominent networks (denoted alveolar) of layers, delimited by opaque bands, are also closely linked to the coating (Ibid). To our knowledge, the question concerning the origin and nature of coating in this and other wilt-affected plants has not yet been resolved adequately, despite the fact that some authors have stated that coatings may contain compounds, assigned a host origin, such as suberin, pectin, phenolics, and so on Cooper 1983, 1984;Gold and Robb 1995;Robb et al 1978;Shi et al 1992;Street et al 1986). However, with gold-complexed probes, pectin, cellulose and chitin residues were found to be of exceptional occurrence in the coating in the diseases we have studied (Ouellette et al 1999a(Ouellette et al , 2002(Ouellette et al , 2004a(Ouellette et al , 2004bRioux et al 1998).…”

“…Of the material extrinsic to mature vessel elements in many plants affected by fungal wilt diseases, opaque matter (the coating) covering vessel walls is found in most of these diseases Cooper 1983, 1984;Pegg et al 1976;Robb et al 1975Robb et al , 1979Robb et al , 1987Shi et al 1992), and considered by many to be compounds of host origin and often as an expression of resistance. Investigations of wilt of carnation (Dianthus caryophyllus L.) caused by Fusarium oxysporum Schlechtend.:Fr.…”

Tissue invasion and alteration in eggplant infected with Verticillium dahliae: A light and transmission electron microscopy study

“…A more detailed discussion on the subject is presented in Ouellette et al (2005b). May it be stressed that the OM and related components under study do not appear to simply be degradation or excretion products, and that their occurrence in periplasmic spaces may not necessarily be an expression of host cell reactions (Shi et al 1992). Indeed, again, the many long stretches of OM occurred in apparently intact middle lamellae bordering cells with still mostly normal host cell cytoplasm, or clearly different from its remnants when the cell content was completely altered.…”