Abstract:Résumé.-Les maladies vasculaires entraînent chez les plantes des modifications importantes au rùveau du xylème caulinaire ; une «gommose vasculaire» plus ou moins intense et colorée et (ou) une thyllose les caractérisent. Ces modifications structurales sont décrites dans plusieurs couples hôte-parasite chez les plantes sensibles ou résistantes après infections expérimentales. Dans tous les cas, les cellules de contact qui ne présentent normalement pas de structures sécrétrices en acquièrent rapidement lorsqu'e… Show more
“…platani excretes cell wall degrading enzymes (URITANI and STAHMANN 1961;DAMBRA et al 1977;MUTTO et al 1978) suggesting in our case the action of hydrolytic enzymes on wall polymers of tyloses responsible for their senescence. During gel formation, various events would be involved such as (i) release of cell wall components from tylose wall and pit membranes, (ii) discharge of tylose contents and (iii) direct gel secretion from adjacent parenchymal cells through the pits, as previously reported in other plants (STREET et al 1986;LE PiCARD and EL MAHJOUB 1987).…”
Section: Discussionmentioning
confidence: 88%
“…Vessel pit thickening and closing at an advanced stage of the disease was also observed. This, as shown in various vascular diseases, is related to increased metabolic activity of vessel associated cells leading to synthesis of wall polymers, such as lignins, and wall insolubilization of phenolic compounds (CATESSON et al 1972;CZANINSKI et al 1975;ROBB et al 1979b;LE PICARD and EL MAHJOUB 1987;CHERIF et al 1991). This wall thickenings form physical and chemical barriers and contribute to horizontal restriction of fungal colonization.…”
Vascular modification of plane tree seedlings inoculated with Ceratocystis fimbriata f. sp. platani, the canker stain disease agent, were characterized using histochemical and scanning electron microscopy methods.
“…platani excretes cell wall degrading enzymes (URITANI and STAHMANN 1961;DAMBRA et al 1977;MUTTO et al 1978) suggesting in our case the action of hydrolytic enzymes on wall polymers of tyloses responsible for their senescence. During gel formation, various events would be involved such as (i) release of cell wall components from tylose wall and pit membranes, (ii) discharge of tylose contents and (iii) direct gel secretion from adjacent parenchymal cells through the pits, as previously reported in other plants (STREET et al 1986;LE PiCARD and EL MAHJOUB 1987).…”
Section: Discussionmentioning
confidence: 88%
“…Vessel pit thickening and closing at an advanced stage of the disease was also observed. This, as shown in various vascular diseases, is related to increased metabolic activity of vessel associated cells leading to synthesis of wall polymers, such as lignins, and wall insolubilization of phenolic compounds (CATESSON et al 1972;CZANINSKI et al 1975;ROBB et al 1979b;LE PICARD and EL MAHJOUB 1987;CHERIF et al 1991). This wall thickenings form physical and chemical barriers and contribute to horizontal restriction of fungal colonization.…”
Vascular modification of plane tree seedlings inoculated with Ceratocystis fimbriata f. sp. platani, the canker stain disease agent, were characterized using histochemical and scanning electron microscopy methods.
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