Tylose Formation and Changes in Phenolic Compounds of Grape Roots Infected with «Phaeomoniella chlamydospora» and «Phaeoacremonium» Species

Content Provider	Directory of Open Access Journals (DOAJ)
Author	Ana Gonzalez Ana Ortuño José Del Rio Juana M. Botia María D. Fuster Pedro Gomez Victor Frias
Abstract	The role of phenolic compounds in strengthening resistance of grapevine to young grapevine decline was analysed. The formation of tyloses has also been associated with this disease. A microscopic study showed that tyloses originated in parenchyma cells associated with the xylem and from there invaded the xylem lumen. As tyloses formed, there were changes in the cell wall, associated with the accumulation of crystalline structures. The cells surrounding the blocked xylem contained more polyphenolic compounds than the cells of intact xylem. Changes in the level and composition of polyphenolic compounds occurred in relation to the severity of infection. Tannin concentrations also increased with increasing numbers of xylem vessels containing tyloses. Root extracts added to fungal culture media inhibited mycelial growth of Phaeomoniella chlamydospora, Phaeoacremonium aleophilum and Pm. inflatipes. Inhibition was greater with extracts from roots with tyloses, and was also correlated with polyphenol content. Extracts of the leaves, stems and berries of vines treated with Brotomax, which increases the biosynthesis of phenolic compounds, inhibited mycelial growth of the fungi compared to untreated control plants.
Related Links	https://oajournals.fupress.net/index.php/pm/article/view/4933
ISSN	00319465
e-ISSN	15932095
DOI	10.14601/Phytopathol_Mediterr-1644
Journal	Phytopathologia Mediterranea
Issue Number	3
Volume Number	40
Language	English
Publisher	Firenze University Press
Publisher Date	2001-01-01
Publisher Place	Italy
Access Restriction	Open
Subject Keyword	Botany
Content Type	Text
Resource Type	Article
Subject	Plant Science Horticulture Agronomy and Crop Science