Structural responses in bark to mechanical wounding and Armillaria ostoyae infection in seedlings of Pinus sylvestris

Autor:	M. Johansson, K. T. Wahlström
Rok vydání:	1992
Předmět:	Stem bark Mycelial cord Ecology Armillaria biology Hypha Forestry biology.organism_classification complex mixtures Pinus visual_art Botany visual_art.visual_art_medium Bark Armillaria ostoyae Phloem
Zdroj:	Forest Pathology. 22:65-76
ISSN:	1439-0329 1437-4781
Popis:	The sequence of events leading to the restoration of an intact periderm surface in the stem bark of Pinus sylvestris following wounding and challenge with Armillaria ostoyae was determined. A sub-erized impervious tissue (SIT) was produced outside the necrophylactic periderm (NP). Al-though A. ostoyae initially infected wounded bark with intracelfularly growing hyphae, these died before penetrating deeply into the bark. Later, intercellularly growing rhizomorphs, which had also developed from the inoculum, penetrated the NP and infected the functional phloem/ cambial zone. Compared to the reactions in uninfected wounded bark, the A. ostoyae infection delayed the formation of NP and reduced the frequency of cells involved in lignification and in SIT, but increased the number of lignified cell layers. The rhizomorph infection reached deeper and lignification was more pronounced in defoliated seedlings than in non-defoliated ones. The importance of structural responses in defence against A. ostoyae is discussed.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::b946fd0a9db08dce96e8438fa3ae4056 https://doi.org/10.1111/j.1439-0329.1992.tb01434.x Zobrazit plný text záznamu Plný text