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Rhizoctonia solani AG 2‐1 als Erreger einer Kotyledonenfäule bei Rotbuche (Fagus sylvatica)
Author(s) -
Hietala A. M.,
Mehli L.,
Nagy N. E.,
Kvaalen H.,
La Porta N.
Publication year - 2005
Publication title -
forest pathology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.535
H-Index - 49
eISSN - 1439-0329
pISSN - 1437-4781
DOI - 10.1111/j.1439-0329.2005.00420.x
Subject(s) - fagus sylvatica , biology , rhizoctonia solani , beech , cotyledon , internal transcribed spacer , botany , ribosomal dna , pathogen , damping off , population , microbiology and biotechnology , ribosomal rna , genetics , biological pest control , phylogenetics , gene , demography , sociology
Summary Rhizoctonia solani was frequently isolated in the Italian Alps from nursery‐grown European beech ( Fagus sylvatica ) seedlings displaying symptoms of cotyledon rot. Koch's postulates were verified and mode of infection of the associated isolates was investigated with light and scanning electron microscopy. Population structure of the pathogen was investigated by scoring the anastomosis reaction type in pairings between different isolates from the same seedbed. One pathogen genotype showed a large distribution area within the seedbed, this implying that the inoculum had been building up in the seedbed over a longer time period. Hyphal anastomosis tests and sequence analysis of the internal transcribed spacer (ITS) region of ribosomal DNA indicated that the pathogen belongs to AG 2‐1 of R. solani . ITS sequence analysis indicates that the isolates from beech are closely related to R. solani isolates causing a disease on tulip. The striking similarities between the two diseases are discussed.