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Variation in Oidium neolycopersici development on host and non‐host plant species and their tissue defence responses
Author(s) -
MIESLEROVÁ B,
LEBEDA A,
KENNEDY R
Publication year - 2004
Publication title -
annals of applied biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.677
H-Index - 80
eISSN - 1744-7348
pISSN - 0003-4746
DOI - 10.1111/j.1744-7348.2004.tb00339.x
Subject(s) - biology , powdery mildew , botany , cucumis , lycopersicon , blumeria graminis , conidium , pisum , plant disease resistance , biochemistry , gene
Summary Detailed studies of the infection processes of Oidium neolycopersici (tomato powdery mildew) and plant tissue responses were carried out on 10 Lycopersicon spp. accessions and one of each species of Cucumis sativus, Datura stramonium, Lactuca sativa, Petunia hybrida and Pisum sativum with different levels of resistance. Germination of O. neolycopersici conidia was not inhibited by the host plant. However, in the early stages of O. neolycopersici infection significant differences in conidial germ tube development on resistant and susceptible plant lines were observed. The first substantial differences appeared after 24 h post inoculation (hpi). Mycelia and conidiophores developed on susceptible lines; however, there was no mycelial development on resistant plant lines. The most frequent resistant response in Lycopersicon species was the necrotic (hypersensitive) reaction (HR), occasionally followed by pathogen development. The completely resistant accession L. hirsutum (LA 1347) showed only a limited number of necrotic host cells per infection site (2%). In Oidium resistant tomato lines OR 4061 and OR 960008 the existence of adult resistance was detected. This phenomenon occurred mainly in accession OR 4061. Rapid development and profuse sporulation of O. neolycopersici was observed on juvenile plants (6–8 wk old), however this was in contrast to the slow development and sporadic sporulation observed on 4 month old plants. Evidence of posthaustorial resistance was observed in the interaction of O. neolycopersici with non‐host species ( Lactuca sativa and Pisum sativum .) This was in contrast to Datura stramonium and Petunia hybrida , where development of powdery mildew was delayed at a later stage in the infection cycle. With the exception of Pisum sativum , the necrotic (hypersensitive) response was observed often.