occurrence of lines tolerant to the causal agent of bleeding canker, Pseudomonas syringae pv. aesculi, in a natural horse chestnut population in Central Europe

Pseudomonas syringae pv. aesculi (Pae) causes bleeding canker, a destructive disease of horse chestnut trees (Aesculus hippocastanum) that limits the breeding of horse chestnut genotypes. The susceptibility of 322 F₁progeny from 20 horse chestnut parent tree sources to the pathogen Pae was evaluated...

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Bibliographic Details
Published in:European journal of plant pathology 2015-05, Vol.142 (1), p.37-47
Main Authors: Pánková, Iveta, Krejzar, Václav, Mertelík, Josef, Kloudová, Kateřina
Format: Article
Language:English
Subjects:
Aesculus hippocastanum
Agriculture
Animal husbandry
Bacteria
Biomedical and Life Sciences
Buds
Ecology
foliar spraying
genotype
Genotypes
inoculation methods
Life Sciences
pathogenicity
Pathogens
phloem
Plant diseases
Plant Pathology
Plant populations
Plant Sciences
Plant tissues
Plant tolerance
Pseudomonas syringae
roots
stems
Survival
Trees
viability
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Summary:Pseudomonas syringae pv. aesculi (Pae) causes bleeding canker, a destructive disease of horse chestnut trees (Aesculus hippocastanum) that limits the breeding of horse chestnut genotypes. The susceptibility of 322 F₁progeny from 20 horse chestnut parent tree sources to the pathogen Pae was evaluated using different inoculation methods. The resulting infection rates, in decreasing order, were caused by inoculation of apical buds, inoculation of annual stems, insertion of bacteria into cut wounds on trunks and foliar spraying of the pathogen. According to the resistance index (RI) results of the field pathogenicity tests, at 2 or 3 years after inoculation 40, 40 and 20 % of horse chestnut parent tree sources were resistant, tolerant and susceptible, respectively, to Pae. Microbiological analyses of plant tissues from buds, phloem in the main trunks and roots of infected F₁progeny regardless of parent tree source showed long-term survival of Pae bacteria in 70 % of tolerant F₁progeny plants that lacked bleeding canker symptoms. Initial RI results and microbial analyses indicated that there was some frequency of resistance in the natural horse chestnut population. Altogether, 41 F₁progeny were the most promising lines based on their viability and the absence of Pae in their tissues.
ISSN:0929-1873
1573-8469
DOI:10.1007/s10658-014-0587-2