Journal
PLANT PATHOLOGY JOURNAL
Volume 32, Issue 4, Pages 340-346Publisher
KOREAN SOC PLANT PATHOLOGY
DOI: 10.5423/PPJ.OA.01.2016.0025
Keywords
cell death; epithelial cell; evans blue; fluorescein isothiocyanate-conjugated wheat germ agglutinin; pine wilt disease
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Funding
- National Institute of Forest Science
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To understand how Bursaphelenchus xylophilus kills pine frees, the differences between the effects of B. xylophilus and B. mucronatus on pine trees are usually compared. In this study, the migration and attacking ability of a non-pathogenic B. mucronatus in Pinus thunbergii were investigated. The distribution of B. mucronatus and the number of dead epithelial cells resulting from inoculation were compared with those of the pathogenic B. xylophilus. Although B. mucronatus is non-pathogenic in pines, its distribution pattern in P. thunbergii was the same as that of B. xylophilus. We therefore concluded that the non-pathogenicity of B. mucronatus could not be attributed to its migration ability. The sparse and sporadic attacking pattern of B. mucronatus was also the same as that of B. xylophilus. However, the number and area of the dead epithelial cells in pine cuttings inoculated with B. mucronatus were smaller than in those cuttings inoculated with B. xylophilus, meaning that the attacking ability of B. mucronatus is weaker than that of B. xylophilus. Therefore, we concluded that the weaker attacking ability of B. mucronatus might be the factor responsible for the non-pathogenicity.
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