Comparison of Morphological Indexes and the Pathogenicity of Bursaphelenchus xylophilus in Northern and Southern China
Open Access
- 7 March 2021
- Vol. 12 (3), 310
- https://doi.org/10.3390/f12030310
Abstract
The pine wood nematode (PWN) Bursaphelenchus xylophilus is recognized as a major invasive species in many countries and causes widespread mortality in pine trees. Pine wood nematode disease (PWD) has spread northward from southern China to several areas of Liaoning Province, which has temperatures outside of the optimal range for this disease. To determine whether obvious variations in the population adaptability of PWN are involved in its rapid spread from southern to northern China, this study compared the differences in morphology of eight southern strains and eight northern strains and the pathogenicity of the 16 strains to Pinus thunbergii, the pine species that is the most susceptible to PWD in China, and to P. tabuliformis, the main PWN host in northern Liaoning Province. The southern-strain females were smaller than the northern-strain females, except for strain GD32. The size differences between the males of the different strains were not significant. The difference in pathogenicity between the northern and southern strains to P. tabuliformis was more significant than the difference in their pathogenicity to P. thunbergii. The pathogenicity differentiation among northern strains was lower than that among southern strains, and the northern strains showed stronger pathogenicity to P. tabuliformis. The P. tabuliformis inoculation experiment showed that the pathogenicity of GD32, JS27, FJ14, LN13, and LN06 was significantly higher than that of FJ13. The results suggest that some PWN populations in the southern region, which are better adapted to P. tabuliformis, were likely directly transmitted to the northern region, resulting in the spread of PWD in the northern region. The spread of PWN from the south did not necessarily require a process of adaptation to the host or to the northern climate.Keywords
Funding Information
- National Key Research and Development Program of China (2018YFD0600203)
- National Natural Science Foundation of China (31800543 (X.D.))
This publication has 8 references indexed in Scilit:
- Transcriptome Analysis of Bursaphelenchus xylophilus Uncovers the Impact of Stenotrophomonas maltophilia on Nematode and Pine Wilt DiseaseForests, 2020
- Identification and genetic analysis of the pinewood nematode Bursaphelenchus xylophilus from Pinus yunnanensisForest Pathology, 2015
- Making headway in understanding pine wilt disease: What do we perceive in the postgenomic era?Journal of Bioscience and Bioengineering, 2013
- Migrations and Multiplications of Bursaphelenchus xylophilus and B. mucronatus in Pinus thumbergii in Relation to Their PathogenicityThe Plant Pathology Journal, 2013
- Estimation of virulence of Bursaphelenchus xylophilus (Nematoda: Aphelenchoididae) based on its reproductive abilityNematology, 2007
- A PCR primer set for determination of phylogenetic relationships of Bursaphelenchus species within the xylophilus groupNematology, 2002
- First report of Bursaphelenchus xylophilus in Portugal and in EuropeNematology, 1999
- Description of Bursaphelenchus Lignicolus N. Sp. (Nematoda: Aphelenchoididae) From Pine Wood and Histopathology of Nematode-Infested TreesNematologica, 1972