Abstract
Key message
Ectomycorrhizal composition and associated fungi affect the intra-specific ability of resistant black pines for physiological adaptation.
Abstract
Since Japanese black pine (Pinus thunbergii Parl.) forests have been widely devastated by pine wilt disease, several kinds of resistant black pines have been developed. Although all of the resistant black pines are the same species, these resistant trees show different physiological characteristics. We investigated the survival rates and growth rates, as well as ectomycorrhizal composition and associated fungi, on four kinds of Japanese black pine seedlings (three pine wilt-resistant and one non-resistant), and elucidated the factors affecting the various physiological characteristics. We found that the abundance of ectomycorrhizal types differed even though seedlings were grown sympatrically in the same areas for about 2 years. The seedlings that had plentiful white ectomycorrhizae showed the highest survival and growth rates regardless of the variety of black pine. Sequence similarities of the white ectomycorrhizae in the rDNA ITS region were best matched with members of Astraeus sp., Atheliaceae, Boletaceae and Thelephoraceae. Our findings indicate that intra-specific physiological adaptation might be affected by ectomycorrhizal composition or by the specific ectomycorrhizal species.
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Author contribution statement
HN conceived of the study, carried out the field survey, participated in the DNA analysis, performed the statistical analysis and drafted the manuscript. NE carried out the field survey and helped to draft the manuscript. TU played a central role in the DNA analysis. NY carried out the field survey and participated in the coordination of this study. YM played an extraordinary role in conception and design of this study, and helped to draft the manuscript. All authors read and approved the final manuscript.
Acknowledgments
We thank the editor and two anonymous reviewers for their valuable comments on the draft manuscript. We also thank Dr. Akira Ishida, Mr. Yusuke Ogasawara, Mr. Yusuke Uehara, Ms. Nobumi Toyoda, and all the members of Aichi Prefectural Forestry Research Institute, Aichi Prefectural Mariculture Center, and the Forest Pathology and Mycology Laboratory, Graduate School of Bioresources, Mie University, for their help during our study, and Ms. Tomiko Chikada, the Mie University Life Science Research Center for DNA sequencing. This study was supported in part by the Grants-in-Aid for Scientific Research from the Japan Ministry of Education, Science, Sports and Culture to YM (25304026).
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The authors declare that they have no conflict of interest.
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Communicated by T. Koike and K. Noguchi.
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Nakashima, H., Eguchi, N., Uesugi, T. et al. Effect of ectomycorrhizal composition on survival and growth of Pinus thunbergii seedlings varying in resistance to the pine wilt nematode. Trees 30, 475–481 (2016). https://doi.org/10.1007/s00468-015-1217-0
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DOI: https://doi.org/10.1007/s00468-015-1217-0