Abstract
The regeneration of Japanese black pine (Pinus thunbergii) seedlings is inhibited in a black locust (Robinia pseudoacacia)-dominated area. We examined the presence of pathogenic fungi in Japanese black pine seedlings in the area in order to determine the effect of pathogenic fungi on the inhibition of regeneration. When Japanese black pine seedlings were planted in the soil obtained from a black locust-dominated area, all of the seedlings died under low-intensity light conditions, whereas 84% of the seedlings survived in the soil obtained from a Japanese black pine-dominated area under the same light conditions. One fungus was isolated from 48.7% of the dead pine seedlings and was identified as Cylindrocladium pacificum Kang, Crous & Schoch, based on the morphological characteristics, growth, and DNA analysis. This fungus was also isolated from 50% of the dead pine seedlings in 2005 and 66.7% of the seedlings in 2006—both were planted in a black locust-dominated area. The virulence of this fungus increased under high-nitrogen and/or low-intensity light conditions. These results reveal the possibility that the soil eutrophication and shading by the black locust are conducive to a severe damping-off disease and threaten the survival and regeneration of Japanese black pine seedlings.
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Acknowledgments
This study was jointly conducted by the Graduate School of Agriculture, Kyoto University, and the Arid Land Research Center (ALRC), Tottori University. We would like to thank Dr. Dai Hirose, Sugadaira Montane Research Center, University of Tsukuba, and Dr. Sumiko Kaihara for their valuable suggestions.
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Taniguchi, T., Tanaka, C., Tamai, S. et al. Identification of Cylindrocladium sp. causing damping-off disease of Japanese black pine (Pinus thunbergii) and factors affecting the disease severity in a black locust (Robinia pseudoacacia)-dominated area. J For Res 13, 233–240 (2008). https://doi.org/10.1007/s10310-008-0076-6
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DOI: https://doi.org/10.1007/s10310-008-0076-6