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The influence of altitude on endophytic mycobiota in Quercus acuta leaves collected in two areas 1000 km apart

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Endophytic fungi were isolated from healthy leaves of the evergreen oak Quercus acuta on Mt Takao in eastern Honshu and on Mt Osuzu in Kyushu, Japan, to study the effect of altitude on endophyte assemblages. Phomopsis sp. 1, Discula sp. and an unidentified species (QA-b) were isolated most frequently. Comparisons of the nucleotide sequence of the rDNA ITS regions of QA-b revealed a close match with species of Tubakia. On Mt Takao, Phomopsis sp. 1 and QA-b were isolated frequently, whereas on Mt Osuzu, Discula sp. and QA-b were dominant. The isolation frequency of QA-b decreased as altitude increased, whereas the isolation frequencies of Phomopsis sp. 1 and Discula sp. increased with altitude. In vitro, QA-b did not grow at temperatures <15°C whereas Phomopsis sp. 1 and Discula sp. still grew at 5°C. These results suggest that Phomopsis sp. 1 and Discula sp. are better adapted to lower temperatures and consequently to higher altitude than QA-b.

Document Type: Research Article


Affiliations: 1: Kyushu Research Center, Forestry and Forest Products Research Institute, Kumamoto, Japan 2: Graduate School of Frontier Sciences, University of Tokyo, Kashiwa 277-8563, Japan

Publication date: June 1, 2008


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