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題 名 | 內生菌Hymenoscyphus sp.接種西施花之研究=Study of Inoculation on Rhododendron Ellipticum with Endophytic Fungus Hymenoscyphus sp. |
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作 者 | 謝宛倫; 李明仁; | 書刊名 | 中華林學季刊 |
卷 期 | 43:4 2010.12[民99.12] |
頁 次 | 頁511-524 |
分類號 | 435.412、435.412 |
關鍵詞 | 西施花; 杜鵑類菌根; 石南原; 形態; 微細構造; Rhododendron ellipticum Maxim.;; Hymenoscyphus sp.; Ericoid mycorrhiza; Heathland; Morphology; Ultrastructure; |
語 文 | 中文(Chinese) |
中文摘要 | 西施花(Rhododendron ellipticum Maxim.)為台灣原生杜鵑科(Ericaceae)杜鵑屬(Rhododendron)之樹種。本研究旨在調查西施花生育地土壤之化學性質,觀察杜鵑類菌根的形態與微細構造,分離鑑定其內生菌,並接種至西施花之無菌苗再合成菌根。研究結果顯示:西施花之生育地具石南原特性,其土壤屬酸性(pH 4.1),可交換性陽離子濃度低(Ca(上標2+):1.44±0.1cmol(下標 (+))kg^(-1)、K(上標 +):0.08cmol(下標 (+))kg^(-1)、Mg(上標 2+):0.03cmol(下標 (+))kg^(-1),全氮量為1.23±0.02%,有效磷為5.46±0.07(μg/g)),且酚類化合物含量高(52.65±0.89(μg/g)),枯枝落葉層難分解,土壤養分之有效性低。西施花菌根之微細構造顯示,根部皮層細胞內有許多菌絲圈為典型杜鵑類菌根構造;分離之內生菌其菌絲生長速率緩慢(1.0±0.05mm/day (MEA), 0.91±0.04mm/day (PDA)),具杜鵑類菌根之特徵;此一內生菌菌株以5.8S rDNA序列鑑定屬於Hymenoscyphus sp.。將Hymenoscyphus sp.菌株接種至西施花無菌苗根部2個月後,發現接種苗之根部皮層細胞內形成許多菌絲圈。本研究證實西施花可與內生菌Hymenoscyphus sp.形成杜鵑類菌根。 |
英文摘要 | Taiwan azalea (Rhododendron ellipticum Maxim.) is an indigenous Rhododendron tree species of Ericaceae in Taiwan. In this study, the site property, morphology and ultrastructure of ericoid mycorrhiza of Taiwan azalea were investigated. The associated ericoid endophyte was isolated, identified, and inoculated onto roots of aseptic seedlings of Taiwan azalea for re-synthesis of mycorrhiza. The soil property of Taiwan azalea had heathland charaeteristics with pH 4.1, low soil fertility (Ca(superscript 2+): 1.44±0.1 cmol(subscript (+)) kg^(-1), K(superscript +): 0.08 cmol(subscript (+)) kg^(-1), Mg(superscript 2+): 0.03 cmol(subscript (+)) kg^(-1), total N: 1.23±0.02%, P: 5.46±0.07 (μg/g)), and high total phenolic content (52.65±0.89 μg/g), which could inhibit litter decomposition and result in low availability of nutrients. Ultrastructure study of the mycorrhiza revealed that in cortical cells, there were hyphal coils, which are typical characteristic of ericoid mycorrhiza. The isolated ericoid endophyte had low hyphal growth rates of 1.0±0.05 mm/day (MEA), 0.91±0.04 mm/day (PDA), and was identified as Hymenoscyphus sp. with 5.8S rDNA sequence. Taiwan azalea seedlings inoculated with Hymenoscyphus sp. developed hyphal coils in cortical cells. This study demonstrated that the Taiwan azalea seedlings could form ericoid mycorrhiza with endophytic fungus Hymenoscyphus sp. |
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