University of Taipei:Item 987654321/2592
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    题名: Allelopathy on bark of downed logs of Chamaecyparis obtusa Sieb. and Zucc. var. formosana (Hayata) Rehder
    作者: TSENG Mei-Hwei
    LAI Wen-Rong
    HSIEH Chin-Lin
    KUO Yueh-Hsiung
    曾梅慧
    郭悅雄
    賴文榮
    謝金霖
    贡献者: 臺北市立教育大學自然科學系
    关键词: Spermatophyta
    Gymnospermae
    Coniferales
    Softwood forest tree
    Asia
    Taiwan
    Seedlings
    Survival
    Germination
    Laboratory study
    Phytotoxicity
    Inhibitor
    Allelochemicals
    Salicylic acid
    Bark
    Allelopathy
    日期: 2007
    上传时间: 2009-07-27 16:44:45 (UTC+8)
    摘要: Chamaecyparis obtusa Sieb. and Zucc. var. formosana (Hayata) Rehder is the dominant species in the temperate forest of Yuanyang Lake Nature Reserve (YYL), Taiwan. Although downed logs of C. obstusa var. formosana occupy only a small percentage of the forest floor area in YYL, they are important regeneration substrates. Seedlings of this species often grow without competition on the new downed logs, and a few broadleaf trees grow with them. We hypothesized that the bark of the newly fallen logs possesses allelopathic potential that provides a habitat especially suitable for seedling establishment. Eight different seeds including those from Lactuca sativa L. (lettuce), Bidens pilosa (an invasive weed), and six species in YYL were planted on the bark of the downed logs in an incubator for germination tests. Two dominant species in the forest of YYL, C. obtusa var. formosana and Rhododendron formosanum, were able to grow normally, but the others, Pieris taiwanensis, Barthea formosana, Chamaecyparis formosensis, Miscanthus transmorrisonensis, lettuce, and B. pilosa were growth inhibited. A bioactivity-guided isolation was designed to isolate allelochemicals from the bark. Salicylic acid, one of the inhibiting substances, was isolated and identified by gas chromatography/mass spectroscopy (GC/ MS), proton nuclear magnetic resonance (1H NMR), and infrared (IR). Bioassay of salicylic acid confirmed a phytotoxic effect. The results suggest that the dominance of C. obtusa var. formosana seedlings on bark could be partly due to allelopathy.
    關聯: Journal of chemical ecology, v33(6), p.1283-1296
    显示于类别:[應用物理暨化學學系暨碩士班] 期刊論文

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