Allelopathy on bark of downed logs of Chamaecyparis obtusa Sieb. and Zucc. var. formosana (Hayata) Rehder

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Title:	Allelopathy on bark of downed logs of Chamaecyparis obtusa Sieb. and Zucc. var. formosana (Hayata) Rehder
Authors:	TSENG Mei-Hwei LAI Wen-Rong HSIEH Chin-Lin KUO Yueh-Hsiung 曾梅慧郭悅雄賴文榮謝金霖
Contributors:	臺北市立教育大學自然科學系
Keywords:	Spermatophyta Gymnospermae Coniferales Softwood forest tree Asia Taiwan Seedlings Survival Germination Laboratory study Phytotoxicity Inhibitor Allelochemicals Salicylic acid Bark Allelopathy
Date:	2007
Issue Date:	2009-07-27 16:44:45 (UTC+8)
Abstract:	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.
Relation:	Journal of chemical ecology, v33(6), p.1283-1296
Appears in Collections:	[Department of Applied Physics and Chemistry] Periodical Articles

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