Allelochemical autotoxicity in the emergent wetland macrophyte Juncus effusus (Juncaceae).
Allelochemical autotoxicity in the emergent wetland macrophyte Juncus effusus (Juncaceae).
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DOI：
10.2307/2656893
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发表时间：
2000-06
影响因子：
3
通讯作者：
G. Ervin;R. Wetzel
中科院分区：
文献类型：
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作者：
G. Ervin;R. Wetzel
采用与野柳同属的两种莎草科植物Eleocharis obtusa和Scirpus cyperinus的种子和幼苗，以及野柳的种子和幼苗，对其地上组织的化感毒性进行了生物测定，以评价其潜在的自毒性。生物测定是在可控的无菌条件下进行的，水芽提取物处理模拟原位溶解有机碳浓度。两种莎草的茎部发育和幼苗生物量均未受其冻干提取物的显著抑制。虽然提取物没有显著降低钝叶参和沙棘的生长，但显著降低了钝叶参幼苗的生物量特异性叶绿素a浓度。与此相反，淋滤液对叶松幼苗生物量和叶绿素a浓度的影响显著降低，幼苗梢发育迟缓。本研究结果表明，叶松幼苗对成年植株的死组织提取物具有自毒敏感性。
Bioassays for allelochemical toxicity of aboveground Juncus effusus tissues were conducted with seeds and seedlings of Eleocharis obtusa and Scirpus cyperinus, two emergent sedge species (Cyperaceae) found sympatric with J. effusus, and with seeds and seedlings of J. effusus itself to evaluate potential autotoxicity. Bioassays were performed under controlled, axenic conditions with aqueous shoot extract treatments simulating in situ dissolved organic carbon concentrations. With respect to the two sedge species, neither shoot development nor seedling biomass accrual was significantly suppressed by lyophilized whole extracts from J. effusus. Although the extracts induced no significant reduction in growth of E. obtusa or S. cyperinus, biomass-specific chlorophyll a concentration was significantly reduced in E. obtusa seedlings. In contrast, seedlings of J. effusus exhibited significant reductions of biomass and chlorophyll a concentrations, and seedling shoot development was retarded in response to leachate exposure. Results of the present study suggest that J. effusus seedlings possess autotoxic sensitivity to extracts of dead, aboveground tissues of adult plants.