Allelopathic effects from aqueous extracts of exotic Thalia dealbata on six aquatic plant species
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摘要: 采用生物测定方法研究了再力花Thalia dealbata地下部水浸提液对荇菜Nymphoides peltatum，苦草Vallisneria natans，水田芥Nasturtium officinale，黄菖蒲Iris pseudacorus，芦苇Phragmites australis和水蓼Polygonum hydropiper等6种植物种子萌发以及幼苗生长的影响。结果表明：再力花地下部水浸提液对6种种子的萌发率、萌发指数、株高、根长、鲜质量、干质量均有不同程度的抑制作用，抑制作用随着浸提液质量浓度的提高而增强。高质量浓度提取液对幼苗生长有显著抑制作用（P＜0.01），50 gL－1的再力花地下部水浸提液对6种水生植物株高抑制率分别为29.2%，64.9%，42.3%，87.1%，18.16%和75.6%，根长抑制率分别为50.5%，90.1%，72.7%，76.2%，29.9%和74.2%。再力花地下部水浸提液对各项指标的影响强弱依次为萌发指数＞发芽率＞根长＞干质量＞鲜质量＞苗高。受试植物种子总化感效应大小依次为水蓼＞水田芥＞苦草＞黄菖蒲＞荇菜＞芦苇。图3表1参26Abstract: To test the allelopathic effects of Thalia dealbata on seed germination and seedling growth，aqueous extracts of the T. dealbata rhizome and root were applied to six aquatic plants；namely，Nymphoides peltatum，Vallisneria natans，Nasturtium officinale，Iris pseudacorus，Phragmites australis，and Polygonum hydropiper using the bioassay method. Results showed that the aquatic rhizome and root extracts at a concentration of 50 gL-1 had highly significant （P ＜ 0.01） allelopathic effects on seed germination for all six aquatic plant species. Seedling shoot length for the six listed species above were reduced 29.2%，64.9%，42.3%，87.1%，18.2%，and 75.6%，respectively；and seedling root length was reduced 50.5%，90.1%，72.7%，76.2%，29.9%，and 74.2%，in that order. Also the seed germination index was more sensitive to extract application than germination percentage and other indexes with allelopathic sensitivity in the order of Polygonum hydropiper ＞ Nasturtium officinale ＞ V. natans ＞ I. pseudacorus ＞ Nymphoides peltata ＞ Phragmites australis.［Ch，３ fig. 1 tab. 26 ref.］
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Key words:
- botany /
- Thalia dealbata /
- allelopathy /
- aquatic plant /
- aqueous extract /
- seed germination
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链接本文:
https://zlxb.zafu.edu.cn/article/doi/10.11833/j.issn.2095-0756.2012.05.014
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