Potential allelopathic effects of Mikania micrantha on the seed germination and seedling growth of Coix lacryma-jobi
Potential allelopathic effects of Mikania micrantha on the seed germination and seedling growth of Coix lacryma-jobi
复制标题
薇甘菊对薏苡仁种子萌发及幼苗生长的潜在化感作用
DOI：
10.1111/j.1445-6664.2010.00384.x
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发表时间：
2010-09-01
影响因子：
1.4
通讯作者：
Jin, Zexin
中科院分区：
文献类型：
--
作者：
Li, Junmin;Jin, Zexin
研究了薇甘菊对Coix lacryma-jobi L.种子萌发和幼苗生长的化感作用。薇甘菊水提物中含有水溶性化感物质。水提物对狗牙根种子萌发和幼苗生长的影响呈浓度依赖性。薇甘菊不同植物部位(叶、茎、根)的水提取物对金缕梅种子萌发和幼苗生长的影响不同，其中叶提取物的抑制作用最小。随着根、茎、叶提取物浓度的增加(分别为80、400、400g L-1)，马蹄莲幼苗体内的丙二醛含量分别增加了对照的%、45%和52%。薇甘菊根提取物能显著提高黄连幼苗的过氧化氢酶(CAT)活性(20g L-1和80g L-1分别为对照的48%和54%)。叶片和茎的提取物在低浓度时提高了CAT活性，但在高浓度时降低了CAT活性。根、茎、叶提取物的浓度分别为80、400、400g L-1，能显著降低黄连幼苗的过氧化物酶活性，分别为对照的27%、52%、34%。这些结果表明，薇甘菊水提物可通过调节细胞内POD、CAT等抗氧化酶活性来抑制种子萌发和幼苗生长。马蹄莲幼苗的生长抑制可能与丙二醛含量增加引起的细胞膜氧化损伤有关。
The allelopathic potential of Mikania micrantha H.B.K. to affect the seed germination and seedling growth of Coix lacryma-jobi L. was investigated. Water-soluble allelopathic substances were found in the water extracts of M. micrantha. The effect of the water extracts on the seed germination and seedling growth of C. lacryma-jobi was concentration-dependent. The water extracts from the different plant parts (leaf, stem, and root) of M. micrantha differed in their effect on the germination and seedling growth of C. lacryma-jobi, with the effect of the leaf extract being the least inhibitory. The malondialdehyde (MDA) content in the C. lacryma-jobi seedlings increased by 64%, 45%, and 52% of the control with increasing concentrations of the extracts of the root, stem, and leaf (80, 400, and 400 g L-1, respectively). The extract from the M. micrantha roots significantly increased the catalase (CAT) activity of the C. lacryma-jobi seedlings (48% and 54% of the control at the concentrations of 20 g L-1 and 80 g L-1, respectively). The extracts from the leaves and stems at low concentrations increased the CAT activity, but at high concentrations, the extracts decreased the CAT activity. The extracts from the roots, stems, and leaves at concentrations of 80, 400, and 400 g L-1 also significantly decreased the peroxidase (POD) activity of the C. lacryma-jobi seedlings to 27%, 52%, and 34% of the control, respectively. These results indicate that the water extracts of M. micrantha could inhibit the seed germination and seedling growth of C. lacryma-jobi through the regulation of anti-oxidase activity, such as POD and CAT in the cells. The growth inhibition of the C. lacryma-jobi seedlings is probably related to injury after oxidization of the cell membranes with the increase of MDA content.