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Adventitious roots support population expansion of the invasive plant Mikania micrantha Kunth

文献类型： 外文期刊

作者： Shen, Shicai 1 ; Xu, Gaofeng 1 ; Li, Diyu 1 ; Yang, Shaosong 1 ; Jin, Guimei 1 ; Liu, Shufang 1 ; Clements, David Roy; 1 ;

作者机构： 1.Yunnan Acad Agr Sci, Agr Environm & Resource Res Inst, Key Lab Green Prevent & Control Agr Transboundary, Kunming 650205, Yunnan, Peoples R China

2.Trinity Western Univ, Dept Biol, Langley, BC, Canada

3.Yunnan Acad Agr Sci, Biotechnol & Germplasm Resources Inst, Agr Biotechnol Key Lab Yunnan Prov, Kunming, Yunnan, Peoples R China

期刊名称：PHYSIOLOGIA PLANTARUM （ 影响因子：4.5； 五年影响因子：4.576 ）

ISSN： 0031-9317

年卷期： 2021 年 173 卷 3 期

页码：

收录情况： SCI

摘要： Mikania micrantha Kunth is a serious invasive alien plant characterized by the formation of an adventitious root system in its prostrate growth form. Unlike the initial roots from seed germination, adventitious roots gradually appear above the stem and branch nodes. Little is known about adventitious roots play on plant growth and population expansion of M. micrantha. We hypothesized that adventitious roots provide an advantage for plant growth and nutrient availability. To test this hypothesis, plant growth, physiology, and nutrition characteristics of M. micrantha were measured under four soil surface conditions allowing various plant parts to touch the soil to stimulate variable adventitious root formation. The results showed that the biomass, stem length, branch number, and adventitious root biomass of M. micrantha were significantly increased (P < 0.05) with increasing nodes bearing adventitious roots. As the number of nodes with adventitious roots increased, the net photosynthetic rate, antioxidant enzyme activities like superoxide dismutase, catalase, peroxidase, and malondialdehyde, chlorophyll content, and plant nutrient contents (N, P, and K) of M. micrantha were increased (P < 0.05), with higher values in main stem leaves than in those of branch leaves. The concentrations of soil organic matter, total N, total P, total K, available N, available P, and available K were greater (P < 0.05) in initial soil (CK) than in treatment soil (with M. micrantha) and were significantly reduced by adventitious roots. Our study was the first to show that plant growth, physiology and nutrition status of M. micrantha were strongly promoted by adventitious roots in the prostrate growth form.

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