The invasive plant Mikania micrantha affects the soil foodweb and plant-soil nutrient contents in orchards

Sun, Feng; Ou, Qiaojing; Yu, Hongxian; Li, Na; Peng, Chang-Lian

doi:10.1016/j.soilbio.2019.107630

Cited by 35 publications

(18 citation statements)

References 54 publications

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“…More recently, an appreciation for the influence of soil microbial communities on plant competitiveness has emerged (Lankau, 2010; Siefert et al ., 2018). For instance, rhizosphere microbial communities may differentially impact the availability of soil nutrients to different plant species, and thus their competitiveness (Yang et al ., 2014; Sun et al ., 2019).…”

Section: Introductionmentioning

confidence: 99%

Soil nitrogen dynamics and competition during plant invasion: insights from Mikania micrantha invasions in China

Roux

Jiang

et al. 2020

New Phytologist

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Summary Invasive plants often change a/biotic soil conditions to increase their competitiveness. We compared the microbially mediated soil nitrogen (N) cycle of invasive Mikania micrantha and two co‐occurring native competitors, Persicaria chinensis and Paederia scandens. We assessed how differences in plant tissue N content, soil nutrients, N cycling rates, microbial biomass and activity, and diversity and abundance of N‐cycling microbes associated with these species impact their competitiveness. Mikania micrantha outcompeted both native species by transferring more N to plant tissue (37.9–55.8% more than natives). We found total soil N to be at lowest, and available N highest, in M. micrantha rhizospheres, suggesting higher N cycling rates compared with both natives. Higher microbial biomass and enzyme activities in M. micrantha rhizospheres confirmed this, being positively correlated with soil N mineralization rates and available N. Mikania micrantha rhizospheres harbored highly diverse N‐cycling microbes, including N‐fixing, ammonia‐oxidizing and denitrifying bacteria and ammonia‐oxidizing archaea (AOA). Structural equation models indicated that M. micrantha obtained available N via AOA‐mediated nitrification mainly. Field data mirrored our experimental findings. Nitrogen availability is elevated under M. micrantha invasion through enrichment of microbes that participate in N cycling, in turn increasing available N for plant growth, facilitating high interspecific competition.

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Section: Introductionmentioning

confidence: 99%

Soil nitrogen dynamics and competition during plant invasion: insights from Mikania micrantha invasions in China

Roux

Jiang

et al. 2020

New Phytologist

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“…In order to test the contribution of rhizosphere bacteria to M. micrantha invasion, we conducted a pot experiment with M. micrantha and its two neighboring native species, namely, Polygonum chinense and Paederia scandens. These two plants are chosen as the control species because based on the investigation from the field sample, not only are these frequently and stably present in the invasive community of M. micrantha, but also the reproduction strategies of these two plants are very similar to those of M. micrantha (Sun et al, 2019). The seeds of three plants were germinated and grew to about 10 cm for transplanting.…”

Section: Experimental Design and Sampling Collectionmentioning

confidence: 99%

“…Mikania micrantha (Asteraceae family), an extremely fast-growing vine, is one of the top 100 worst IAS in the world ( Lowe et al, 2000 ), causing severe substantial damages to natural ecosystems ( Day et al, 2016 ) and economic losses ( Macanawai et al, 2012 ). Several mechanisms have been proposed to explain the success of M. micrantha invasion, such as rapid growth caused by high regeneration capacity of each vine node ( Li X. et al, 2013 ) and extraordinary biological characteristics including high seed production and germination ( Hu and But, 1994 ), the strong allelopathic effects on other native plant and soil microbes ( Chen et al, 2009 ), and high nutrient (NPK) turnover rates in soil ( Sun et al, 2019 ; Liu et al, 2020 ). Recently, we have published the genome of M. micrantha , as well as its rhizosphere metagenome, and also found out that the rhizosphere microbes of M. micrantha could increase the bioavailable nitrogen content to speed up the nitrogen cycle ( Liu et al, 2020 ), which might contribute to its rapid growth as well as invasion.…”

Section: Introductionmentioning

confidence: 99%

The Rhizosphere Microbiome of Mikania micrantha Provides Insight Into Adaptation and Invasion

et al. 2020

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Mikania micrantha is a noxious invasive plant causing enormous economic losses and ecological damage. Soil microbiome plays an important role in the invasion process of M. micrantha, while little is known about its rhizosphere microbiome composition and function. In this study, we identified the distinct rhizosphere microbial communities of M. micrantha, by comparing them with those of two coexisting native plants (Polygonum chinense and Paederia scandens) and the bulk soils, using metagenomics data from field sampling and pot experiment. As a result, the enrichment of phosphorus-solubilizing bacteria Pseudomonas and Enterobacter was consistent with the increased soil available phosphorus in M. micrantha rhizosphere. Furthermore, the pathogens of Fusarium oxysporum and Ralstonia solanacearum and pathogenic genes of type III secretion system (T3SS) were observed to be less abundant in M. micrantha rhizosphere, which might be attributed to the enrichment of biocontrol bacteria Catenulispora, Pseudomonas, and Candidatus Entotheonella and polyketide synthase (PKS) genes involved in synthesizing antibiotics and polyketides to inhibit pathogens. These findings collectively suggested that the enrichment of microbes involved in nutrient acquisition and pathogen suppression in the rhizosphere of M. micrantha largely enhances its adaptation and invasion to various environments.

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“…Invasive plants often change soil (a)biotic conditions, leading to altered soil microbial community diversity, structure and function (Kourtev et al 2002;Kueffer et al 2008;Liu et al 2020;Prescott and Zukswert 2016;Sun et al 2019;Zhao et al 2019). These impacts are mediated primarily through two pathways.…”

Section: Introductionmentioning

confidence: 99%

Effects of Mikania Sesquiterpene Lactones on Soil Microbes

Yu¹,

Roux²,

Zhao³

et al. 2021

Preprint

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Background and aims Allelopathy is frequently invoked as being important for successful invasion by non-native plants. Yet, the effects of specific phytochemicals of invasive plants on soil microbes remain unexplored. Methods Here we used manipulative experiments and next generation sequencing (NGS) approaches to investigate how the sesquiterpene lactones (STLs) of invasive Mikania micrantha influence soil microbial communities and nutrients.Results We found Mikania STLs to significantly increase the regulation of soil microbial activity (i.e. increased CO2 concentrations). Using the specific STL, dihydromikanolide, we found available soil nutrients to increase in the presence of this phytochemical and that bacterial richness increased while fungal richness decreased. The presence of dihydromikanolide also increased the abundance of beneficial soil bacteria and fungi associated with nutrient cycling and supply, while simultaneously lowering pathogen abundance. Clustering analysis found bacterial functional groups, such as those involved in carbon, nitrogen, phosphorus, and sulfur metabolism, to be similar in experimentally-treated dihydromikanolide soils and Mikania-invaded soils collected from the field, but significantly higher than those in uninvaded soils. This suggests that M. micrantha can enhance certain bacterial functional groups via its phytochemicals. Soil fungi, on the other hand, appeared to be less sensitive to dihydromikanolide than bacteria. Conclusions We conclude Mikania STLs, and in particular dihydromikanolide, may be key factors in determining soil microbial structure and function and may contribute to the invasion success of the species. Our findings provided a new perspective for understanding the effects of invasive plants on soil microbial communities via their impacts through phytochemicals.

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The invasive plant Mikania micrantha affects the soil foodweb and plant-soil nutrient contents in orchards

Cited by 35 publications

References 54 publications

Soil nitrogen dynamics and competition during plant invasion: insights from Mikania micrantha invasions in China

Soil nitrogen dynamics and competition during plant invasion: insights from Mikania micrantha invasions in China

The Rhizosphere Microbiome of Mikania micrantha Provides Insight Into Adaptation and Invasion

Effects of Mikania Sesquiterpene Lactones on Soil Microbes

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