Bacterial community structure associated with the rhizosphere soils and roots of Stellera chamaejasme L. along a Tibetan elevation gradient

Jin, Hui; Yang, Xiaoyan; Liu, Rentao; Yan, Zhiqiang; Li, Xudong; Li, Xiuzhuang; Su, Anxiang; Zhao, Yuhui; Qin, Bo

doi:10.1007/s13213-018-1336-0

Cited by 28 publications

(29 citation statements)

References 52 publications

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“…Root exudates of S. chamaejasme inhibit the growth of seedlings across a range of grass and broad-leaved species co-occurring on these grassland soils [2,9]. Whilst bacterial [24] and fungal [57] communities associated with the S. chamaejasme rhizosphere have been investigated in several studies, there is no direct evidence of allelopathic effects on soil microbial populations. However, given the evidence of the widespread bioactive nature of chemicals derived from S. chamaejasme, including some with nematicidal properties [58] and activity against phytopathogenic fungi [27], direct effects of root chemicals on soil microflora might have been expected.…”

Section: Discussionmentioning

confidence: 99%

“…To date, much of the research on S. chamaejasme has focused on the role of allelopathic impacts on its competitive strengths (e.g., [2]). Some studies have surveyed the bacterial [23,24] and fungal [25,26] communities associated with the rhizosphere and tissues of S. chamaejasme. However, the focus of these studies did not extend to analyses of bulk soil and consideration of whether microbial communities may facilitate or be altered by the spread of this plant in alpine grassland habitats.…”

Section: Introductionmentioning

confidence: 99%

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Variation in Soil Fungal Composition Associated with the Invasion of Stellera chamaejasme L. in Qinghai–Tibet Plateau Grassland

Detheridge

Liu

et al. 2019

Microorganisms

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Stellera chamaejasme L. is the most problematic weed in China’s grasslands. Its root exudates affect co-occurring plants and thus may also affect soil fungi. Soils (0–20 cm depth) on two adjacent sites, one invaded the other uninvaded, were compared for a range of physiochemical parameters and by DNA sequencing of fungal communities. At the invaded site, relationships between S. chamaejasme abundance, soil physiochemical factors, and fungal communities were further investigated to determine whether these relationships corroborated conclusions on the basis of site differences that could be translated into functional variation. Results showed that the invaded soils had lower N, P, organic matter, fungal alpha diversity, and relative abundance of arbuscular mycorrhizal fungi (AMF), but greater abundance of pathogenic fungi. Organic matter and P were the edaphic factors most strongly linked to site differences in total fungal communities. Within the invaded site, organic matter rather than S. chamaejasme cover was closely linked to total fungal composition. However, on this site, a number of fungal species that had various ecological functions and that differentiated the two sites were related to S. chamaejasme cover. This study indicates that lower fertility soils may be more susceptible to invasion by S. chamaejasme. Although the influence of S. chamaejasme on total fungal community composition was limited, there was evidence of effects on particular fungal species. Further research is needed to determine whether these effects influence S. chamaejasme invasiveness.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Variation in Soil Fungal Composition Associated with the Invasion of Stellera chamaejasme L. in Qinghai–Tibet Plateau Grassland

Detheridge

Liu

et al. 2019

Microorganisms

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“…Moreover, many toxic weeds can capture water and nutrients from deeper soil profiles via their long and deeply distributed roots (Sun et al, 2009). Additionally, rhizobacteria has been found to stimulate the growth of these weeds by optimizing nutrient supplies and promoting plant metabolism and systemic resistance under unsuitable growth conditions (Cui et al, 2015;Hui et al, 2018;Lehmann et al, 2011;Lugtenberg & Kamilova, 2009). Endophytic bacteria also make some toxic weeds more tolerant to abiotic stress (Hyde & Soytong, 2008;Jin et al, 2014;Sieber, 2007).…”

Section: Adaptive Strategies To the Environmentmentioning

confidence: 99%

Don’t judge toxic weeds on whether they are native but on their ecological effects

Zhang

Sun

Liu

et al. 2020

Ecology and Evolution

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The sharp rise in anthropogenic activities and climate change has caused the extensive degradation of grasslands worldwide, jeopardizing ecosystem function, and threatening human well‐being. Toxic weeds have been constantly spreading in recent decades; indeed, their occurrence is considered to provide an early sign of land degeneration. Policymakers and scientific researchers often focus on the negative effects of toxic weeds, such as how they inhibit forage growth, kill livestock, and cause economic losses. However, toxic weeds can have several potentially positive ecological impacts on grasslands, such as promoting soil and water conservation, improving nutrient cycling and biodiversity conservation, and protecting pastures from excessive damage by livestock. We reviewed the literature to detail the adaptive mechanisms underlying toxic weeds and to provide new insight into their roles in degraded grassland ecosystems. The findings highlight that the establishment of toxic weeds may provide a self‐protective strategy of degenerated pastures that do not require special interventions. Consequently, policymakers, managers, and other personnel responsible for managing grasslands need to take appropriate actions to assess the long‐term trade‐offs between the development of animal husbandry and the maintenance of ecological services provided by grasslands.

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“…The exudate is linked with plant diversity and soil microorganisms [20], as exudate of some species, such as poisonous plants or weeds (e.g. Stellera chamaejasme, Colchicum autumnale) can affect other plant species [11,21,22,23,24].…”

Section: Introductionmentioning

confidence: 99%

“…Poisonous plant species are more e cient in utilizing N in poor nutrient soil than sedges and grasses, which may have been their survival mechanism in alpine grassland [28]. However, during the spreading of poisonous plants, self-reinforcing is a key driving force in degraded grassland [4,8,36], with the interaction of root exudates and rhizosphere microorganisms a key factor in the process [4,24,37]. We hypothesized that the exudate from roots of poisonous plant species contain more compounds for speci c microorganisms to promote self-growth than non-poisonous plant species.…”

Section: Introductionmentioning

confidence: 99%

Interaction between root exudates and rhizosphere microorganisms facilitates the expansion of poisonous plant species in degraded grassland

Wang

Jia

et al. 2021

Preprint

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Background The interaction between rhizosphere microorganisms and rhizosphere exudates is considered a ‘novel weapon’ for poisonous plants’ colonization, but the relationship between them in facilitating the expansion of poisonous plants in degraded or barren land is poorly understood. We examined this relationship in different degradation levels of alpine grasslands on the Tibetan plateau (3,700 m a.s.l) by determining the composition of root exudates, soil physical and chemical properties, rhizosphere microbial diversity and carbon metabolism of the main poisonous and non-poisonous plant species. Results Soil nutrients, including total organic carbon, total nitrogen and available phosphorous, diversity of microorganisms and microbial carbon metabolism were greater in the rhizosphere of poisonous than in non-poisonous plant species (P < 0.05). The distribution of bacteria and root exudates were plant species specific. Soil microbial communities were affected by habitat and plant species in degraded grassland, and more so for bacteria than fungi. The cell growth and death pathway for the poisonous species Ligularia virgaurea was greater than for other poisonous species (P < 0.05), and the difference increased with an increase in grassland degradation and a decrease in soil nutrients (P < 0.05), which could explain how L. virgaurea became the dominant poisonous species in degraded alpine grassland. The roots of L. virgaurea exudated such compounds as alkaloids, lupinic acid, terpenes, artemisinin, and coumarin, which were correlated positively with different bacteria in different habitats. Conclusion It was concluded that poisonous plant species adapted to degraded grassland through the interaction of root exudates and rhizosphere microorganisms, which facilitated their expansion in degraded alpine grassland.

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Bacterial community structure associated with the rhizosphere soils and roots of Stellera chamaejasme L. along a Tibetan elevation gradient

Cited by 28 publications

References 52 publications

Variation in Soil Fungal Composition Associated with the Invasion of Stellera chamaejasme L. in Qinghai–Tibet Plateau Grassland

Variation in Soil Fungal Composition Associated with the Invasion of Stellera chamaejasme L. in Qinghai–Tibet Plateau Grassland

Don’t judge toxic weeds on whether they are native but on their ecological effects

Interaction between root exudates and rhizosphere microorganisms facilitates the expansion of poisonous plant species in degraded grassland

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