Phytoprotective influence of bacteria on growth and cadmium accumulation in the aquatic plant Lemna minor

Stout, Lisa M.; Dodova, Elena N.; Tyson, Julian F.; Nüsslein, Klaus

doi:10.1016/j.watres.2010.07.073

Cited by 40 publications

(12 citation statements)

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“…In recent years, duckweeds have emerged as a promising feedstock for biofuel production due to their high growth rate and starch content (Xu et al 2011(Xu et al , 2012. Duckweeds have also been widely used in environmental biotechnology, such as wastewater treatment (Cheng & Stomp 2009) and phytoremediation (Megateli et al 2009;Khellaf & Zerdaoui 2010;Stout et al 2010). Several duckweed species, e.g.…”

Section: Introductionmentioning

confidence: 99%

Survey of duckweed diversity in Lake Chao and total fatty acid, triacylglycerol, profiles of representative strains

Tang

et al. 2015

Plant Biol J

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Lemnaceae (duckweeds) are widely distributed aquatic flowering plants. Their high growth rate, starch content and suitability for bioremediation make them potential feedstock for biofuels. However, few natural duckweed resources have been investigated in China, and there is no information about total fatty acid (TFA) and triacylglycerol (TAG) composition of duckweeds from China. Here, the genetic diversity of a natural duckweed population collected from Lake Chao, China, was investigated using multilocus sequence typing (MLST). The 54 strains were categorised into four species in four genera, representing 12 distinct sequence types. Strains representing Lemna aequinoctialis and Spirodela polyrhiza were predominant. Interestingly, a surprisingly high degree of genetic diversification within L. aequinoctialis was observed. The four duckweed species revealed a uniform fatty acid composition, with three fatty acids, palmitic acid, linoleic acid and linolenic acid, accounting for more than 80% of the TFA. The TFA in biomass varied among species, ranging from 1.05% (of dry weight, DW) for L. punctata and S. polyrhiza to 1.62% for Wolffia globosa. The four duckweed species contained similar TAG contents, 0.02% mg · DW(-1). The fatty acid profiles of TAG were different from those of TFA, and also varied among the four species. The survey investigated the genetic diversity of duckweeds from Lake Chao, and provides an initial insight into TFA and TAG of four duckweed species, indicating that intraspecific and interspecific variations exist in the content and composition of both TFA and TAG in comparison with other studies.

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Section: Introductionmentioning

confidence: 99%

Survey of duckweed diversity in Lake Chao and total fatty acid, triacylglycerol, profiles of representative strains

Tang

et al. 2015

Plant Biol J

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“…Lemna minor occurs at high densities in slow‐moving freshwater under a wide range of environmental conditions and in many parts of the world (Landolt, ; RDSC, ), with some populations regularly exposed to aquatic contaminants. There is interest in using L. minor or other duckweed species for bioremediation of contaminated water (Mo et al., ; Stout and Nüsslein, ; Stout et al., ; Sekomo et al., ; Gatidou et al., ), and microbes may amplify or underlie a number of duckweed bioremediation effects (Toyama et al., ; Ogata et al., ), so understanding how duckweed–microbe interactions respond to multiple chemical stressors has potential real‐world implications. Studies have suggested that we might be able to engineer plant microbiomes for particular applications (Mueller and Sachs, ), including water treatment using duckweed–microbe associations (Zhao et al., ), but to do so we need to understand interactions among plants, microbes, and contaminants.…”

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confidence: 99%

Resilience to multiple stressors in an aquatic plant and its microbiome

O'Brien

Luo

et al. 2019

American J of Botany

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Premise Outcomes of species interactions, especially mutualisms, are notoriously dependent on environmental context, and environments are changing rapidly. Studies have investigated how mutualisms respond to or ameliorate anthropogenic environmental changes, but most have focused on nutrient pollution or climate change and tested stressors one at a time. Relatively little is known about how mutualisms may be altered by or buffer the effects of multiple chemical contaminants, which differ fundamentally from nutrient or climate stressors and are especially widespread in aquatic habitats. Methods We investigated the impacts of two contaminants on interactions between the duckweed Lemna minor and its microbiome. Sodium chloride (salt) and benzotriazole (a corrosion inhibitor) often co‐occur in runoff to water bodies where duckweeds reside. We tested three L. minor genotypes with and without the culturable portion of their microbiome across field‐realistic gradients of salt (3 levels) and benzotriazole (4 levels) in a fully factorial experiment (24 treatments, tested on each genotype) and measured plant and microbial growth. Results Stressors had conditional effects. Salt decreased both plant and microbial growth and decreased plant survival more as benzotriazole concentrations increased. In contrast, benzotriazole did not affect microbial abundance and even benefited plants when salt and microbes were absent, perhaps due to biotransformation into growth‐promoting compounds. Microbes did not ameliorate duckweed stressors; microbial inoculation increased plant growth, but not at high salt concentrations. Conclusions Our results suggest that multiple stressors matter when predicting responses of mutualisms to global change and that beneficial microbes may not always buffer hosts against stress.

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“…Lemna minor occurs at high densities in slow-moving fresh water under a wide range of environmental conditions and in many parts of the world (Landolt, 1975; RDSC, 2016), with some populations regularly exposed to aquatic contaminants. There is interest in using L. minor or other duckweeds for bioremediation of contaminated water (Mo et al, 1989; Stout et al, 2010; Stout and Nüsslein, 2010; Sekomo et al, 2012; Gatidou et al, 2017), and microbes may amplify or underlie a number of duckweed bioremediation effects (Toyama et al, 2009; Ogata et al, 2013), so understanding how duckweed-microbe interactions respond to multiple chemical stressors has potential real-world implications. Studies have suggested that we might be able to engineer plant microbiomes for particular applications (Mueller and Sachs, 2015), including water treatment using duckweed-microbe associations (Zhao et al, 2015), but to do so we need to understand interactions among plants, microbes, and contaminants.…”

Section: Introductionmentioning

confidence: 99%

Resilience to multiple stressors in an aquatic plant and its microbiome

O'Brien

Luo

et al. 2019

Preprint

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1Premise Environments are changing rapidly, and outcomes of species interactions, es-2 pecially mutualisms, are notoriously dependent on the environment. A growing number 3 of studies have investigated responses of mutualisms to anthropogenic changes, yet most 4 studies have focused on nutrient pollution or climate change, and tested single stres-5 sors. Relatively little is known about impacts of simultaneous chemical contaminants, 6 which may di↵er fundamentally from nutrient or climate stressors, and are especially 7 widespread in aquatic habitats. 8 Methods We investigated the impacts of two common contaminants on interactions 9 between the common duckweed Lemna minor and its microbiome. Sodium chloride 10 (salt) and benzotriazole (a corrosion inhibitor) negatively a↵ect aquatic organisms 11 individually, yet commonly co-occur in runo↵ to duckweed-inhabited sites. We tested 12 three L. minor genotypes with and without the culturable portion of their microbiome 13 across field realistic gradients of salt (3 levels) and benzotriazole (4 levels) in a fully 14 factorial experiment (72 treatments), and measured plant and microbial growth. 15Key Results We found that stressors had conditional e↵ects. Salt decreased both 16 plant and microbial growth, but decreased plant survival more as benzotriazole con-17 centrations increased. In contrast, benzotriazole did not a↵ect microbial abundance, 18 and benefited plants when salt and microbes were absent, perhaps due to the biotrans-19 formation we observed without salt. Microbes did not ameliorate duckweed stressors, 20 as microbial inoculation increased plant growth, but not at high salt concentrations. 21Conclusions Our results suggest that multistressor e↵ects matter when predicting re-22 sponses of mutualisms to global change, but that mutualisms may not bu↵er organisms 23 from stressors. 24 dation 26 1 29the fates of interacting species, and most organisms engage in at least one mutualism with 30 another species, be it for nutrition, protection, or dispersal. There is concern that mutual-31 ists may be particularly vulnerable to environmental change because mutualism outcomes 32 are often context-dependent. In other words, the magnitude of benefits exchanged between 33 mutualistic partners typically depends on the external abiotic or biotic environment (Cham-34 berlain et al., 2014), and environments are changing at a historically unprecedented pace. As 35 a result, many mutualisms are now taking place in novel environments where partners face 36 multiple stressors (Kiers et al., 2015). A key question is therefore: how do anthropogenic 37 stressors, singly or in combination, a↵ect mutualism outcomes? And in the same vein, does 38 mutualism mitigate or exacerbate global change (Frederickson, 2017)? 39 There is also currently substantial interest in plant-associated microbiomes and how 40 they may facilitate acclimation or adaptation to plant stressors. The term 'microbiome' 41 refers either to the community of microbes living together in an environment, suc...

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Phytoprotective influence of bacteria on growth and cadmium accumulation in the aquatic plant Lemna minor

Cited by 40 publications

References 70 publications

Survey of duckweed diversity in Lake Chao and total fatty acid, triacylglycerol, profiles of representative strains

Survey of duckweed diversity in Lake Chao and total fatty acid, triacylglycerol, profiles of representative strains

Resilience to multiple stressors in an aquatic plant and its microbiome

Resilience to multiple stressors in an aquatic plant and its microbiome

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