Interactions of mycorrhizal fungi with Pteris vittata (As hyperaccumulator) in As-contaminated soils

Leung, Howard; Ye, Z. H.; Wong, Ming Hung

doi:10.1016/j.envpol.2005.05.009

Cited by 133 publications

(70 citation statements)

References 40 publications

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“…1). Our results are in agreement with other studies which have also reported higher tolerance of AMF to As as indicated by enhanced growth of mycorrhizal plants compared with non-mycorrhizal plants (Gonzalez-Chavez et al, 2002;Ahmed et al, 2006;Leung et al, 2006;Trotta et al, 2006;Chen et al, 2007). Adding arsenate to the soil increased the As concentrations in shoots and roots of both mycorrhizal and nonmycorhizal plants and the trend was less pronounced in plants inoculated with G. mosseae (Fig.…”

Section: Resultssupporting

confidence: 93%

“…3), whereas mycorrhizal plants readily As additional level (mg kg -1 ) Root As concentration (mg kg -1 ) Significance maintain root P concentrations without reducing shoot P concentrations. Improving plant P nutrition is regarded as an important mechanism by which mycorrhizal plants withstand high As concentrations (Ahmed et al, 2006;Leung et al, 2006;Trotta et al, 2006;Ultra et al, 2007). Our results agree with this.…”

Section: Resultsmentioning

confidence: 99%

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The arbuscular mycorrhizal fungus Glomus mosseae can enhance arsenic tolerance in Medicago truncatula by increasing plant phosphorus status and restricting arsenate uptake

Christie

Liu

et al. 2008

Environmental Pollution

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G. mosseae was more tolerant than M. truncatula to As and may have conferred enhanced host tolerance by restricting root As uptake and enhancing P nutrition. AbstractA pot experiment examined the biomass and As uptake of Medicago truncatula colonized by the arbuscular mycorrhizal (AM) fungus Glomus mosseae in low-P soil experimentally contaminated with different levels of arsenate. The biomass of G. mosseae external mycelium was unaffected by the highest addition level of As studied (200 mg kg À1 ) but shoot and root biomass declined in both mycorrhizal and nonmycorrhizal plants, indicating that the AM fungus was more tolerant than M. truncatula to arsenate. Mycorrhizal inoculation increased shoot and root dry weights by enhancing host plant P nutrition and lowering shoot and root As concentrations compared with uninoculated plants. The AM fungus may have been highly tolerant to As and conferred enhanced tolerance to arsenate on the host plant by enhancing P nutrition and restricting root As uptake.

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Section: Resultssupporting

confidence: 93%

Section: Resultsmentioning

confidence: 99%

The arbuscular mycorrhizal fungus Glomus mosseae can enhance arsenic tolerance in Medicago truncatula by increasing plant phosphorus status and restricting arsenate uptake

Christie

Liu

et al. 2008

Environmental Pollution

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“…Ying et al (2004) investigated the colonization and diversity of arbuscular mycorrhizae fungi associated with common pteridophytes and found no defined relationship between mycorrhizas and plants under field condition. Out of all recent reported arsenic hyperaccumulator ferns, only P. vittata association with mycorrhizae has well been investigated so far (Al Agely et al, 2005;Leung et al, 2006).…”

Section: Arsenic Species In Ferns -mentioning

confidence: 99%

Arsenic phytoextraction and hyperaccumulation by fern species

Gonzaga

Santos

Qiying

2006

Sci. agric. (Piracicaba, Braz.)

126

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Arsenic (As) is an ubiquitous trace metalloid found in all environmental media. Its presence at elevated concentrations in soils derives from both anthropogenic and natural inputs. Arsenic is a toxic and carcinogenic element, which has caused severe environmental and health problem worldwide. Technologies currently available for the remediation of arsenic-contaminated sites are expensive, environmentally disruptive, and potentially hazardous to workers. Phytoextraction, a strategy of phytoremediation, uses plants to clean up contaminated soils and has been successfully applied to arsenic contaminated soils. It has the advantage of being cost-effective and environmentally friendly. A major step towards the development of phytoextraction of arsenic-impacted soils is the discovery of the arsenic hyper accumulation in ferns, first in Pteris vittata, which presented an extraordinary capacity to accumulate 2.3% arsenic in its biomass. Another fern, Pityrogramma calomelanos was found to exhibit the same hyperaccumulating characteristics. After that, screening experiments have revealed that the Pteris genus is really unique in that many species have the potential to be used in phytoextraction of arsenic. In general, these plants seem to have both constitutive and adaptive mechanisms for accumulating or tolerating high arsenic concentration. In the past few years, much work has been done to understand and improve the hyperaccumulating capability of these amazing plants. In particular, the field of molecular biology seems to hold the key for the future of the phytoremediation. Key words: environmental contamination, hyperaccumulator plants, phytoremediation FITOEXTRAÇÃO E HIPERACUMULAÇÃO DE ARSÊNIO POR ESPÉCIES DE SAMAMBAIASRESUMO: O arsênio e um metalóide traço encontrado basicamente em todos os ambientes. Elevadas concentrações de arsênio no solo podem acontecer naturalmente devido ao intemperismo de rochas ricas em arsênio, como também de atividades antropogênicas. O arsênio é um elemento tóxico e cancerígeno. Em muitas partes do mundo, a contaminação pelo arsênio tem causado problemas ambientais e de saude. As técnicas disponíveis para a remediação do arsênio são economicamente proibitivas, destroem a paisagem natural e ainda podem afetar a saúde de pessoas diretamente envolvidas no processo. A fitoextração, uma das estratégias da fitoremediação, utiliza plantas para descontaminar solos e tem sido aplicada com sucesso em solos contaminados com arsênio e outros elementos. Dentre muitas vantagens, essa técnica tem baixo custo quando comparada com as convencionais. Um ponto chave no desenvolvimento da fitoextração foi a constatação de que samambaias hiperacumulam arsênio. Primeiro, em Pteris vittata, que apresentou extraordinária capacidade para remover arsênio do solo, concentrando 2.3% do arsênio na biomassa. Em seguida, foi observado que a samambaia Pityrogramma calomelanos possui capacidade semelhante para acumular arsênio. Essa característica peculiar foi observada em outras samambaias do genero Pteris. Em...

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“…The mycorrhiza tolerated elevated concentrations of As as well as increased dry biomass of the fern. Leung et al [61] also reported that the addition of rhizofungi enhanced the uptake and accumulation of As in P. vittata. Under the condition of 100 mg As per kg soil, non-colonized plants accumulated 60.4 mg As kg −1 while plants colonized by arbuscular mycorrhizal fungi (AMF) isolated from an As mine accumulated 88.1 g As kg −1 and also enhanced plant growth.…”

Section: Rhizoremediation Of Metalsmentioning

confidence: 95%

Rhizoremediation of metals: harnessing microbial communities

Banu

Ramasamy

2008

Indian J Microbiol

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With the increasing successful stories of decontamination, different strategies for metal remediation are gaining importance and popularization in developing countries. Rhizoremediation, is one such promising option that harnesses the impressive capabilities of microorganisms associated with roots to degrade organic pollutants and transform toxic metals. Since it is a plant based in-situ phytorestoration technique it is proven to be economical, effi cient and easy to implement under fi eld conditions. Plants grown in metal contaminated sites harbor unique metal tolerant and resistant microbial communities in their rhizosphere. These rhizo-microfl ora secrete plant growth promoting substances, siderophores, phytochelators to alleviate metal toxicity, enhance the bioavailability of metals (phytoremediation) and complexation of metals (phytostabilisation). Selection of right bacteria/consortia and inoculation to seed/ roots of suitable plant species will widen the perspectives of rhizoremediation.

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Interactions of mycorrhizal fungi with Pteris vittata (As hyperaccumulator) in As-contaminated soils

Cited by 133 publications

References 40 publications

The arbuscular mycorrhizal fungus Glomus mosseae can enhance arsenic tolerance in Medicago truncatula by increasing plant phosphorus status and restricting arsenate uptake

The arbuscular mycorrhizal fungus Glomus mosseae can enhance arsenic tolerance in Medicago truncatula by increasing plant phosphorus status and restricting arsenate uptake

Arsenic phytoextraction and hyperaccumulation by fern species

Rhizoremediation of metals: harnessing microbial communities

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