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

Xu, Pengliang; Christie, Peter; Liu, Yu; Zhang, Junling; Li, Xin

doi:10.1016/j.envpol.2008.01.003

Cited by 63 publications

(29 citation statements)

References 28 publications

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“…The importance of improved P nutrition in the protective effects of mycorrhizal association on host plants against As contaminations has also been observed in our study, which is in accordance with many previous studies Xia et al, 2007;Xu et al, 2008). As been well documented, the improvement of plant P nutrition would directly lead to better plant growth and so-called ''dilution effects'' on As in plant tissues.…”

Section: Discussionsupporting

confidence: 80%

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Arbuscular mycorrhizal symbiosis influences arsenic accumulation and speciation in Medicago truncatula L. in arsenic-contaminated soil

Zhang

Ren

et al. 2015

Chemosphere

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h i g h l i g h t sDMA was detected only in shoots of mycorrhizal plants. Mycorrhizal inoculation increased the percentage of As(III) in total As in plants. AM fungi are potentially involved in As transformation in the plant-soil continuum.a r t i c l e i n f o t r a c tIn two pot experiments, wild type and a non-mycorrhizal mutant (TR25:3-1) of Medicago truncatula were grown in arsenic (As)-contaminated soil to investigate the influences of arbuscular mycorrhizal fungi (AMF) on As accumulation and speciation in host plants. The results indicated that the plant biomass of M. truncatula was dramatically increased by AM symbiosis. Mycorrhizal colonization significantly increased phosphorus concentrations and decreased As concentrations in plants. Moreover, mycorrhizal colonization generally increased the percentage of arsenite in total As both in shoots and roots, while dimethylarsenic acid (DMA) was only detected in shoots of mycorrhizal plants. The results suggested that AMF are most likely to get involved in the methylating of inorganic As into less toxic organic DMA and also in the reduction of arsenate to arsenite. The study allowed a deeper insight into the As detoxification mechanisms in AM associations. By using the mutant M. truncatula, we demonstrated the importance of AMF in plant As tolerance under natural conditions.

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Section: Discussionsupporting

confidence: 80%

“…Under As contaminations, AMF could effectively improve plant P nutrition and growth, resulting in a ''dilution effect'' on As in plant tissues Xia et al, 2007;Xu et al, 2008). More importantly, AMF may also directly mediate As uptake by plants.…”

Section: Introductionmentioning

confidence: 99%

Arbuscular mycorrhizal symbiosis influences arsenic accumulation and speciation in Medicago truncatula L. in arsenic-contaminated soil

Zhang

Ren

et al. 2015

Chemosphere

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“…Another possible explanation may be related to a pH decrease in the rhizosphere, because AM fungi exude organic acids to cope with metal(loid) toxicity (Garg and Bhandari, 2014) and also modify the amount and composition of root exudates, thus leading to a decreased availability of As (Hua et al, 2009). Not least, these fungi may regulate P i uptake, so as to downregulate As V transport into the host (Xu et al, 2008). In fact, P i and As V are chemical analogs and are translocated competitively across the plasma membrane via the same system, that is high-affinity phosphate transporters Macnair, 1990, 1992), some of which have been identified in tobacco (Kai et al, 2002).…”

Section: Discussionmentioning

confidence: 99%

The symbiosis between Nicotiana tabacum and the endomycorrhizal fungus Funneliformis mosseae increases the plant glutathione level and decreases leaf cadmium and root arsenic contents

Degola

Fattorini

Bona

et al. 2015

Plant Physiology and Biochemistry

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a b s t r a c tOver time, anthropogenic activities have led to severe cadmium (Cd) and arsenic (As) pollution in several environments. Plants inhabiting metal(loid)-contaminated areas should be able to sequester and detoxify these toxic elements as soon as they enter roots and leaves. We postulated here that an important role in protecting plants from excessive metal(loid) accumulation and toxicity might be played by arbuscular mycorrhizal (AM) fungi. In fact, human exploitation of plant material derived from Cd-and As-polluted environments may lead to a noxious intake of these toxic elements; in particular, a possible source of Cd and As for humans is given by cigarette and cigar smoke. We investigated the role of AM fungus Funneliformis mosseae (T.H. Nicolson & Gerd.) C. Walker & A. Schüßler in protecting Nicotiana tabacum L. (cv. Petit Havana) from the above-mentioned metal(loid) stress. Our findings proved that the AM symbiosis is effective in increasing the plant tissue content of the antioxidant glutathione (GSH), in influencing the amount of metal(loid)-induced chelators as phytochelatins, and in reducing the Cd and As content in leaves and roots of adult tobacco plants. These results might also prove useful in improving the quality of commercial tobacco, thus reducing the risks to human health due to inhalation of toxic elements contained in smoking products.

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“…They can improve the host plants growth (Wu et al 2011), improve plant nutrient and water uptake, enhance plant tolerance to environmental stresses, including metal tolerance, and are abundant in the plant rhizosphere interface (Smith & Read 2008, Xu et al 2008, Barea et al 2011. AMF are important micro-organisms which contribute to plant diversity and ecosystem functions (Van der Heijden et al 1998).…”

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Arbuscular mycorrhizal fungal symbiosis with Sorbus torminalis does not vary with soil nutrients and enzyme activities across different sites

Moradi¹,

Shirvany²,

Matinizadeh³

et al. 2015

iForest

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© iForest -Biogeosciences and Forestry IntroductionArbuscular mycorrhizal fungi (AMF) play a critical role in the early establishment of land plants (Redecker et al. 2000). They can improve the host plants growth (Wu et al. 2011), improve plant nutrient and water uptake, enhance plant tolerance to environmental stresses, including metal tolerance, and are abundant in the plant rhizosphere interface (Smith & Read 2008, Xu et al. 2008, Barea et al. 2011. AMF are important micro-organisms which contribute to plant diversity and ecosystem functions (Van der Heijden et al. 1998). About 80% of higher plants have associations with arbuscular mycorrhizae (Smith & Read 2008). These associations lead to better phosphorous (P) absorption (Rooney et al. 2011) and the fungi can supply up to 80% of P and 25% of nitrogen (N) to the host plants (Marschner & Dell 1994). In turn, the fungi are highly dependent on their host plants for carbon nutrition (Smith & Read 1997). P is an important element which is actively supplied to host plants by AMF. The amount of P influx into colonized roots can be three to five times higher than non-mycorrhizal roots (Smith et al. 2003).Some soil characteristics have significant influences on the development of mycorrhizal fungi in roots, such as potassium (K), nitrogen (Treseder 2004), pH (Isobe et al. 2007, and compaction (Waltert et al. 2002), as well as climatic conditions and host plant effects (Kivlin et al. 2011). Increasing soil acidity or alkalinity was also a detrimental factor to AMF sporulation in field soils (Isobe et al. 2007). AMF also affect soil enzymes (Huang et al. 2009, Wu et al. 2011 by increasing activities such as dehydrogenase, phosphatase and urease (Huang et al. 2009).Wild service tree (Sorbus torminalis L. Crantz) is widely distributed across Europe, north-western African forests, and southwestern Asia (Nicolescu et al. 2009). It is also a rare, protected tree species found in the northern forests of Iran at elevations between 170 to 2700 m a.s.l., where it can reach up to 34 m in height (Pourmajidian 2000). Different species of the genus Sorbus are found in association with both arbuscular mycorrhizal and ecto-mycorrhizal fungi (Raspe et al. 2000).In this study, we hypothesized that AMF colonization of specific plants can vary significantly between sites with different soil characteristics. A comprehensive study was conducted to determine how AMF colonization of a wild service tree (Sorbus torminalis) was influenced by soil nutrients and enzyme activities at three different sites. A better understanding of AMF relationships with the wild service tree and its role in nutrient absorption and soil enzymes will enable better management of the tree stands in terms of nutrient uptake and more vigorous tree growth. Materials and methods Study sites and samplingThe study was conducted in a natural mixed forest of northern Iran consisting of Fagus orientalis Lipsky, Carpinus betulus L., and Acer cappadoeicum Gled along with a minor population of Sorbus torminalis. According to...

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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

Cited by 63 publications

References 28 publications

Arbuscular mycorrhizal symbiosis influences arsenic accumulation and speciation in Medicago truncatula L. in arsenic-contaminated soil

Arbuscular mycorrhizal symbiosis influences arsenic accumulation and speciation in Medicago truncatula L. in arsenic-contaminated soil

The symbiosis between Nicotiana tabacum and the endomycorrhizal fungus Funneliformis mosseae increases the plant glutathione level and decreases leaf cadmium and root arsenic contents

Arbuscular mycorrhizal fungal symbiosis with Sorbus torminalis does not vary with soil nutrients and enzyme activities across different sites

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