The role of arbuscular mycorrhizas in improving plant zinc nutrition under low soil zinc concentrations: a review |
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Authors: | Timothy R Cavagnaro |
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Institution: | (1) School of Biological Sciences and Australian Centre for Biodiversity, Monash University, Clayton, Victoria, 3800, Australia |
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Abstract: | Many of the world’s soils are zinc (Zn) deficient. Consequently, many crops experience reduced growth, yield and tissue Zn
concentrations. Reduced concentrations of Zn in the edible portions of crops have important implications for human Zn nutrition;
this is a cause of global concern. Most terrestrial plant species form arbuscular mycorrhizas (AM) with a relatively limited
number of specialized soil fungi. Arbuscular mycorrhizal fungi (AMF) can take up nutrients, including Zn, and transfer them
to the plant, thereby enhancing plant nutrition. Under high soil Zn concentrations the formation of AM can also ‘protect’
against the accumulation of Zn in plant tissues to high concentrations. Here, a short review focusing on the role of AM in
enhancing plant Zn nutrition, principally under low soil Zn concentrations, is presented. Effects of Zn on the colonisation
of roots by AMF, direct uptake of Zn by AMF, the role of AM in the Zn nutrition of field grown plants, and emerging aspects
of Zn molecular physiology of AM, are explored. Emergent knowledge gaps are identified and discussed in the context of potential
future research. |
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Keywords: | Arbuscular mycorrhizas Colonisation Nutrient uptake Plant nutrition Zinc |
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