Showing their mettle: extraradical mycelia of arbuscular mycorrhizae form a metal filter to improve host Al tolerance and P nutrition
Date
Authors
BORIE BORIE, FERNANDO RICARDO
Seguel, Alex
Meier, Felix
Azcón-G.-Aguilar, Rosario
Valentine, Alex J.
Meriño-Gergichevich, Cristian
Cornejo, Pablo E.
Aguilera, Paula
Borie, Fernando R.
Seguel, Alex
Meier, Felix
Azcón-G.-Aguilar, Rosario
Valentine, Alex J.
Meriño-Gergichevich, Cristian
Cornejo, Pablo E.
Aguilera, Paula
Borie, Fernando R.
Authors
Date
Datos de publicación:
10.1002/jsfa.10088
Keywords
Al Toxicity - Am Colonization - P Uptake - Wheat Genotypes - Aluminum - Phosphorus - Aluminum - Phosphorus - Soil Pollutants - Aluminum - Phosphorus - Analysis - Fungus Hyphae - Growth, Development And Aging - Metabolism - Microbiology - Mycelium - Mycorrhiza - Soil Pollutant - Toxicity - Wheat - Aluminum - Hyphae - Mycelium - Mycorrhizae - Phosphorus - Soil Pollutants - Triticum
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Abstract
BACKGROUND: New evidence has shown that arbuscular mycorrhizal (AM) fungi can contribute to the aluminum (Al3+) tolerance of host plants growing in acidic soils with phytotoxic levels of Al3+. The aim of this study was to investigate the role of AM fungi isolated from naturally occurring Al3+ acidic soils in conferring host tolerance to Al3+ toxicity in three wheat cultivars differing in Al3+ sensitivity. The experiment was conducted in a soilless substrate (vermiculite/perlite, 2:1 v/v) using two Al3+-tolerant wheat genotypes and one Al3+-sensitive wheat genotype. The wheat was colonized with a consortium of AM fungi isolated from an Andisol, with or without Al3+ at a concentration of 200 ?mol L?1. RESULTS: The response of wheat to Al3+ in the medium was dependent on both the plant genotype and AM colonization. The benefits of the AM fungi to the wheat cultivars included an increased P concentration and relatively low Al3+ accumulation in the plants. This was achieved through two mechanisms. First, the metal-chelating capacity of the AM fungi was clear in two of the cultivars ( Tukan and Porfiado ), in which the enhanced extraradical mycelium development was able to retain Al3+ in the glomalin and hyphae. Second, the increased AM-induced acid phosphatase activity in the rhizosphere of the other cultivar ( Atlas 66 ) increased host nutrition possibly by hyphae-mediated nutrient uptake and glomalin-related soil protein. CONCLUSION: The results suggest that the role of AM fungi in cultivar-specific Al3+ detoxification can be achieved by increased extraradical mycelial filters and enhanced bioavailability of P in the host rhizosphere. © 2019 Society of Chemical Industry. © 2020 Elsevier B.V., All rights reserved.
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Keywords
Al Toxicity , Am Colonization , P Uptake , Wheat Genotypes , Aluminum , Phosphorus , Aluminum , Phosphorus , Soil Pollutants , Aluminum , Phosphorus , Analysis , Fungus Hyphae , Growth, Development And Aging , Metabolism , Microbiology , Mycelium , Mycorrhiza , Soil Pollutant , Toxicity , Wheat , Aluminum , Hyphae , Mycelium , Mycorrhizae , Phosphorus , Soil Pollutants , Triticum
Citation
10.1002/jsfa.10088