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Mycorrhizal symbiosis alleviates Mn toxicity and downregulates Mn transporter genes in Eucalyptus tereticornis under contrasting soil phosphorus

Background and aims Tropical soils often present two issues that can hinder plant growth: low phosphorus (P) and high manganese (Mn) availability. Eucalyptus tereticornis is frequently cultivated in such soils. We investigated the effects of Mn in E. tereticornis under contrasting soil P availabilit...

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Published in:Plant and soil 2023-08, Vol.489 (1-2), p.361-383
Main Authors: De Oliveira, Vinicius H., Montanha, Gabriel S., Carvalho, Hudson W. P., Mazzafera, Paulo, de Andrade, Sara Adrián L.
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description Background and aims Tropical soils often present two issues that can hinder plant growth: low phosphorus (P) and high manganese (Mn) availability. Eucalyptus tereticornis is frequently cultivated in such soils. We investigated the effects of Mn in E. tereticornis under contrasting soil P availability and hypothesized that arbuscular mycorrhizal (AM) symbiosis could alleviate Mn toxicity by improving P nutrition and altering the expression of Mn transporter genes. Methods Inoculated (AM) and non-inoculated (NM) seedlings grew for seven months in a soil with low or sufficient P availability, under three Mn doses: control, 75 and 150 mg kg −1 Mn. We assessed growth, AM colonization, nutrient concentrations, and the expression of eight genes related to Mn transport and homeostasis in roots. Mn distribution at one-leaf level was determined by μ-XRF. Results Low P exacerbated Mn toxicity and hindered plant growth. Mycorrhizal symbiosis did not influence Mn accumulation, but improved growth and Mn tolerance at low P, partly by improving P nutrition. At sufficient P, foliar Mn reached 3500 mg kg −1 , and μ-XRF patterns suggest preferential accumulation in the leaf lamina compared to margins or midribs. In NM plants, the vacuolar transporters EtVIT1 and EtMTP8 and the Mn-nicotianamine influx transporter EtYSL6 were the most responsive genes to Mn, while in AM roots most were downregulated. Conclusion Vacuolar sequestration and transport of complexed Mn are important mechanisms behind Mn tolerance in E. tereticornis . We propose that Mn is transported via the mycorrhizal pathway, explaining why it does not elicit the same molecular response observed in NM roots.
doi_str_mv 10.1007/s11104-023-06024-4
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P. ; Mazzafera, Paulo ; de Andrade, Sara Adrián L.</creator><creatorcontrib>De Oliveira, Vinicius H. ; Montanha, Gabriel S. ; Carvalho, Hudson W. P. ; Mazzafera, Paulo ; de Andrade, Sara Adrián L.</creatorcontrib><description>Background and aims Tropical soils often present two issues that can hinder plant growth: low phosphorus (P) and high manganese (Mn) availability. Eucalyptus tereticornis is frequently cultivated in such soils. We investigated the effects of Mn in E. tereticornis under contrasting soil P availability and hypothesized that arbuscular mycorrhizal (AM) symbiosis could alleviate Mn toxicity by improving P nutrition and altering the expression of Mn transporter genes. Methods Inoculated (AM) and non-inoculated (NM) seedlings grew for seven months in a soil with low or sufficient P availability, under three Mn doses: control, 75 and 150 mg kg −1 Mn. We assessed growth, AM colonization, nutrient concentrations, and the expression of eight genes related to Mn transport and homeostasis in roots. Mn distribution at one-leaf level was determined by μ-XRF. Results Low P exacerbated Mn toxicity and hindered plant growth. Mycorrhizal symbiosis did not influence Mn accumulation, but improved growth and Mn tolerance at low P, partly by improving P nutrition. At sufficient P, foliar Mn reached 3500 mg kg −1 , and μ-XRF patterns suggest preferential accumulation in the leaf lamina compared to margins or midribs. In NM plants, the vacuolar transporters EtVIT1 and EtMTP8 and the Mn-nicotianamine influx transporter EtYSL6 were the most responsive genes to Mn, while in AM roots most were downregulated. Conclusion Vacuolar sequestration and transport of complexed Mn are important mechanisms behind Mn tolerance in E. tereticornis . We propose that Mn is transported via the mycorrhizal pathway, explaining why it does not elicit the same molecular response observed in NM roots.</description><identifier>ISSN: 0032-079X</identifier><identifier>EISSN: 1573-5036</identifier><identifier>DOI: 10.1007/s11104-023-06024-4</identifier><language>eng</language><publisher>Cham: Springer International Publishing</publisher><subject>Accumulation ; Agriculture ; Analysis ; Arbuscular mycorrhizas ; Availability ; Biomedical and Life Sciences ; Down-regulation ; Ecology ; Eucalyptus ; Eucalyptus tereticornis ; Gene expression ; Genes ; Growth ; Homeostasis ; Leaves ; Life Sciences ; Manganese ; Nicotianamine ; Nutrient concentrations ; Nutrient transport ; nutrition ; Phosphorus ; Phosphorus content ; Plant growth ; Plant Physiology ; Plant Sciences ; Research Article ; Roots ; Seedlings ; soil ; Soil investigations ; Soil Science &amp; Conservation ; Soils ; Symbiosis ; Toxicity ; Tropical environments ; Tropical soils ; vacuoles ; vesicular arbuscular mycorrhizae</subject><ispartof>Plant and soil, 2023-08, Vol.489 (1-2), p.361-383</ispartof><rights>The Author(s), under exclusive licence to Springer Nature Switzerland AG 2023. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.</rights><rights>COPYRIGHT 2023 Springer</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c391t-84baf2a382c43f45968cee2a0e2dab93272bcc3c619aa88842d373b03092cbd23</citedby><cites>FETCH-LOGICAL-c391t-84baf2a382c43f45968cee2a0e2dab93272bcc3c619aa88842d373b03092cbd23</cites><orcidid>0000-0002-6066-5827</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,776,780,27903,27904</link.rule.ids></links><search><creatorcontrib>De Oliveira, Vinicius H.</creatorcontrib><creatorcontrib>Montanha, Gabriel S.</creatorcontrib><creatorcontrib>Carvalho, Hudson W. P.</creatorcontrib><creatorcontrib>Mazzafera, Paulo</creatorcontrib><creatorcontrib>de Andrade, Sara Adrián L.</creatorcontrib><title>Mycorrhizal symbiosis alleviates Mn toxicity and downregulates Mn transporter genes in Eucalyptus tereticornis under contrasting soil phosphorus</title><title>Plant and soil</title><addtitle>Plant Soil</addtitle><description>Background and aims Tropical soils often present two issues that can hinder plant growth: low phosphorus (P) and high manganese (Mn) availability. Eucalyptus tereticornis is frequently cultivated in such soils. We investigated the effects of Mn in E. tereticornis under contrasting soil P availability and hypothesized that arbuscular mycorrhizal (AM) symbiosis could alleviate Mn toxicity by improving P nutrition and altering the expression of Mn transporter genes. Methods Inoculated (AM) and non-inoculated (NM) seedlings grew for seven months in a soil with low or sufficient P availability, under three Mn doses: control, 75 and 150 mg kg −1 Mn. We assessed growth, AM colonization, nutrient concentrations, and the expression of eight genes related to Mn transport and homeostasis in roots. Mn distribution at one-leaf level was determined by μ-XRF. Results Low P exacerbated Mn toxicity and hindered plant growth. Mycorrhizal symbiosis did not influence Mn accumulation, but improved growth and Mn tolerance at low P, partly by improving P nutrition. At sufficient P, foliar Mn reached 3500 mg kg −1 , and μ-XRF patterns suggest preferential accumulation in the leaf lamina compared to margins or midribs. In NM plants, the vacuolar transporters EtVIT1 and EtMTP8 and the Mn-nicotianamine influx transporter EtYSL6 were the most responsive genes to Mn, while in AM roots most were downregulated. 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P.</au><au>Mazzafera, Paulo</au><au>de Andrade, Sara Adrián L.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Mycorrhizal symbiosis alleviates Mn toxicity and downregulates Mn transporter genes in Eucalyptus tereticornis under contrasting soil phosphorus</atitle><jtitle>Plant and soil</jtitle><stitle>Plant Soil</stitle><date>2023-08-01</date><risdate>2023</risdate><volume>489</volume><issue>1-2</issue><spage>361</spage><epage>383</epage><pages>361-383</pages><issn>0032-079X</issn><eissn>1573-5036</eissn><abstract>Background and aims Tropical soils often present two issues that can hinder plant growth: low phosphorus (P) and high manganese (Mn) availability. Eucalyptus tereticornis is frequently cultivated in such soils. We investigated the effects of Mn in E. tereticornis under contrasting soil P availability and hypothesized that arbuscular mycorrhizal (AM) symbiosis could alleviate Mn toxicity by improving P nutrition and altering the expression of Mn transporter genes. Methods Inoculated (AM) and non-inoculated (NM) seedlings grew for seven months in a soil with low or sufficient P availability, under three Mn doses: control, 75 and 150 mg kg −1 Mn. We assessed growth, AM colonization, nutrient concentrations, and the expression of eight genes related to Mn transport and homeostasis in roots. Mn distribution at one-leaf level was determined by μ-XRF. Results Low P exacerbated Mn toxicity and hindered plant growth. Mycorrhizal symbiosis did not influence Mn accumulation, but improved growth and Mn tolerance at low P, partly by improving P nutrition. At sufficient P, foliar Mn reached 3500 mg kg −1 , and μ-XRF patterns suggest preferential accumulation in the leaf lamina compared to margins or midribs. In NM plants, the vacuolar transporters EtVIT1 and EtMTP8 and the Mn-nicotianamine influx transporter EtYSL6 were the most responsive genes to Mn, while in AM roots most were downregulated. Conclusion Vacuolar sequestration and transport of complexed Mn are important mechanisms behind Mn tolerance in E. tereticornis . We propose that Mn is transported via the mycorrhizal pathway, explaining why it does not elicit the same molecular response observed in NM roots.</abstract><cop>Cham</cop><pub>Springer International Publishing</pub><doi>10.1007/s11104-023-06024-4</doi><tpages>23</tpages><orcidid>https://orcid.org/0000-0002-6066-5827</orcidid></addata></record>
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subjects Accumulation
Agriculture
Analysis
Arbuscular mycorrhizas
Availability
Biomedical and Life Sciences
Down-regulation
Ecology
Eucalyptus
Eucalyptus tereticornis
Gene expression
Genes
Growth
Homeostasis
Leaves
Life Sciences
Manganese
Nicotianamine
Nutrient concentrations
Nutrient transport
nutrition
Phosphorus
Phosphorus content
Plant growth
Plant Physiology
Plant Sciences
Research Article
Roots
Seedlings
soil
Soil investigations
Soil Science & Conservation
Soils
Symbiosis
Toxicity
Tropical environments
Tropical soils
vacuoles
vesicular arbuscular mycorrhizae
title Mycorrhizal symbiosis alleviates Mn toxicity and downregulates Mn transporter genes in Eucalyptus tereticornis under contrasting soil phosphorus
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