Serveur d'exploration sur la mycorhize

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Violets of the section Melanium, their colonization by arbuscular mycorrhizal fungi and their occurrence on heavy metal heaps.

Identifieur interne : 002236 ( Main/Exploration ); précédent : 002235; suivant : 002237

Violets of the section Melanium, their colonization by arbuscular mycorrhizal fungi and their occurrence on heavy metal heaps.

Auteurs : A. Słomka [Pologne] ; E. Kuta ; G. Szarek-Łukaszewska ; B. Godzik ; P. Kapusta ; G. Tylko ; H. Bothe

Source :

RBID : pubmed:21492955

Descripteurs français

English descriptors

Abstract

Violets of the sections Melanium were examined for their colonization by arbuscular mycorrhizal fungi (AMF). Heartsease (Viola tricolor) from several heavy metal soils was AMF-positive at many sites but not at extreme biomes. The zinc violets Viola lutea ssp. westfalica (blue zinc violet) and ssp. calaminaria (yellow zinc violet) were always AMF-positive on heavy metal soils as their natural habitats. As shown for the blue form, zinc violets germinate independently of AMF and can be grown in non-polluted garden soils. Thus the zinc violets are obligatorily neither mycotrophs nor metalophytes. The alpine V. lutea, likely ancestor of the zinc violets, was at best poorly colonized by AMF. As determined by atomic absorption spectrometry, the contents of Zn and Pb were lower in AMF colonized plants than in the heavy metal soils from where the samples had been taken. AMF might prevent the uptake of toxic levels of heavy metals into the plant organs. Dithizone staining indicated a differential deposition of heavy metals in tissues of heartsease. Leaf hairs were particularly rich in heavy metals, indicating that part of the excess of heavy metals is sequestered into these cells.

DOI: 10.1016/j.jplph.2011.01.033
PubMed: 21492955


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Le document en format XML

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<term>Analysis of Variance (MeSH)</term>
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<term>Germination (MeSH)</term>
<term>Metals, Heavy (analysis)</term>
<term>Metals, Heavy (metabolism)</term>
<term>Mycorrhizae (growth & development)</term>
<term>Plant Leaves (chemistry)</term>
<term>Plant Roots (chemistry)</term>
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<term>Feuilles de plante (composition chimique)</term>
<term>Germination (MeSH)</term>
<term>Microbiologie du sol (MeSH)</term>
<term>Mycorhizes (croissance et développement)</term>
<term>Métaux lourds (analyse)</term>
<term>Métaux lourds (métabolisme)</term>
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<term>Racines de plante (microbiologie)</term>
<term>Spectrophotométrie atomique (MeSH)</term>
<term>Tiges de plante (composition chimique)</term>
<term>Viola (composition chimique)</term>
<term>Viola (croissance et développement)</term>
<term>Viola (microbiologie)</term>
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<div type="abstract" xml:lang="en">Violets of the sections Melanium were examined for their colonization by arbuscular mycorrhizal fungi (AMF). Heartsease (Viola tricolor) from several heavy metal soils was AMF-positive at many sites but not at extreme biomes. The zinc violets Viola lutea ssp. westfalica (blue zinc violet) and ssp. calaminaria (yellow zinc violet) were always AMF-positive on heavy metal soils as their natural habitats. As shown for the blue form, zinc violets germinate independently of AMF and can be grown in non-polluted garden soils. Thus the zinc violets are obligatorily neither mycotrophs nor metalophytes. The alpine V. lutea, likely ancestor of the zinc violets, was at best poorly colonized by AMF. As determined by atomic absorption spectrometry, the contents of Zn and Pb were lower in AMF colonized plants than in the heavy metal soils from where the samples had been taken. AMF might prevent the uptake of toxic levels of heavy metals into the plant organs. Dithizone staining indicated a differential deposition of heavy metals in tissues of heartsease. Leaf hairs were particularly rich in heavy metals, indicating that part of the excess of heavy metals is sequestered into these cells.</div>
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