Comparative effects of auxin transport inhibitors on rhizogenesis and mycorrhizal establishment of spruce seedlings inoculated with Laccaria bicolor.
Identifieur interne : 003897 ( Main/Corpus ); précédent : 003896; suivant : 003898Comparative effects of auxin transport inhibitors on rhizogenesis and mycorrhizal establishment of spruce seedlings inoculated with Laccaria bicolor.
Auteurs : Ana Rinc N ; Outi Priha ; Bruno Sotta ; Magda Bonnet ; François Le TaconSource :
- Tree physiology [ 0829-318X ] ; 2003.
English descriptors
- KwdEn :
- Agaricales (physiology), Indoleacetic Acids (antagonists & inhibitors), Mycorrhizae (physiology), Phthalimides (pharmacology), Picea (microbiology), Picea (physiology), Plant Roots (microbiology), Plant Roots (physiology), Seedlings (microbiology), Seedlings (physiology), Trees (microbiology), Trees (physiology), Triiodobenzoic Acids (pharmacology).
- MESH :
- chemical , antagonists & inhibitors : Indoleacetic Acids.
- chemical , pharmacology : Phthalimides, Triiodobenzoic Acids.
- microbiology : Picea, Plant Roots, Seedlings, Trees.
- physiology : Agaricales, Mycorrhizae, Picea, Plant Roots, Seedlings, Trees.
Abstract
We compared the effects of two auxin transport inhibitors (2,3,5-triiodobenzoic acid (TIBA) and 1-N-naphthylphthalamic acid (NPA)) on rhizogenesis and mycorrhizal establishment of Picea abies L. (Karst.) seedlings inoculated with Laccaria bicolor S238N (Maire) Orton. Inoculation of seedlings with L. bicolor under in vitro conditions strongly increased host root and shoot growth. Although TIBA had no effect on taproot growth, NPA decreased taproot growth and deformed the root apex into a globular shape in both non-inoculated seedlings and seedlings inoculated with L. bicolor. Inoculation with L. bicolor strongly increased lateral rhizogenesis of the seedlings, and application of 100 microM indole-3-acetic acid (IAA) partially reproduced this effect. Although TIBA completely inhibited the stimulatory effect of L. bicolor on lateral root formation, NPA inhibited it only partially. Both TIBA and NPA counteracted the effect of exogenous IAA on lateral rhizogenesis. Inoculation with L. bicolor significantly increased shoot growth and seedling dry biomass, whereas application of exogenous IAA had no effect on either parameter. There was no effect of NPA on shoot growth and biomass production. The presence of TIBA completely prevented the development of ectomycorrhizal structures (mantle and Hartig net). In the presence of NPA, the number of seedlings colonized by the fungus was reduced and the degree of development of ectomycorrhizal structures was variable, but not completely prevented. In medium lacking tryptophan, neither TIBA nor NPA inhibited the release of IAA produced by L. bicolor in pure culture. When 100 microM tryptophan was added to the medium, TIBA significantly increased the amount of IAA released by the fungus, whereas NPA had no significant effect. We conclude that fungal IAA plays an important role in plant rhizogenesis and in the establishment of ectomycorrhizal symbiosis.
DOI: 10.1093/treephys/23.11.785
PubMed: 12839732
Links to Exploration step
pubmed:12839732Le document en format XML
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<author><name sortKey="Rinc N, Ana" sort="Rinc N, Ana" uniqKey="Rinc N A" first="Ana" last="Rinc N">Ana Rinc N</name>
<affiliation><nlm:affiliation>Unité Mixte de Recherches Interactions Arbres-Microorganismes, INRA Centre de Nancy, 54280 Champenoux, France.</nlm:affiliation>
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<author><name sortKey="Priha, Outi" sort="Priha, Outi" uniqKey="Priha O" first="Outi" last="Priha">Outi Priha</name>
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<author><name sortKey="Sotta, Bruno" sort="Sotta, Bruno" uniqKey="Sotta B" first="Bruno" last="Sotta">Bruno Sotta</name>
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<author><name sortKey="Bonnet, Magda" sort="Bonnet, Magda" uniqKey="Bonnet M" first="Magda" last="Bonnet">Magda Bonnet</name>
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<author><name sortKey="Le Tacon, Francois" sort="Le Tacon, Francois" uniqKey="Le Tacon F" first="François" last="Le Tacon">François Le Tacon</name>
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<sourceDesc><biblStruct><analytic><title xml:lang="en">Comparative effects of auxin transport inhibitors on rhizogenesis and mycorrhizal establishment of spruce seedlings inoculated with Laccaria bicolor.</title>
<author><name sortKey="Rinc N, Ana" sort="Rinc N, Ana" uniqKey="Rinc N A" first="Ana" last="Rinc N">Ana Rinc N</name>
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<author><name sortKey="Bonnet, Magda" sort="Bonnet, Magda" uniqKey="Bonnet M" first="Magda" last="Bonnet">Magda Bonnet</name>
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<author><name sortKey="Le Tacon, Francois" sort="Le Tacon, Francois" uniqKey="Le Tacon F" first="François" last="Le Tacon">François Le Tacon</name>
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<series><title level="j">Tree physiology</title>
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<term>Phthalimides (pharmacology)</term>
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<term>Plant Roots (microbiology)</term>
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<term>Plant Roots</term>
<term>Seedlings</term>
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<front><div type="abstract" xml:lang="en">We compared the effects of two auxin transport inhibitors (2,3,5-triiodobenzoic acid (TIBA) and 1-N-naphthylphthalamic acid (NPA)) on rhizogenesis and mycorrhizal establishment of Picea abies L. (Karst.) seedlings inoculated with Laccaria bicolor S238N (Maire) Orton. Inoculation of seedlings with L. bicolor under in vitro conditions strongly increased host root and shoot growth. Although TIBA had no effect on taproot growth, NPA decreased taproot growth and deformed the root apex into a globular shape in both non-inoculated seedlings and seedlings inoculated with L. bicolor. Inoculation with L. bicolor strongly increased lateral rhizogenesis of the seedlings, and application of 100 microM indole-3-acetic acid (IAA) partially reproduced this effect. Although TIBA completely inhibited the stimulatory effect of L. bicolor on lateral root formation, NPA inhibited it only partially. Both TIBA and NPA counteracted the effect of exogenous IAA on lateral rhizogenesis. Inoculation with L. bicolor significantly increased shoot growth and seedling dry biomass, whereas application of exogenous IAA had no effect on either parameter. There was no effect of NPA on shoot growth and biomass production. The presence of TIBA completely prevented the development of ectomycorrhizal structures (mantle and Hartig net). In the presence of NPA, the number of seedlings colonized by the fungus was reduced and the degree of development of ectomycorrhizal structures was variable, but not completely prevented. In medium lacking tryptophan, neither TIBA nor NPA inhibited the release of IAA produced by L. bicolor in pure culture. When 100 microM tryptophan was added to the medium, TIBA significantly increased the amount of IAA released by the fungus, whereas NPA had no significant effect. We conclude that fungal IAA plays an important role in plant rhizogenesis and in the establishment of ectomycorrhizal symbiosis.</div>
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<Abstract><AbstractText>We compared the effects of two auxin transport inhibitors (2,3,5-triiodobenzoic acid (TIBA) and 1-N-naphthylphthalamic acid (NPA)) on rhizogenesis and mycorrhizal establishment of Picea abies L. (Karst.) seedlings inoculated with Laccaria bicolor S238N (Maire) Orton. Inoculation of seedlings with L. bicolor under in vitro conditions strongly increased host root and shoot growth. Although TIBA had no effect on taproot growth, NPA decreased taproot growth and deformed the root apex into a globular shape in both non-inoculated seedlings and seedlings inoculated with L. bicolor. Inoculation with L. bicolor strongly increased lateral rhizogenesis of the seedlings, and application of 100 microM indole-3-acetic acid (IAA) partially reproduced this effect. Although TIBA completely inhibited the stimulatory effect of L. bicolor on lateral root formation, NPA inhibited it only partially. Both TIBA and NPA counteracted the effect of exogenous IAA on lateral rhizogenesis. Inoculation with L. bicolor significantly increased shoot growth and seedling dry biomass, whereas application of exogenous IAA had no effect on either parameter. There was no effect of NPA on shoot growth and biomass production. The presence of TIBA completely prevented the development of ectomycorrhizal structures (mantle and Hartig net). In the presence of NPA, the number of seedlings colonized by the fungus was reduced and the degree of development of ectomycorrhizal structures was variable, but not completely prevented. In medium lacking tryptophan, neither TIBA nor NPA inhibited the release of IAA produced by L. bicolor in pure culture. When 100 microM tryptophan was added to the medium, TIBA significantly increased the amount of IAA released by the fungus, whereas NPA had no significant effect. We conclude that fungal IAA plays an important role in plant rhizogenesis and in the establishment of ectomycorrhizal symbiosis.</AbstractText>
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