Action spectrum for the induction of hyphal branches of an arbuscular mycorrhizal fungus: exposure sites versus branching sites.
Identifieur interne : 003845 ( Main/Corpus ); précédent : 003844; suivant : 003846Action spectrum for the induction of hyphal branches of an arbuscular mycorrhizal fungus: exposure sites versus branching sites.
Auteurs : Gerald Nagahashi ; David D. DoudsSource :
- Mycological research [ 0953-7562 ] ; 2003.
English descriptors
- KwdEn :
- MESH :
- chemical , physiology : Photoreceptors, Microbial.
- growth & development : Mycorrhizae.
- microbiology : Paspalum.
- physiology : Mycorrhizae.
- radiation effects : Mycorrhizae, Photoreceptors, Microbial.
- Light, Photobiology.
Abstract
The first action spectrum for a photo-induced response of an arbuscular mycorrhizal fungus is reported. At low light intensity, the responsive wavelengths for light-induced hyphal branching of the primary germ tube of Gigaspora gigantea were determined to be in the blue to uv-A range. The action spectrum showed the greatest stimulation of branching occurred around 390 nm although a shoulder was observed between 360-370 nm. A second major peak of light-induced branching occurred at 430 nm. The exposure of specific areas of the germ tube to high intensity blue light for a short period led to several interesting observations. By exposing 2 mm segments (0-2, 2-4, 4-6, etc.) or 3 mm segments away from the tip, it was determined that photoinduction of hyphal branches could occur anywhere along the axis of a growing germ tube except in the apical 2 mm. When 3 mm segments were exposed at greater distances from the tip (6-9, 9-12, and up to 33-36 mm), branches frequently formed in areas not directly exposed to light. The branches were usually in clusters which were spaced approximately 3 or 6 mm apart. Since light scattering could be ruled out, these results indicated that the exposure sites and sites of hyphal branching did not necessarily coincide and suggested the probable involvement of a second messenger during this blue light-induced event.
DOI: 10.1017/s0953756203008232
PubMed: 14563135
Links to Exploration step
pubmed:14563135Le document en format XML
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<author><name sortKey="Nagahashi, Gerald" sort="Nagahashi, Gerald" uniqKey="Nagahashi G" first="Gerald" last="Nagahashi">Gerald Nagahashi</name>
<affiliation><nlm:affiliation>USDA Agricultural Research Service, Eastern Regional Research Center, 600 East Mermaid Lane, Wyndmoor, PA 19038, USA. gnagahashi@arserrc.gov</nlm:affiliation>
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<author><name sortKey="Douds, David D" sort="Douds, David D" uniqKey="Douds D" first="David D" last="Douds">David D. Douds</name>
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<author><name sortKey="Douds, David D" sort="Douds, David D" uniqKey="Douds D" first="David D" last="Douds">David D. Douds</name>
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<series><title level="j">Mycological research</title>
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<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Light (MeSH)</term>
<term>Mycorrhizae (growth & development)</term>
<term>Mycorrhizae (physiology)</term>
<term>Mycorrhizae (radiation effects)</term>
<term>Paspalum (microbiology)</term>
<term>Photobiology (MeSH)</term>
<term>Photoreceptors, Microbial (physiology)</term>
<term>Photoreceptors, Microbial (radiation effects)</term>
</keywords>
<keywords scheme="MESH" type="chemical" qualifier="physiology" xml:lang="en"><term>Photoreceptors, Microbial</term>
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<keywords scheme="MESH" qualifier="growth & development" xml:lang="en"><term>Mycorrhizae</term>
</keywords>
<keywords scheme="MESH" qualifier="microbiology" xml:lang="en"><term>Paspalum</term>
</keywords>
<keywords scheme="MESH" qualifier="physiology" xml:lang="en"><term>Mycorrhizae</term>
</keywords>
<keywords scheme="MESH" qualifier="radiation effects" xml:lang="en"><term>Mycorrhizae</term>
<term>Photoreceptors, Microbial</term>
</keywords>
<keywords scheme="MESH" xml:lang="en"><term>Light</term>
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<front><div type="abstract" xml:lang="en">The first action spectrum for a photo-induced response of an arbuscular mycorrhizal fungus is reported. At low light intensity, the responsive wavelengths for light-induced hyphal branching of the primary germ tube of Gigaspora gigantea were determined to be in the blue to uv-A range. The action spectrum showed the greatest stimulation of branching occurred around 390 nm although a shoulder was observed between 360-370 nm. A second major peak of light-induced branching occurred at 430 nm. The exposure of specific areas of the germ tube to high intensity blue light for a short period led to several interesting observations. By exposing 2 mm segments (0-2, 2-4, 4-6, etc.) or 3 mm segments away from the tip, it was determined that photoinduction of hyphal branches could occur anywhere along the axis of a growing germ tube except in the apical 2 mm. When 3 mm segments were exposed at greater distances from the tip (6-9, 9-12, and up to 33-36 mm), branches frequently formed in areas not directly exposed to light. The branches were usually in clusters which were spaced approximately 3 or 6 mm apart. Since light scattering could be ruled out, these results indicated that the exposure sites and sites of hyphal branching did not necessarily coincide and suggested the probable involvement of a second messenger during this blue light-induced event.</div>
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<DateRevised><Year>2019</Year>
<Month>11</Month>
<Day>08</Day>
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<Issue>Pt 9</Issue>
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<Title>Mycological research</Title>
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<ArticleTitle>Action spectrum for the induction of hyphal branches of an arbuscular mycorrhizal fungus: exposure sites versus branching sites.</ArticleTitle>
<Pagination><MedlinePgn>1075-82</MedlinePgn>
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<Abstract><AbstractText>The first action spectrum for a photo-induced response of an arbuscular mycorrhizal fungus is reported. At low light intensity, the responsive wavelengths for light-induced hyphal branching of the primary germ tube of Gigaspora gigantea were determined to be in the blue to uv-A range. The action spectrum showed the greatest stimulation of branching occurred around 390 nm although a shoulder was observed between 360-370 nm. A second major peak of light-induced branching occurred at 430 nm. The exposure of specific areas of the germ tube to high intensity blue light for a short period led to several interesting observations. By exposing 2 mm segments (0-2, 2-4, 4-6, etc.) or 3 mm segments away from the tip, it was determined that photoinduction of hyphal branches could occur anywhere along the axis of a growing germ tube except in the apical 2 mm. When 3 mm segments were exposed at greater distances from the tip (6-9, 9-12, and up to 33-36 mm), branches frequently formed in areas not directly exposed to light. The branches were usually in clusters which were spaced approximately 3 or 6 mm apart. Since light scattering could be ruled out, these results indicated that the exposure sites and sites of hyphal branching did not necessarily coincide and suggested the probable involvement of a second messenger during this blue light-induced event.</AbstractText>
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