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dc.contributor.author
Wall, Luis Gabriel
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dc.date.available
2019-03-15T19:28:59Z
dc.date.issued
2000-06
dc.identifier.citation
Wall, Luis Gabriel; The Actinorhizal Symbiosis; Springer; Journal of Plant Growth Regulation; 19; 2; 6-2000; 167-182
dc.identifier.issn
0721-7595
dc.identifier.uri
http://hdl.handle.net/11336/71779
dc.description.abstract
The term ``actinorhiza'' refers both to the filamentous bacteria Frankia, an actinomycete, and to the root location of nitrogen-fixing nodules. Actinorhizal plants are classified into four subclasses, eight families, and 25 genera comprising more than 220 species. Although ontogenically related to lateral roots, actinorhizal nodules are characterized by differentially expressed genes, supporting the idea of the uniqueness of this new organ. Two pathways for root infection have been described for compatible Frankia interactions: root hair infection or intercellular penetration. Molecular phylogeny groupings of host plants correlate with morphologic and anatomic features of actinorhizal nodules. Four clades of actinorhizal plants have been defined, whereas Frankia bacteria are classified into three major phylogenetic groups. Although the phylogenies of the symbionts are not fully congruent, a close relationship exists between plant and bacterial groups. A model for actinorhizal specificity is proposed that includes different levels or degrees of specificity of host-symbiont interactions, from fully compatible to incompatible. Intermediate, compatible, but delayed or limited interactions are also discussed. Actinorhizal plants undergo feedback regulation of symbiosis involving at least two different and consecutive signals that lead to a mechanism controlling root nodulation. These signals mediate the opening or closing of the window of susceptibility for infection and inhibit infection and nodule development in the growing root, independently of infection mechanism. The requirement for at least two molecular recognition steps in the development of actinorhizal symbioses is discussed.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Springer
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dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Frankia
dc.subject
Actinorhizal Symbiosis
dc.subject
Regulation of Nodulation
dc.subject
Biological Nitrogen Fixation
dc.subject.classification
Otras Ciencias Biológicas
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dc.subject.classification
Ciencias Biológicas
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dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
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dc.title
The Actinorhizal Symbiosis
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2019-03-14T14:11:13Z
dc.identifier.eissn
1435-8107
dc.journal.volume
19
dc.journal.number
2
dc.journal.pagination
167-182
dc.journal.pais
Alemania
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dc.journal.ciudad
Berlín
dc.description.fil
Fil: Wall, Luis Gabriel. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de Quilmes. Departamento de Ciencia y Tecnología; Argentina
dc.journal.title
Journal of Plant Growth Regulation
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dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/https://link.springer.com/article/10.1007/s003440000027
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://doi.org/10.1007/s003440000027
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