Molecular Biology Of Actinorhizal Symbioses

Laplaze, Laurent; Svistoonoff, Sergio; Santi, Carole; Auguy, Florence; Franche, Claudine; Bogusz, Didier

doi:10.1007/978-1-4020-3547-0_9

Cited by 12 publications

(8 citation statements)

References 113 publications

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“…The actual function of the prenodule was investigated in Casuarina glauca. A study of symbiosis-related gene expression coupled with cellular modification (cell wall lignification) indicated that prenodules displayed the same characteristics as nodules and hence could be considered very simple symbiotic organs (Laplaze et al 2000(Laplaze et al , 2008. Thus, sequential differentiation of prenodules and then nodules constitutes a major difference from the situation in legumes, where cortical cell divisions lead to formation of a unique nodule primordium evolving into a mature nodule.…”

Section: Infection Processmentioning

confidence: 97%

“…Heterologous probing and differential screening of nodule cDNA libraries with root and nodule-specific cDNA resulted in isolation and characterization of more than 25 nodule-specific or nodule-enhanced plant genes in several actinorhizal plants, including Alnus, Datisca, Eleagnus and Casuarina (Pawlowski and Bisseling 1996;Laplaze et al 2008;Pawlowski and Sprent, 2008). One of the earliest symbiotic genes characterized thus far is cg12, which encodes a subtilisin-like protease expressed in Frankiainfected root hairs of C. glauca (Svistoonoff et al 2003).…”

Section: Molecular Biology and Actinorhizal Nodule And Plant Gene Expmentioning

confidence: 99%

“…Based on cytological and gene expression studies, four zones are recognized in mature actinorhizal nodules (Duhoux et al 1996;Laplaze et al 2008). Zone I is the apical meristem free of Frankia.…”

Section: Nodule Development and Functioningmentioning

confidence: 99%

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Nitrogen-fixing bacteria associated with leguminous and non-leguminous plants

2008

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Nitrogen is generally considered one of the major limiting nutrients in plant growth. The biological process responsible for reduction of molecular nitrogen into ammonia is referred to as nitrogen fixation. A wide diversity of nitrogen-fixing bacterial species belonging to most phyla of the Bacteria domain have the capacity to colonize the rhizosphere and to interact with plants. Leguminous and actinorhizal plants can obtain their nitrogen by association with rhizobia or Frankia via differentiation on their respective host plants of a specialized organ, the root nodule. Other symbiotic associations involve heterocystous cyanobacteria, while increasing numbers of nitrogen-fixing species have been identified as colonizing the root surface and, in some cases, the root interior of a variety of cereal crops and pasture grasses. Basic and advanced aspects of these associations are covered in this review.

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Section: Infection Processmentioning

confidence: 97%

Section: Molecular Biology and Actinorhizal Nodule And Plant Gene Expmentioning

confidence: 99%

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Nitrogen-fixing bacteria associated with leguminous and non-leguminous plants

2008

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“…Great efforts are currently underway to identify the changes in the global patterns of gene expression occuring during different stages of the symbiotic interaction by using microarray technologies in the actinorhizal plants C. glauca, A. glutinosa and D. glomerata (Hocher et al 2006;Laplaze et al 2008). The goal is to identify key genes involved in nodule development, and to perform comparative analysis of the symbiotic process in actinorhizal plants and legumes.…”

Section: Future Directionsmentioning

confidence: 99%

“…Molecular approaches have been developed to understand changes in gene expression resulting from the interaction with the actinomycete. The use of genomics combined with advanced molecular biology methods recently led to significant progress in knowledge of the molecular mechanisms underlying the interaction between Frankia and the most widely-studied actinorhizal species C. glauca, Alnus glutinosa and Datisca glomerata (Hocher et al 2006;Laplaze et al 2008;Pawlowski 2002;Pawlowski and Sprent 2008). In 2007, the genome sequencing of three Frankia strains was completed (Normand et al 2007a, b;Rawnsley and Tisa 2007).…”

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confidence: 99%

Contribution of transgenic Casuarinaceae to our knowledge of the actinorhizal symbioses

et al. 2009

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The Casuarinaceae family is a group of 96 species of trees and shrubs that are tolerant to adverse soil and climatic conditions. In the field, Casuarinaceae bears nitrogen-fixing root nodules (so called actinorhizal nodules) resulting from infection by the soil actinomycete Frankia. The association between Casuarina and Frankia is of tremendous ecological importance in tropical and subtropical areas where these trees contribute to land stabilization and soil reclamation. During differentiation of the actinorhizal nodule, a set of genes called actinorhizal nodulins is activated in the developing nodule. Understanding the molecular basis of actinorhizal nodule ontogenesis requires molecular tools such as genomics together with gene transfer technologies for functional analysis of symbiotic genes. Using the biological vectors Agrobacterium rhizogenes and A. tumefaciens, gene transfer into the two species Allocasuarina verticillata and Casuarina glauca has been successful. Transgenic Casuarinaceae plants proved to be valuable tools for exploring the molecular mechanisms resulting from the infection process of actinorhizal plants by Frankia.

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