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Gualtieri, G.; Bisseling, Ton

doi:10.1023/a:1006396525292

Cited by 117 publications

(5 citation statements)

References 38 publications

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“…Studies of the diversity of legume and actinorhizal nodulation suggest that both the invasion process as well as the development of the nodule can occur in several ways (Hirsch and LaRue 1997;Gualtieri and Bisseling 2000;Sprent 2007). Invasion can be via crack entry of bacteria between epidermal and cortical cells, often at sites of lateral or adventitious root emergence, or via infection threads.…”

Section: Diversity Of Nodule Types In Nitrogen Fixing Symbiosesmentioning

confidence: 99%

Auxin: at the root of nodule development?

Mathesius

2008

Functional Plant Biol.

139

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Abstract. Root nodules are formed as a result of an orchestrated exchange of chemical signals between symbiotic nitrogen fixing bacteria and certain plants. In plants that form nodules in symbiosis with actinorhizal bacteria, nodules are derived from lateral roots. In most legumes, nodules are formed de novo from pericycle and cortical cells that are re-stimulated for division and differentiation by rhizobia. The ability of plants to nodulate has only evolved recently and it has, therefore, been suggested that nodule development is likely to have co-opted existing mechanisms for development and differentiation from lateral root formation. Auxin is an important regulator of cell division and differentiation, and changes in auxin accumulation and transport are essential for lateral root development. There is growing evidence that rhizobia alter the root auxin balance as a prerequisite for nodule formation, and that nodule numbers are regulated by shoot-to-root auxin transport. Whereas auxin requirements appear to be similar for lateral root and nodule primordium activation and organ differentiation, the major difference between the two developmental programs lies in the specification of founder cells. It is suggested that differing ratios of auxin and cytokinin are likely to specify the precursors of the different root organs.

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Section: Diversity Of Nodule Types In Nitrogen Fixing Symbiosesmentioning

confidence: 99%

Auxin: at the root of nodule development?

Mathesius

2008

Functional Plant Biol.

139

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“…The intracellular mode of infection occurs in most of the rhizobia-legume symbioses studied and it is tightly controlled by the host. Intercellular infection may take place via natural wounds, where lateral roots emerge through epidermal breaks (crack infection), or it may occur directly between epidermal cells or between an epidermal cell and an adjacent root hair (Gualtieri and Bisseling, 2000 ; Vega-Hernández et al, 2001 ; González-Sama et al, 2004 ; reviewed in Sprent, 2009 ; and in Ibáñez et al, 2017 ). At least 25% of all legume genera may undergo non-hair rhizobia infection and their nodules lack ITs (Sprent, 2007 ).…”

Section: Introductionmentioning

confidence: 99%

The Symbiosome: Legume and Rhizobia Co-evolution toward a Nitrogen-Fixing Organelle?

et al. 2018

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In legume nodules, symbiosomes containing endosymbiotic rhizobial bacteria act as temporary plant organelles that are responsible for nitrogen fixation, these bacteria develop mutual metabolic dependence with the host legume. In most legumes, the rhizobia infect post-mitotic cells that have lost their ability to divide, although in some nodules cells do maintain their mitotic capacity after infection. Here, we review what is currently known about legume symbiosomes from an evolutionary and developmental perspective, and in the context of the different interactions between diazotroph bacteria and eukaryotes. As a result, it can be concluded that the symbiosome possesses organelle-like characteristics due to its metabolic behavior, the composite origin and differentiation of its membrane, the retargeting of host cell proteins, the control of microsymbiont proliferation and differentiation by the host legume, and the cytoskeletal dynamics and symbiosome segregation during the division of rhizobia-infected cells. Different degrees of symbiosome evolution can be defined, specifically in relation to rhizobial infection and to the different types of nodule. Thus, our current understanding of the symbiosome suggests that it might be considered a nitrogen-fixing link in organelle evolution and that the distinct types of legume symbiosomes could represent different evolutionary stages toward the generation of a nitrogen-fixing organelle.

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“…Additionally, ENOD2-like expression was detected in the stems, flowers and roots of non-nodulating tree legumes, Styphnolobium japonicum and Cladrastis kentukea (Foster et al 2000). Due to the growing evidence that what was first thought to be nodule specific genes are also expressed in other parts of different plants, it has been proposed that genes involved in nodulation, such as ENOD2, are evolved from genes involved in general physiological processes which are common to most plants (Gualtieri & Bisseling 2000).…”

Section: Gus Expression In Transformant Rootsmentioning

confidence: 99%

The Expression of Genes Encoding Secreted Proteins in Medicago truncatula A17 Inoculated Roots

Kusumawati

Kuran

Imin

et al. 2013

HAYATI Journal of Biosciences

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Subtilisin-like serine protease (MtSBT), serine carboxypeptidase (MtSCP), MtN5, non-specific lipid transfer protein (MtnsLTP), early nodulin2-like protein (MtENOD2-like), FAD-binding domain containing protein (MtFAD-BP1), and rhicadhesin receptor protein (MtRHRE1) were among 34 proteins found in the supernatant of M. truncatula 2HA and sickle cell suspension cultures. This study investigated the expression of genes encoding those proteins in roots and developing nodules. Two methods were used: quantitative real time RT-PCR and gene expression analysis (with promoter:GUS fusion) in roots. Those proteins are predicted as secreted proteins which is indirectly supported by the findings that promoter:GUS fusions of six of the seven genes encoding secreted proteins were strongly expressed in the vascular bundle of transgenic hairy roots. All six genes have expressed in 14-day old nodule. The expression levels of the selected seven genes were quantified in Sinorhizobiuminoculated and control plants using quantitative real time RT-PCR. In conclusion, among seven genes encoding secreted proteins analyzed, the expression level of only one gene, MtN5, was up-regulated significantly in inoculated root segments compared to controls. The expression of MtSBT1, MtSCP1, MtnsLTP, MtFAD-BP1, MtRHRE1 and MtN5 were higher in root tip than in other tissues examined.

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Cited by 117 publications

References 38 publications

Auxin: at the root of nodule development?

Auxin: at the root of nodule development?

The Symbiosome: Legume and Rhizobia Co-evolution toward a Nitrogen-Fixing Organelle?

The Expression of Genes Encoding Secreted Proteins in Medicago truncatula A17 Inoculated Roots

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