Development of the Legume Root Nodule

Brewin, N. J.

doi:10.1146/annurev.cb.07.110191.001203

Cited by 444 publications

(225 citation statements)

References 75 publications

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“…The resulting nodules appear almost normal but are largely devoid of bacteria. Mditional evidence of interactions between the plant membrane and bacteria is provided by the attachment of the peribacteroid membrane (PBM) to components of the bacterial surface (Robertson et al, 1985;Verma and Fortin, 1989;Brewin, 1991). Moreover, an antibody prepared against the PBM also recognizes a protein in purified bacteroids (Fortin et al, 1985).…”

Section: Entry Of Bacteria In Eukaryotic Cellsmentioning

confidence: 99%

Signals in Root Nodule Organogenesis and Endocytosis of Rhizobium.

Verma

1992

Plant Cell

150

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Section: Entry Of Bacteria In Eukaryotic Cellsmentioning

confidence: 99%

Signals in Root Nodule Organogenesis and Endocytosis of Rhizobium.

Verma

1992

Plant Cell

150

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“…Through a complex exchange of chemical signals, S. meliloti induces root hair curling and nodule formation on alfalfa. S. meliloti organisms trapped in the curled root hairs invade M. sativa through a tube-like structure called an infection thread and are eventually released into the cells of the developing nodule, where they differentiate into nitrogen-fixing bacteroids (8,16).…”

mentioning

confidence: 99%

Disruption of sitA Compromises Sinorhizobium meliloti for Manganese Uptake Required for Protection against Oxidative Stress

Davies

Walker

2007

J Bacteriol

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During the initial stages of symbiosis with the host plant Medicago sativa, Sinorhizobium meliloti must overcome an oxidative burst produced by the plant in order for proper symbiotic development to continue. While identifying mutants defective in symbiosis and oxidative stress defense, we isolated a mutant with a transposon insertion mutation of sitA, which encodes the periplasmic binding protein of the putative iron/ manganese ABC transporter SitABCD. Disruption of sitA causes elevated sensitivity to the reactive oxygen species hydrogen peroxide and superoxide. Disruption of sitA leads to elevated catalase activity and a severe decrease in superoxide dismutase B (SodB) activity and protein level. The decrease in SodB level strongly correlates with the superoxide sensitivity of the sitA mutant. We demonstrate that all free-living phenotypes of the sitA mutant can be rescued by the addition of exogenous manganese but not iron, a result that strongly implies that SitABCD plays an important role in manganese uptake in S. meliloti.

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“…Nodulation is a highly complex process involving a succession of interactions between the host plant and the bacterium, from initial recognition and infection to nodule development and nodule function (5,8,14,20,22).…”

mentioning

confidence: 99%

“…There are two main types of nodule development, the so-called indeterminate and determinate types (5,14,22,24). Indeterminate nodules generally develop on temperate legumes, such as alfalfa, vetch, or pea.…”

mentioning

confidence: 99%

“…The persistent activity of the meristem, located at the outer extremity of the nodule, ensures nodule elongation for a number of weeks (41). While the meristem is active, rhizobia are released from the infection threads into the plant cell cytoplasm (5,14,17,24). The differentiation of both symbionts leads to the establishment of a central zone of the nodule, in which nitrogen is reduced (22,41).…”

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Root nodulation of Sesbania rostrata

et al. 1994

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The tropical legume Sesbania rostrata can be nodulated by Azorhizobium caulinodans on both its stem and its root system. Here we investigate in detail the process of root nodulation and show that nodules develop exclusively at the base of secondary roots. Intercellular infection leads to the formation of infection pockets, which then give rise to infection threads. Concomitantly with infection, cortical cells of the secondary roots dedifferentiate, forming a meristem which has an "open-basket" configuration and which surrounds the initial infection site. Bacteria are released from the tips of infection threads into plant cells via "infection droplets," each containing several bacteria. Initially, nodule differentiation is comparable to that of indeterminate nodules, with the youngest meristematic cells being located at the periphery and the nitrogen-fixing cells being located at the nodule center. Because of the peculiar form of the meristem, Sesbania root nodules develop uniformly around a central axis. Nitrogen fixation is detected as early as 3 days following inoculation, while the nodule meristem is still active. Two weeks after inoculation, meristematic activity ceases, and nodules then show the typical histology of determinate nodules. Thus, root nodule organogenesis in S. rostrata appears to be intermediate between indeterminate and determinate types.

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Development of the Legume Root Nodule

Cited by 444 publications

References 75 publications

Signals in Root Nodule Organogenesis and Endocytosis of Rhizobium.

Signals in Root Nodule Organogenesis and Endocytosis of Rhizobium.

Disruption of sitA Compromises Sinorhizobium meliloti for Manganese Uptake Required for Protection against Oxidative Stress

Root nodulation of Sesbania rostrata

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