Rhizobial and Actinorhizal Symbioses: What Are the Shared Features?

Pawlowski, Katharina; Bisseling, Ton

doi:10.1105/tpc.8.10.1899

Cited by 174 publications

(104 citation statements)

References 103 publications

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“…Thus, some defense mechanisms appear to restrict bacterial growth in both incompatible and compatible interactions. In plant-symbiotic interactions, for example, with Rhizobium or mycorrhizai species, many of the known defense responses are activated (Gardner et al, 1996; see also Gianinazzi-Pearson, 1996, andPawlowski andBisseling, 1996, in this issue). 1s defense-gene activation in these compatible interactions of functional significance for pathogenesis or symbiosis or does it stop the entry of unwanted competitors?…”

Section: Discussionmentioning

confidence: 99%

Resistance gene-dependent plant defense responses.

1996

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Section: Discussionmentioning

confidence: 99%

Resistance gene-dependent plant defense responses.

1996

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“…These are indicated as question marks at the end of the ' inf ' and ' noi ' processes. This model might be useful in interpreting further studies on the mechanisms of induction of nodule genes (Pawlowski & Bisseling, 1996) and on the regulation of nodulation (Wall & Huss-Danell, 1997).…”

Section: mentioning

confidence: 99%

Time course of nodule development in the Discaria trinervis (Rhamnaceae) –Frankia symbiosis

Valverde

Wall

1999

New Phytologist

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The time course of initiation and development of root nodules was investigated in the South American actinorhizal shrub Discaria trinervis (Rhamnaceae). A local strain of Frankia (BCU110501) which was isolated from D. trinervis nodules, was used as inoculum. Inoculated seedlings were periodically studied under the light microscope after clearing with aqueous NaClO. In parallel, semithin and ultrathin sections were analysed by light and electron microscopy. Infection by Frankia BCU110501 involved intercellular penetration among epidermal and cortical root cells. Nodule primordia were detected from 6 d after inoculation, while bacteria were progressing through intercellular spaces of the outer layers of cortical cells. Invasion of host cells by the symbiont occurred 7-9 d after inoculation, and hypertrophy of the primordium cells was associated with Frankia penetration. Root hairs were not deformed during the early events of nodule formation. From 13 to 16 d after inoculation, the proximal cellular zone of the primordia behaved differently from the other tissues after NaClO treatment and remained darkly pigmented. At the same time, differentiation of Frankia vesicles started to occur inside already infected cells. By 16 d after inoculation, spherical vesicles of BCU110501 were homogeneously distributed in the host cells. These vesicles were septate and surrounded by void space. Frankia spores or sporangia were not observed in the nodule tissue. This study has clarified the mode of Frankia penetration in D. trinervis, one of the Rhamnaceae which also includes Ceanothus. The events involved in infection, nodule induction, host-cell infection and vesicle differentiation have been characterized and identified as time-segregated developmental processes in the ontogeny of D. trinervis root nodules.

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“…Actinorhizal root nodules are coralloid structures consisting of multiple nodule lobes, each of which is a modified lateral root without root cap, with a superficial periderm, a central vascular bundle, and both infected and uninfected cortical cells (Pawlowski and Bisseling 1996;Franche et al 1998).…”

mentioning

confidence: 99%

Characterization of a Casuarina glauca Nodule-Specific Subtilisin-like Protease Gene, a Homolog of Alnus glutinosa ag12

Laplaze¹,

Ribeiro²,

Franche³

et al. 2000

MPMI

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In search of plant genes expressed during early interactions between Casuarina glauca and Frankia, we have isolated and characterized a C. glauca gene that has strong homology to subtilisin-like protease gene families of several plants including the actinorhizal nodulin gene ag12 of another actinorhizal plant, Alnus glutinosa. Based on the expression pattern of cg12 in the course of nodule development, it represents an early actinorhizal nodulin gene. Our results suggest that subtilisin-like proteases may be a common element in the process of infection of plant cells by Frankia in both Betulaceae (Alnus glutinosa) and Casuarinaceae (Casuarina glauca) symbioses.Additional keyword: symbiosis.

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Rhizobial and Actinorhizal Symbioses: What Are the Shared Features?

Cited by 174 publications

References 103 publications

Resistance gene-dependent plant defense responses.

Resistance gene-dependent plant defense responses.

Time course of nodule development in the Discaria trinervis (Rhamnaceae) –Frankia symbiosis

Characterization of a Casuarina glauca Nodule-Specific Subtilisin-like Protease Gene, a Homolog of Alnus glutinosa ag12

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