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Induction of actinorhizal nodules by Frankia
Stockholm University, Faculty of Science, Department of Botany.
2009 (English)In: Prokaryotic Symbionts in Plants / [ed] Katharina Pawlowski and Alexander Steinbüchel, Münster, Germany: Springer , 2009, 127-154 p.Chapter in book (Other (popular science, discussion, etc.))
Abstract [en]

Actinomycetous soil bacteria of the genus Frankia can induce the formation of nitrogen-fixing root nodules on a diverse group of host plants from eight angiosperm families, collectively called actinorhizal plants. Nodule induction involves the colonization of the root surface, followed by the elicitation of changes in the plant that lead to nodule primordium formation and to the entry of bacteria into the root. Like in legume-rhizobia symbioses, bacteria can enter the plant root either intracellularly through a curled root hair, or intercellularly without root hair involvement, and the entry mechanism is determined by the host plant species. Mature actinorhizal nodules are coralloid structures consisting of multiple nodule lobes each of which represents a modified lateral root without root cap, a superficial periderm and infected cells in the expanded cortex. In this review, an overview over infection mechanisms and nodule structure is given; comparisons with the corresponding mechanisms in legume-symbioses are presented. Recent results on the perception of bacterial signal factors are described.

Place, publisher, year, edition, pages
Münster, Germany: Springer , 2009. 127-154 p.
, Microbiology Monographs, ISSN 1862-5576 ; 8
URN: urn:nbn:se:su:diva-35060ISBN: 978-3-540-75459-6OAI: diva2:286298
Available from: 2010-01-14 Created: 2010-01-14

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