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  Rhizogenesis Lab

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................................    Rhizogenesis Lab - Introduction    ................................

(version française)

The Casuarinaceae family is a large group of perennial Angiosperms composed of four genera : Allocasuarina, Casuarina, Gymnostoma and Ceuthostoma. These plants have the ability to thrive under a range of environmental stresses and poor soils.

Casuarina


This is due to the outstanding plasticity of their root system. Roots from Casuarina can form nitrogen-fixing root nodules (actinorhizae) in symbiosis with the actinomycete Frankia. They also develop endo or  ectomycorrhizae that increase the mineral nutrition. In extremely poor soils, cluster roots (or proteoid roots) also appear. They have been shown to increase both iron and phosphorus intake by the plant. Myconodules have also been described in some Gymnostoma trees (Duhoux et al., New Phytol. 149: 115-125, 2001). Their function is unknown. All these specialised structures are modified lateral roots.


Root developmental plasticity

We are interested in understanding the molecular bases of the plasticity of development of the Casuarinaceae root system

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Equipe Rhizogenèse 2006 - Institut de Recherche pour le Développement
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