Molecular biology of infection and nodule development in Discaria trinervis ? Frankia actinorhizal symbiosis.

IMANISHI L; GABBARINI L; CLAUDIO VALVERDE; CHAIA E; BOGUSZ D; FRANCHE C; WALL LG; SVISTOONOFF S

Biological Nitrogen Fixation

Wiley & Sons Inc.

Año: 2015; p. 434 - 440

To cope with nitrogen deficiency, some plants evolved the capacity to form nitrogen-fixing root nodules in association with soil bacteria. This ability is restricted to two groups of plants: legumes and Parasponia (Cannabaceae) that inter- act with Gram-negative Proteobacteria collectively called rhizobia, and actinorhizal plants, a group of 220 species of Fagales, Cucurbitales, or Rosales, that interact with Gram-positive actinomycetes of the genus Frankia (Vessey et al., 2005). All these plants are phylogenetically related and clustered together in the Fabid clade, which also con- tains numerous nonnodulating taxons. However, nodulation is not an ancestral trait, it probably appeared independently 12?16 times during the evolution of Fabids (Doyle, 2011). Fabids appear to have evolved a predisposition to develop nitrogen-fixing nodules, which is not found in any other group of plants. The genetic basis of this predisposition is not well understood...