Abstract
Most of the information on the diversity of Frankia comes from strains isolated from plant species of numerous geographical sites, but primarily within North America and Western Europe (Ruan and Wang, 1991). There are few information about Frankia of native plant species in South America. Several strains have been isolated in Chile from rhamnaceous shrubs Colletia spp., Retanilla ephedra, Telquenea quinquinervis, Trevoa trinervis, Discaria trinervis and D. serratifolia (Longeri and Arbazua, 1989; Carrasco et al, 1991; Caru, 1993). These isolates have been characterised ultrastracturally in nodules and in vitro growth but there is no report on infectivity and effectivity of them on any actinorhizal plants. Discaria trinervis is a South American species which grows as woody deciduous trees or shrubs with actinorhizal root nodules (Tortosa, 1983). The aim of this work is to report the characterization of an infective and effective Frankia strain isolated from Discaria trinervis growing in Patagonia, Argentina.
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