“…(Cervantes et al, 1988, Miguel et al, 1978RodriguezBarrueco and Miguel, 1979). Moreover, it was shown earlier that a filtered nodule extract from C. myrtifolia was required to achieve effective nodulation by Alnus glutinosa crushed nodule suspensions and Frankia pure cultures (LDAgplrl, LDAgnl) obtained from this actinorhizal species (Cervantes et al, 1988;Rodriguez-Barrueco et al, 1988).…”