low genetic diversity among frankia spp. strains nodulating sympatric populations of actinorhizal species of rosaceae, ceanothus (rhamnaceae) and datisca glomerata (datiscaceae) west of the sierra nevada (california). | frankia spp. strains typically induce n2-fixing root nodules on actinorhizal plants. the majority of host plant taxa associated with the uncultured group 1 frankia strains, i.e., ceanothus of the rhamnaceae, datisca glomerata (datiscaceae), and all actinorhizal members of the rosaceae except dryas, are found in california. a study was conducted to determine the distribution of frankia strains among root nodules collected from both sympatric and solitary stands of hosts. three dna regions were ex ... | 2004 | 15714229 |