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Nodules induced on M. sativa by addition of purified NFs at 10−8 M and 10−9 M. NFs were purified from the following strains. NodRm, R. meliloti RCR2011(pMH682); NodRt, R. tropici wild type; NodRt hyb, R. tropici (pGMI149)(pGMI1962); NodRt hybA−, R. tropici (pGMI149nodA)(pGMI1962). Nodules were scored 25 days after addition of the NFs. Ten tubes were used for each dilution, with two seedlings per tube. For details on the statistical analysis of nodule numbers, see the Fig. 3 legend.
