Figure 1.

Symbiotic phenotypes of the ign1 mutant. Plants were inoculated with M. loti MAFF303099 and grown in vermiculite pots supplied with nitrogen-free medium in an artificially lit growth cabinet. A, Wild-type Gifu (left) and ign1 (right) 18 d after M. loti inoculation. B and C, Root nodules of wild type (B) and of ign1 (C). Bars represent 10 mm in A and 2 mm in B and C. D and E, Shoot growth and acetylene reduction activity, respectively, in the wild-type and ign1 plants after inoculation with M. loti. The data are represented as means of 12 plants with sds indicated by vertical bars.