TABLE 4.
Nodule invasion phenotype of S. meliloti exopolysaccharide mutants on modified Jensen's media
| Strain | No. of plants with pink nodulesa at:
|
||
|---|---|---|---|
| 0.1 mM phosphate | 8.5 mM phosphate | 25 mM phosphate | |
| Rm1021 | 30 | 30 | 30 |
| exoY | 0 | 0 | 0 |
| expA | 30 | 30 | 30 |
| exoY expA | 0 | 0 | 0 |
| expR101 | 30 | 30 | 30 |
| expR101 exoY | 30 | 30 | 10b |
a
Plants without pink nodules developed white nodules characteristic of inoculation of M. sativa with an exo mutant.
b
The plants had an average of 1.6 pink nodules per plant versus 9.1 pink nodules per plant for those inoculated with expR101 in high-phosphate media.