Table IV.
Disease severity in ethylene-insensitive mutants in response to virulent P. syringae pv glycinea and to an isogenic avirulent strain that expresses avirulence gene avrRpt2
| Soybean Line | Virulent
Strain
|
Avirulent Strain
(avrRpt2+)
|
||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 2 | 3 | 4 | 5 | 1 | 2 | 3 | 4 | 5 | |
| Hobbit 87 | 4.7 | – | 3.5 | 3.4 | 4.8 | 2.1 | – | 1.5 | 2.6 | 2.5 |
| etr1-1 | 4.5 | – | 3.1 | 3.7 | 4.8 | 1.4a,b | – | 1.4 | 1.9c,b | 2.6 |
| T123N37 | – | – | – | – | 4.7 | – | – | – | – | 2.3 |
| T124N38 | – | – | – | – | 5.0 | – | – | – | – | 2.5 |
| A90-312022 | 4.8 | 4.1 | 4.1 | 3.6 | 4.9 | 2.1 | 2.0 | 1.3 | 2.4 | 2.0 |
| etr2-1 | 4.1a,b | 4.1 | 3.2a,b | 3.7 | 4.9 | 2.4c,d | 1.8 | 1.3 | 3.1e,d | 1.7a,b |
| T58N5 | – | – | – | – | 5.0 | – | – | – | – | 4.2a,d |
Data are from five separate tests; test number is indicated at top of the column. Data presented are mean disease severity scores for unifoliate leaves, rated on a scale ranging from 0 (no lesions) to 5 (leaves completely necrotic); –, not tested. Note that test 5 used a different rating scale based on necrosis and chlorosis (see text). Statistical comparisons are between the mutant and its respective parent, Hobbit 87 or A90-312022.
Significant at P < 0.01.
Disease symptoms less severe than parent.
Significant at P < 0.10.
Disease symptoms more severe than parent.
Significant at P < 0.05.