Table I.
Ethylene sensitivity of parental and mutant soybean lines
| Soybean Line | Phenotype | Genotype | Ethylene Response: Hypocotyl Lengtha |
|---|---|---|---|
| cm | |||
| Hobbit 87 | Wild type | Parent | 2.1 ± 0.3 |
| T119N54 | Ethylene insensitive | etr1-1 | 12.8 ± 1.1* |
| T124N38B | Intermediate/partial ethylene insensitive | ? | 8.9 ± 0.7* |
| A90-312022 | Wild type | Parent | 2.1 ± 0.4 |
| T15N23 | Weak ethylene insensitive | etr2-1 | 3.4 ± 0.6* |
| T58N5 | Weak ethylene insensitive | etr3? | 2.9 ± 0.3* |
| Bragg | Wild type | Parent | 1.7 ± 0.4 |
| nts382 | Hypernodulating | ? | 1.6 ± 0.3 |
| nts1116 | Hypernodulating | ? | 1.7 ± 0.4 |
| Enrei | Wild type | Parent | 2.0 ± 0.2 |
| En6500 | Hypernodulating | rj7 | 2.2 ± 0.5 |
| Harosoy | Wild type | Parent | 1.7 ± 0.4 |
| Harosoy NN | Nonnodulating | rj1 | 1.6 ± 0.5 |
| Williams 82 | Wild type | Parent | 1.3 ± 0.2 |
| NOD1-3 | Hypernodulating | rj7 | 1.5 ± 0.3 |
| NOD2-4 | Hypernodulating | rj7 | 1.4 ± 0.2 |
| NOD3-7 | Hypernodulating | rj7 | 1.6 ± 0.2 |
| NN5 | Nonnodulating | rj5, rj6 | 1.4 ± 0.2 |
Etiolation response of seedlings germinated for 6 d in the dark in 20 μL L−1 ethylene; soybean seedlings germinated in the same assay system but in air typically form hypocotyls that are 12 to 15 cm in length (Hoffman, et al., 1999). Values marked with an asterisk are significantly different from those of the parental line according to the Student's t test (P < 0.05).
a
Values are means ± sd.