TABLE 2.
List of traits evaluated under greenhouse conditions in the CSSL donors and recurrent parents.
| Trait name | ORSCa donor accessions | O. sativa recurrent accessions | |||
| OrA | OrB | OrC | Cybonnet | IR64 | |
| Culm angle | Erect (5–10°) | Spreading (>60–80°) | Open (∼60°) | Erect (4–8°) | Erect (12–17°) |
| Awn presence* | 9, Long and fully awned | 9, Long and fully awned | 9, Long and fully awned | 0, Absent | 0, Absent |
| Panicle type* | 1, Compact | 3, Open | 3, Open | 1, Compact | 2, Intermediate |
| Rhizome/stolon formation* | 1, Vegetative crown | 3, Vegetative crown and weak rhizomes | 3, Vegetative crown and weak rhizomes | 1, Vegetative crown | 1, Vegetative crown |
| Elbows* | 1, Absent | 2, Present | 2, Present | 1, Absent | 1, Absent |
| Plant height | avg. 197 cm | avg. 89.1 cm | avg. 99 cm | avg. 116 cm | avg. 98 cm |
| Days to flowering in Ithaca, NY (∼15 h daylength) | avg. 89 days | avg. 110 days | avg. 135 days | avg. 85 days | avg. 94 days |
| Seed production | Moderate | Moderate | Low | High | High |
| Seed shattering or hilum abscission* | 0 | 9 (>50%) | 9 (>50%) | 0 | 0 |
| Lemma and Palea: Hull color* | 8, Black | 8, Black | 8, Black | 2, Straw | 3, Gold |
| Caryopsis: Grain color* | 5, Brown | 5, Red | 5, Red | 2, Light brown | 2, Light brown |
| Hull length or grain length (mm) | 8.3 | 7.3 | 8.4 | 9.3 | 9.8 |
| Hull width or grain width (mm) | 2.6 | 2.3 | 2 | 2.5 | 2.7 |
| Grain length or caryopsis length (mm) | 6.4 | 5.4 | 5.9 | 7.1 | 7.2 |
| Grain width or caryopsis width (mm) | 2.1 | 1.9 | 1.7 | 2.1 | 2.2 |
| Phenol reactionb | 1, Positive | 1, Positive | 1, Positive | 0, Negative | 1, Positive |
*Numbers refer to the Standard Evaluation System (SES) for rice; see also Supplementary Table S1 for descriptions.
aOryza rufipogon Species Complex (ORSC).
bDetermined using the method of Chen et al. (2014).