Table 6.
Description of the spike characteristics used for morphometry. The characteristic abbreviations, names and units are given. See also Figure 7b.
| Trait No. | Abbreviation | Name | Measurement Units |
|---|---|---|---|
| Manually estimated parameters | |||
| 1 | SL | Spike length | mm |
| 2 | SFW | Front width | mm |
| 3 | SSW | Side width | mm |
| 4 | SSC | Spikelet number | dimensionless |
| 5 | SDI | Density index | dm−1 |
| Independent parameters for the quadrangle model | |||
| 6 | q_x1s | Length of the basal spike segment | mm |
| 7 | q_x2s | Length of the central spike segment | mm |
| 8 | q_x3s | Length of the apical spike segment | mm |
| 9 | q_y1s | Width of the basal segment | mm |
| 10 | q_y2s | Width of the apical segment | mm |
| Derived parameters for the quadrangle model | |||
| 11 | q_L | Spike length (q_x1s + q_x2s + q_x3s) | mm |
| 12 | q_S1 | Area of the basal spike segment | mm2 |
| 13 | q_S2 | Area of the central spike segment | mm2 |
| 14 | q_S3 | Area of the apical spike segment | mm2 |
| 15 | q_S | Area of the quadrangle for half a spike | mm2 |
| 16 | q_ym | Width index (q_S/q_L) | mm |
| 17 | q_x1ns | Normalized length of the basal spike segment (q_x1s/q_L) | dimensionless |
| 18 | q_x2ns | Normalized length of the central spike segment (q_x2s/q_L) | dimensionless |
| 19 | q_x3ns | Normalized length of the apical spike segment (q_x3s/q_L) | dimensionless |
| 20 | q_y1ns | Normalized width of the basal spike segment (q_y1s/q_L) | dimensionless |
| 21 | q_y2ns | Normalized width of the apical spike segment (q_y2s/q_L) | dimensionless |
| 22 | q_S1S | Normalized area of the basal spike segment (q_S1/q_S) | dimensionless |
| 23 | q_S2S | Normalized area of the central spike segment (q_S2/q_S) | dimensionless |
| 24 | q_S3S | Normalized area of the apical spike segment (q_S3/q_S) | dimensionless |
| General size and shape parameters for the spike contour | |||
| 25 | c_P | Perimeter | mm |
| 26 | c_SA | Spike body projection area | mm2 |
| 27 | c_AA | Awn area | mm2 |
| 28 | c_Ci | Circularity | dimensionless |
| 29 | c_R | Roundness | dimensionless |
| 30 | c_So | Solidity | dimensionless |
| 31 | c_Ru | Rugosity | dimensionless |