Table 2. Summary of QTL analyses in V. riparia × ‘Seyval’ F2 family.
| Trait | No. of individuals phenotyped | Linkage Group (LG) | Peak position (cM) a | Physical position of the nearest marker | LOD score | LOD interval (cM) b | LOD interval (physical location) | Additive effect c | Dominant effect | R2 d |
|---|---|---|---|---|---|---|---|---|---|---|
| Berry skin color | 65 | 2 | 85.40 | 9,126,568 | 12.47 | 71.06–90.85 | 6,360,259–14,300,736 | -0.50 | 0.47 | 89.92 |
| Yeast assimilable nitrogen (YAN, mg/L) | 63 | 7 | 100.44 | 18,819,915 | 6.48 | 94.87–106.85 | 16,987,038–20,565,550 | -52.55 | -38.91 | 22.81 |
| Malic acid concentration (MA, g/L) | 63 | 6 | 70.24 | 7,985,435 | 6.24 | 62.95–75.23 | 7,343,698–8,358,059 | 2.50 | 1.26 | 26.19 |
| Total soluble solids content (SS, %w/w) | 63 | 6 | 46.18 | 5,498,696 | 4.76 | 35.85–54.71 | 4,258,443–6,497,323 | -2.16 | 0.0811 | 19.14 |
| MA/SS ratio | 63 | 6 | 32.10 | 3,857,140 | 5.93 | 27.07–35.85 | 3,524,817–4,258,443 | 0.17 | 0.00262 | 26.04 |
| Joint analysis of MA and SS | 63 | 1 | 49.94 | 5,061,702 | 6.55 | 49.10–51.12 | 5,026,255–5,123,842 | MA -0.40 | 0.34 | 7.93 |
| SS -0.14 | 0.20 | 1.02 | ||||||||
| Joint analysis of MA and SS | 63 | 6 | 75.23 | 8,358,059 | 4.23 | 70.21–80.83 | 7,985,435–11,876,418 | MA 0.60 | 0.28 | 18.37 |
| SS 0.62 | -0.24 | 19.43 |
a Position of likelihood peak (highest LOD score).
b LOD interval refers to 1.8-LOD support interval, except for Berry skin color, for which a 1.5-LOD support interval was used.
c Additive effect: A positive value means the higher value of the trait due to allele from grandparent2, ‘Seyval’. A negative value means the higher value of the traits due to allele from grandparent1, V. riparia. The units depend on the traits.
d R2 (coefficient of determination): percentage of phenotypic variance explained by the QTL.