Table 5. Significant QTL and the percentage of genetic variance explained by the full QTL model for photosynthate acquisition, accumulation, and partitioning traits in the DOR364 × BAT477 mapping population grown under drought stress and nonstress conditions at four different locations in three countries (Colombia, Ethiopia, and Malawi) using multienvironment mixed model genome scan.
| % of Genetic Varianceb | ||||||||
|---|---|---|---|---|---|---|---|---|
| Trait | QTLa | LG | Marker | LOD | Wald | Prwald | Stress | Nonstress |
| Yield | Yld8.1 | 8 | P103 | 2.83 | 3.03 | 0.003 | 19.45 | 14.45 |
| Canopy biomass | Cbm3.1 | 3 | AD1801 | 4.14 | 3.37 | 0.011 | 0.70 | 5.35 |
| Pod harvest index | Phi6.1 | 6 | Y501 | 3.30 | 4.92 | 0.001 | 0.00 | 6.45 |
| Pod partitioning index | Ppi3.1 | 3 | Q1701 | 3.14 | 3.28 | 0.013 | 0.95 | 10.00 |
| Stem biomass reduction | Sbr9.1 | 9 | Y1701 | 2.88 | 8.42 | 0.004 | 2.15 | 4.20 |
| Harvest index | Hri3.1 | 3 | Q1701 | 2.85 | 3.03 | 0.019 | 0.65 | 4.55 |
| Stem TNC | Stc5.1 | 5 | F601 | 4.77 | 11.72 | 0.000 | 1.20 | 17.60 |
| Stc6.1 | 6 | M501 | 3.68 | 17.35 | 0.000 | 11.60 | 3.60 | |
| SPAD chlorophyll meter reading | Scr6.1 | 6 | BMc238 | 10.79 | 11.39 | 0.000 | 19.68 | 42.23 |
| Leaf area index | Lai10.1 | 10 | N601 | 2.76 | 11.52 | 0.001 | 0.00 | 3.40 |
QTL, quantitative trait loci; LG, linkage group; LOD, log of odds; Prwald = Wald probability; TNC, total nonstructural carbohydrate content; SPAD, XXX.
QTL name based on association with yield (Yld), canopy biomass (Cbm), pod harvest index (Phi), Pod partitioning index (Ppi), stem biomass reduction (Sbr), harvest index (Hri), stem total nonstructural carbohydrate (Stc), SPAD chlorophyll meter reading (Scr), and leaf area index (Lai). Numbers indicate chromosome association (first number) and order of identification (second number after decimal point).
The percentage of variance explained for each QTL under the full QTL model drought stress and nonstress conditions was calculated as average across the sites for the trait in respective drought stress and nonstress environments.