| Authors: | Alcivar, A., Jacobsen, J., Rainho, J., Meksem, K., Lightfoot, D., Kassem, M. |
| Abstract: | Diseases, mineral deficiencies, and water defecit reduce plant height and yield in many crop species. Conversely, plant growth regulators, water sufficiency and some diseases can increase plant height cause plants to lodge and may reduce yield. The aims of this study were to identify quantitative trait loci (QTL) for plant height (PLH), internode lengths (INL), and hypocotyls length (HYL) traits in soybean using the ïEssexÍ by ïForrestÍ recombinant inbred line (RIL) population. Seedlings were grown in the greenhouse in replicated experiments. A total of 21 QTL for the 3 traits were located on 9 different linkage groups (LG). Sixteen QTL for INL (qINL1-16) were identified on LG A2, B1, C1, C2, D1b+W, D2, F, G, and K. LOD scores ranged from 2.64 to 4.5 and R2 from 45.22 to 70.64 %. Three QTL for PLH (qPLH1-3) were identified on LG C2 and F. Their LOD scores ranged of 2.65 to 2.99 with R2 ranging from 41.43 to 45.80 %. Two QTL for HYL (qHYL1-2) were identified on LG F with peak LOD scores of 2.51 and 2.85, and R2 of 39.54 and 39.21 %, respectively. The traits studied here are components of yield and the QTL presented are important in soybean breeding programs to produce high yielding cultivars and germplasm. |