Genetic Studies for Improved Agronomic Performance Under Abiotic and Biotic Stresses in Spring Wheat (Triticum Aestivum L.)
Author | : Jayfred Gaham Villegas Godoy |
Publisher | : |
Total Pages | : 229 |
Release | : 2016 |
ISBN-10 | : OCLC:1005671239 |
ISBN-13 | : |
Rating | : 4/5 (39 Downloads) |
Book excerpt: Wheat (Triticum aestivum L.) is the main source of food for roughly one-third of the world's population. In order to satisfy demand, wheat is planted over millions of acres and exposed to various abiotic and biotic stresses such as heat stress and stripe rust (Puccinia striiformis). Development of cultivars with improved agronomic performance and stable yields is necessary to prevent yield losses and possibly food shortage. A quantitative trait loci (QTL) mapping study was performed using a recombinant inbred population derived from a cross between elite spring wheat varieties 'Kelse' and 'Scarlet' to identify QTL associated with heat tolerance under natural and controlled conditions. Our analysis yielded 19 QTL linked to 14 traits related to heat tolerance. A pleiotropic region for yield components was detected on chromosome 4AL which can be a valuable resource of favorable alleles for heat tolerance. Genome-wide association analysis was conducted on a population of elite North American germplasm to detect significant marker-traits associations (MTAs) for resistance to stripe rust infection and improved grain yield and yield component traits. Eleven highly significant (FDR