Dissecting Genetic Networks Underlying Wheat Kernel Characteristics in an Elite × Non-Adapted Cross Using 90k SNP Iselect Assay

Wheat (Triticum aestivum L.) kernel shape and size are key determinant of grain yield, milling characteristics and thus, the market values. Focusing on wheat kernel characteristics might be a key element to improve wheat genotypes for agronomic and quality traits. However, a detailed knowledge of the molecular basis of kernel shape characteristics and their association with quality and yield in common wheat is still missing. In this study, a population of 169 RILs developed using two contrasting genotypes (ND 705 and PI 414566) was evaluated at multiple locations for kernel traits including kernel length, width, length/width ratio, weight and area, agronomic and quality traits. Phenotypic analyses indicate that kernel traits can play a significant role in improving agronomic and quality traits. Higher values for grain yield, kernel volume weight, and flour extraction were significantly associated with spheroid or round shape (short and plump), large, and heavy kernels. The mapping population was genotyped using Infinium iSelect Assay containing about 90 SNPs. The results of dissection of genetic networks responsible for kernel shape and their association with milling and yield will be reported in this presentation. The study will provide useful molecular data for application in wheat breeding programs.