QTL Mapping in Plant Breeding
QTL Mapping QTL mapping is a statistical analysis to identify which molecular markers lead to a quantitative change of a particular trait . Principle of QTL Mapping Ø The objective behind QTL mapping is to find the association between genotypic and phenotypic data. The molecular markers are used to divide the mapping population into distinct genotypic classes depending on genotypes at the marker locus, and correlative statistics are used to see if individuals of one genotype vary substantially from those of the other genotype in terms of the characteristic under investigation. Ø A substantial variation in phenotypic averages between the two / more groups based on the marker system and population type suggests that the marker locus used to split the mapping population is related to a QTL regulating the trait. Ø Recombination is responsible for a large P-value reported for discrepancies between the marker and the QTL. The closer a marker is to a QTL, the less likely it ...