Emerging Paradigms in Genomics-Based Crop Improvement

Table 3

Basic differences among various marker based selection schemes.

	MABC	AB-QTL	MARS	GS
Test population	Mapping population (family-based)	Mapping population (family-based)	Mapping population (family-based)	Training Population (family-based/diverse germplasm)
Relies on	Linkage	Linkage	Linkage	Genome wide LD
QTL discovery and introgression	Two different populations	Same population	Same/two different populations	Two different populations
Historical phenotypic data	Not required	Not required	Not required	Required
Efficient in capturing	Few major QTLs	Exotic QTLs	Several minor QTLs	Genome wide QTLs
Statistical analysis	Simple	Simple	Relatively simple	Computationally challenging
Marker-trait establishment	Not performed	Performed	Not necessary	Not performed
A prior QTL information	Required	Not required	Not required (ad hoc index can be used)	Not required
Marker genotyping	Target markers only	Several markers	Several markers	Genome wide
Markers used for	Selection	Selection	Selection and intermating	GEBV calculations
Genetic gains (compared to PS)	Low	Moderate	Moderate to high	Highest