What is recurrent selection?
Recurrent selection is a variation of backcross breeding, where selection for performance is practiced within consecutive segregating progeny generations after the population has undergone selection for the major trait being transferred (Green et al., 2008).
What are the steps of marker assisted selection?
There are three basic steps in the MABC technique viz. foreground selection, recombinant selection, and background selection. Foreground selection is the first step of MABC, where the gene of interest from the donor parent is the primary target which is linked with the marker.
What are the types of recurrent selection?
Types of Recurrent Selection:
- Simple Recurrent Selection: A type of recurrent selection that does not include tester is referred to as simple recurrent selection.
- Recurrent Selection for GCA:
- Recurrent Selection for SCA:
- Reciprocal Recurrent Selection:
What is the meaning of marker assisted selection?
Marker-assisted selection (MAS) is the process of using morphological, biochemical, or DNA markers as indirect selection criteria for selecting agriculturally important traits in crop breeding. This process is used to improve the effectiveness or efficiency of selection for the traits of interest in breeding programs.
Why is marker assisted selection important?
MAS can theoretically enhance selection efficiency because: It can be performed on seedling material, thus reducing the time required before a plant’s genotype is known. In contrast, many important plant traits are observable only when the plant has reached flowering or harvest maturity.
What is recurrent selection Slideshare?
Merits These recurrent selection schemes are useful for improving desirable genes in population It is useful in maintain high genetic variability in population due to repeated inter mating of heterozygous lines They can be used for developing synthetic varieties Isolation of inbred lines from improved …
What is GCA and SCA?
General combining ability (GCA) is directly related to the breeding value of a parent and is associated with additive genetic effects, while specific combining ability (SCA) is the relative performance of a cross that is associated with non-additive gene action, predominantly contributed by dominance, epistasis, or …
Who discovered recurrent selection?
The concept of reciprocal recurrent selection (RRS) was originally proposed by Comstock et al. (1949) and optimizes the use of general and specific combining ability by selecting genotypes from one population based on the performance of their progeny resulting from crosses with another population.
When was marker assisted selection first used?
1922
The method was first described in 1922 and was widely used between the 1930s and 1960s (Stoskopf et al. 1993). The use of DNA markers in backcrossing greatly increases the efficiency of selection. Three general levels of marker-assisted backcrossing (MAB) can be described (Holland 2004; figure 3).
Who gave recurrent selection?
It was HULL (1945) who first used the term “recurrent selection.” He proposed a breeding method which was termed “recurrent selection for specific combining ability.” The source material for this breeding plan consists of a heterozygous or heterogeneous population (recurrent parent) and an inbred tester.