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 recurrent selection for general combining ability?
Recurrent selection for general combining ability was proposed by Jenkins 1935. The progenies are crossed with tester strain with a broad genetic base. So plants are selected on the basis of superior performance of their plant X tester progenies would have superior GCA.
Who coined the term recurrent selection?
Hull
Recurrent Selection: The initial idea of recurrent selection was independently given by Hayes and Garber in 1919 and East and Jones in 1920. But the term recurrent selection was first coined by Hull in 1945. 2) The effectiveness of selection during the inbreeding of desirable genes.
What is reciprocal recurrent selection?
Reciprocal recurrent selection (RRS) is a cyclical breeding procedure designed to improve the cross of two populations from different heterotic groups by using both general and specific combining ability.
What is recurrent selection?
Recurrent selection means repeated cycles of selection and breeding aimed at gradual genetic improvement of a few key traits in a single species. The benefits of breeding are cumulative in that each cycle or generation of improvement builds upon advances made in prior generations.
What is full sib family selection?
Full sib family selection. Fullsibs are those which are produced by mating between selected plants in pairs. Here the progenies will have a common ancestry. The crossed progenies are tested.
What is recurrent parent?
Recurrent Parent means the parent to which successive BACKCROSSES are made in BACKCROSS breeding.
How do you calculate GCA and SCA?
SE of GCA for lines = (MSE/r x t)1/2; SE of GCA for testers = (MSE/r x l)1/2; SE of SCA effects = (MSE/r)1/2; where MSE = mean square error from the analysis of variance table. A tester is a genotype that is used to identify superior germplasm in accordance with breeding objectives in a hybrid-oriented program.
What is recurrent and non recurrent parent?
The variety which receives gene is ‘recipient parent’ and variety which is the source of gene is called as ‘donor parent’. Recipient parent is used repeatedly hence also named as ‘recurrent parent’. Donor parent is used only once and hence known as ‘non-recurrent parent’.
What is difference between 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 …
How do you calculate GCA?