What is reciprocal recurrent selection in plant breeding?
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 are the different types of recurrent selection?
Many versions of recurrent selection have been developed: S0, S1, S2, full-sib, half-sib, ear-to-row, reciprocal recurrent, and reciprocal full-sib recurrent selection. These methods differ in the progeny that are evaluated in replicated field trials and in the progeny that are recombined to form the next cycle.
What is recurrent selection method?
Recurrent selection is a method which involves reselection generation after generation with interbreeding of selects to provide for genetic recombination. Thus it is a cyclic selection that is used to improve the frequency of desirable alleles for a character in a breeding population.
What kind of tester is used in reciprocal recurrent selection?
15. Reciprocal Recurrent Selection (RRS): A form of recurrent selection used to improve both GCA and SCA of a population for a character using two heterozygous testers is known as RRS. It is also known as recurrent reciprocal half sib 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.
What do you mean by recurrent and no recurrent parent?
• What is Recurrent Parent and Non- recurrent Parent? In backcross breeding, the parent from which few or more genes are transferred to the recurrent parent is called the Donor parent. In backcross breeding, the parent to which few or more genes are transferred from the donor parent is called the Recurrent parent.
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.
Why is recurrent selection a more efficient breeding method in cross pollinated crops than self pollinated explain?
Recurrent selection is efficient breeding method for increasing the frequency of superior genes in a population. It helps in maintaining high genetic variability in a population due to repeated intermating of heterozygous population.
What is recurrent parent?
Recurrent Parent means the parent to which successive BACKCROSSES are made in BACKCROSS breeding.
Why is recurrent selection a more efficient breeding method in cross pollinated crops than self-pollinated explain?
Which breeding method is not employed in cross-pollinated crops?
(i) Standard selfing method: Many lines are so poor in seed yield, pollen production, etc., that they cannot be used in a programme to produce single cross hybrid seed.
Which is the oldest breeding method?
Selection also called the German method is the oldest plant breeding method.
What is reciprocal selection in agriculture?
RECIPROCAL RECURRENT SELECTION It is a system of selection for increasing the combining ability of two or more lines or breeds that nick or combine well. In farm animals, selection is usually carried out for more than one trait, since one trait may be affected mostly by non-additive gene action and another by additive gene action or both.
What is reccurent selection?
This method was proposed by Comstock, Robinson and Harvey 1949. To improve two different populations in their combining ability simultaneously whentwo populations A and B, are involved in reccurent selection. A serve as a tester for the population B, and B serves as a tester for the plants selected from A.
Who proposed reccurent selection method?
This method was proposed by Comstock, Robinson and Harvey 1949. To improve two different populations in their combining ability simultaneously whentwo populations A and B, are involved in reccurent selection.
Why are a and B populations involved in reccurent selection?
To improve two different populations in their combining ability simultaneously whentwo populations A and B, are involved in reccurent selection. A serve as a tester for the population B, and B serves as a tester for the plants selected from A. A and B population has broad genetic base and genetically heterogenous.