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#recurrent selection

3 public questions tagged with this topic.

Plant Breeding 3

Progeny testing is essential in recurrent selection because:

Phenotype of a single cross-pollinated plant poorly reflects its transmitting ability because heterozygosity, dominance, and micro-environment mask genotype. Superior appearance may result from favorable interlocus interactions or non-heritable environmental boost, not additive alleles that can be passed to progeny. Progeny testing evaluates half-sib or S1 families derived from selected plant in replicated trials, providing estimate of breeding value, general combining ability, and heritability. In recurrent selection, selected S1 plants are selfed and testcrossed to a common tester; progeny m

Ref: Lush JL. Animal Breeding Plans; Acquaah Chapter 13 – importance of progeny testing in recurrent selection

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Plant Breeding 3

The objective of recurrent selection is to:

Recurrent selection functions as a population improvement strategy aimed at slowly accumulating favorable alleles at multiple loci controlling polygenic traits. Each cycle selects individuals or families with superior phenotypic value or good combining ability, then recombines them to break repulsion linkages and generate new genotypic arrays. Over cycles, frequency of positive additive alleles rises, additive genetic variance converts to breeding value, and mean performance of population for traits like grain yield, kernel weight, and stress tolerance increases. Unlike pedigree breeding which

Ref: Comstock RE et al. 1949 Genetics – recurrent selection theory. Hallauer Quantitative Genetics

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Plant Breeding 3

Recurrent selection is mainly practiced in:

Recurrent selection was conceptualized by Hayes and Garber for improving cross-pollinated populations where individuals are heterozygous and open-pollinated progeny expose combining ability and additive effects. In maize, brassicas, and alfalfa, gamete pool is shared through random mating, allowing allele frequencies to be altered gradually without immediate fixation. Recurrent cycles involve selection of superior individuals based on phenotype or testcross performance, intercrossing selected individuals in isolation to form new population for next cycle, increasing frequency of favorable addi

Ref: Hallauer AR & Darrah LL. Recurrent selection in maize; Sprague GF. Iowa St. J. Sci.

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