Selection response under random mating and under selfing in the progeny of a cross of homozygous parents

Stam, P.

doi:10.1007/bf00032082

Cited by 15 publications

(9 citation statements)

References 6 publications

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“…Most theoretical research suggests that random mating for more than a single generation provides little benefit for the time and resources required (Pederson 1974;Bos 1977;Stam 1977). emphasized that in addition to enhancing genetic variation, random mating may have the undesirable effect of disrupting linkage blocks which maintain favorable epistatic interactions.…”

Section: Selectionmentioning

confidence: 99%

Linkage disequilibrium in maize F2 populations

Cook

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CHAPTER 1. GENERAL INTRODUCnON 1 Introductioa 1 Dissertation Organization. 2 CHAPTER 2. LITERATURE REVIEW 4 Linkage Disequilibiium in F2 Populations 4 North Carolina Design HI Analysis 4 Average level of dominance 5 Assumptions of the Design lU. 6 Effects of Linkage Disequilibrium on Genetic Parameters of Populations 7 Genetic variances 7 Heterosis and the average level of dominance 7 Heritability 8 Selection 9 Covariance of traits 9 Experimental Results 10 Conclusions 14 References 15 CHAPTER 3. TEN GENERATIONS OF RANDOM MATING IN A B73 x M017 MAIZE F2 POPULATION

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Section: Selectionmentioning

confidence: 99%

Linkage disequilibrium in maize F2 populations

Cook

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“…Further, the significance of intensive (spontaneous) mating in the F 2 and the F 3 for recombination is negligeable (Bos, 1977 ;STAM, 1977) . We can but conclude that male sterility will be of little use when intermating varieties of self-fertilizing crops .…”

Section: Could Male Sterility Be a Help?mentioning

confidence: 99%

Selection for yield in early generations of self-fertilizing crops

Sneep

1977

Euphytica

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“…Pedigree breeding is the most commonly used method for developing improved cultivars in dolichos bean (Ramesh and Byregowda, 2016), as is practiced in other legumes and inbreeding species. However, pedigree method of breeding enable exploiting only fixable genetic effects as a result of rapid increase in homozygosis (Clegg et al, 1972), which further limits opportunities for recombination retaining and/or favoring accumulation of haplotypes harboring genes controlling desirable and undesirable traits (Hanson, 1959;Pederson, 1974;Bos, 1977;Stam, 1977). One or a few cycles of inter-mating in F 2 generation results in break-up of linkage blocks and help create populations with high frequency of desired recombinants which otherwise cannot be realized in later generations (Hanson, 1959;Bos, 1977;Stam, 1977;Yunus and Paroda, 1983).…”

Section: Introductionmentioning

confidence: 99%

Effect of F2 Inter se Mating on Quantitative Traits Mean, Range, Variance and Heritability in Dolichos Bean (Lablab purpureus L. Sweet var. Lignosus)

Chandrakant¹,

Ramesh²,

Vaijayanthi³

et al. 2021

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Background: Pedigree method of breeding in predominantly self-pollinated crop like dolichos bean enable exploiting only fixable genetic effects as a result of rapid increase in homozygosis. One or a few cycles of inter-mating in F2 generation help create populations with high frequency of desired recombinants which otherwise cannot be realized in later generations. The objective of the present investigation was to assess the impact of inter se mating in F2 population on nine quantitative traits’ (QTs) mean and variability parameters.Methods: Randomly selected 20 pairs of a single cross-derived F2 plants with flowering synchrony were inter se mated. Progenies derived from 20 paired crosses (designated as BIP F3 progenies) and those (F3) derived from their 40 F2 parents were evaluated for 9 QTs. Statistics such as mean, absolute range (AR) and standardized range (SR), variance (σ2), additive genetic variance (σ2A) and narrow-sense heritability (NS-h2) were estimated. BIP F3 progenies were compared with those of F3 progenies for QTs mean, AR/SR, σ2, σ2A and NS-h2. Significance of differences between BIP F3 progenies and F3 progenies for mean and σ2 were examined using two-sample t test and Levene’s tests, respectively. Result: The random mating in F2 population was effective in increasing the means, variances, σ2A and NS-h2 of racemes plant-1, fresh pods node-1, fresh pods plant-1 and fresh pod yield plant-1 in dolichos bean. Considering that random mating followed by selfing is a method of genetic improvement for future breeding rather than for immediate use, our results suggest long-term genetic gain and better prospects of deriving superior pure-lines with desired traits/combination of traits from inter-mated population in dolichos bean.

show abstract

Selection response under random mating and under selfing in the progeny of a cross of homozygous parents

Cited by 15 publications

References 6 publications

Linkage disequilibrium in maize F2 populations

Linkage disequilibrium in maize F2 populations

Selection for yield in early generations of self-fertilizing crops

Effect of F2 Inter se Mating on Quantitative Traits Mean, Range, Variance and Heritability in Dolichos Bean (Lablab purpureus L. Sweet var. Lignosus)

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