Estimates of Epistasis for Diverse Peanut Cultivars1,2

Isleib, T. G.; Wynne, J. C.; Rawlings, John O.

doi:10.3146/i0095-3679-5-2-12

Cited by 12 publications

(7 citation statements)

References 4 publications

(6 reference statements)

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“…There is some evidence for this. In peanut, Isleib et al (1978) found significant variation for yield and yield components in the F 4 and F 5 generations of a six line half‐diallel experiment that was due to specific combining ability. They interpreted this to be due to additive × additive epistasis.…”

Section: Discussionmentioning

confidence: 93%

Heterosis and Inbreeding Depression in Two Soybean Single Crosses

Burton

Brownie

2006

Crop Science

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Heterosis is considered to be of little importance in soybean (Glycine max L. Merr.) because the crop is produced as "pure-line" cultivars or blends of inbred lines. The F 1 generations Holladay/ Hutcheson (Cross 1) and Brim/Boggs (Cross 2) were generated by hand pollinations. Inbred generations were generated by bulk selfing. The F 1 , F 2 , F 3 , F 4 , and F 5 generations were yield-tested in replicated bordered single row plots in multiple years and locations. The average yield of Cross 1 F 1 was 16% greater than that of the highest-yielding parent and the average yield of the Cross 2 F 1 was 5% greater than the highest-yielding parent. Cross 1 showed significant inbreeding depression when regressed on percentage inbreeding which is clear evidence of dominance for yield. Possible genetic bases for heterosis in soybean include gene complementation or interaction of duplicate favorable loci in repulsion, linked dominant alleles that are inherited as a unit, a greater number of dominant alleles in the F 1 than either parent separately, multiple dosage-dependant regulatory loci, and/or overdominance. The existence of heterosis should be evidence that superior gene combinations are possible. The magnitude of yield heterosis may be a useful criterion for selection among biparental crosses.

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Section: Discussionmentioning

confidence: 93%

Heterosis and Inbreeding Depression in Two Soybean Single Crosses

Burton

Brownie

2006

Crop Science

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“…ISLEIB et al (1978) found significant estimates of epistatic variance for some traits in populations derived from crosses of diverse peanut lines. Linkage of partially or completely dominant genes and additive types of epistasis are probably the best explanations for the observed heterosis.…”

Section: Resultsmentioning

confidence: 99%

Combining ability for yield, protein and oil of peanut lines from South American centers of diversity

1980

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“…As a result, high selection pressure would have been applied on favorable alleles over the generations resulting in LD between non-syntenic loci pairs. Epistatic selection is also reported in peanut, between genes controlling some vital traits in segregating populations (Isleib et al 1978;Layrisse et al 1980;Isleib and Wynne 1983). Hence, selection might be one of the factors inducing LD between unlinked loci pairs in the peanut genome.…”

Section: Discussionmentioning

confidence: 99%

A first insight into population structure and linkage disequilibrium in the US peanut minicore collection

et al. 2011

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Knowledge of genetic diversity, population structure, and degree of linkage disequilibrium (LD) in target association mapping populations is of great importance and is a prerequisite for LD-based mapping. In the present study, 96 genotypes comprising 92 accessions of the US peanut minicore collection, a component line of the tetraploid variety Florunner, diploid progenitors A. duranensis (AA) and A. ipae¨nsis (BB), and synthetic amphidiploid accession TxAG-6 were investigated with 392 simple sequence repeat (SSR) marker bands amplified using 32 highly-polymorphic SSR primer pairs. Both distance-and model-based (Bayesian) cluster analysis revealed the presence of structured diversity. In general, the wild-species accessions and the synthetic amphidiploid grouped separately from most minicore accessions except for COC155, and were eliminated from most subsequent analyses. UPGMA analysis divided the population into four subgroups, two major subgroups representing subspecies fastigiata and hypogaea, a third group containing individuals from each subspecies or possibly of mixed ancestry, and a fourth group, either consisting of COC155 alone if wild species were excluded, or of COC155, the diploid species, and the synthetic amphidiploid. Modelbased clustering identified four subgroups-one each for fastigiata and hypogaea subspecies, a third consisting of individuals of both subspecies or of mixed ancestry predominantly from Africa or Asia, and a fourth group, consisting of individuals predominantly of var fastigiata, peruviana, and aequatoriana accessions from South America, including COC155. Analysis of molecular variance (AMOVA) revealed statistically-significant (P \ 0.0001) genetic variance of 16.87% among subgroups. A total of 4.85% of SSR marker pairs revealed significant LD (at r 2 C 0.1). Of the syntenic marker pairs separated by distances \ 10 cM, 11-20 cM, 21-50 cM, and [ 50 cM, 19.33, 5.19, 6.25 and 5.29% of marker pairs were found in strong LD (P B 0.01), in accord with LD extending to great distances in self pollinated crops. A threshold value of r 2 [ 0.035 was found to distinguish mean r 2 values of linkage distance groups statistically from the mean r 2 values of unlinked markers; LD was found to extend to 10 cM over the entire minicore collection by this criterion. However, there were large differences in r 2 values among marker pairs even among tightly-linked markers. The implications of these findings with regard to the possibility of using Vikas Belamkar-This work was performed in partial fulfillment of the requirements for the Master of Science degree.

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Estimates of Epistasis for Diverse Peanut Cultivars1,2

Cited by 12 publications

References 4 publications

Heterosis and Inbreeding Depression in Two Soybean Single Crosses

Heterosis and Inbreeding Depression in Two Soybean Single Crosses

Combining ability for yield, protein and oil of peanut lines from South American centers of diversity

A first insight into population structure and linkage disequilibrium in the US peanut minicore collection

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