Epistasis and Plant Breeding

Holland, James B.

doi:10.1002/9780470650196.ch2

Cited by 125 publications

(81 citation statements)

References 168 publications

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“…In many ways, this is unsurprising, as epistasis has been earlier reported to have a function in phenotype expression (Avery and Wasserman, 1992). Epistasis has been proposed to have a significant function in some elite maize hybrids (Lamkey et al, 1995;Holland, 2001). Most epistatic interactions observed in this study resulted in a change in magnitude, but not direction of the effect of one QTL across homozygous genotypes at a second QTL (Tables 5-7).…”

Section: Discussionmentioning

confidence: 59%

Direct mapping of density response in a population of B73 × Mo17 recombinant inbred lines of maize (Zea Mays L.)

et al. 2009

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Maize yield per unit area has dramatically increased over time as have plant population densities, but the genetic basis for plant response to density is unknown as is its stability over environments. To elucidate the genetic basis of plant response to density in maize, we mapped QTL for plant density-related traits in a population of 186 recombinant inbred lines (RILs) derived from the cross of inbred lines B73 and Mo17. All RILs were evaluated for growth, development, and yield traits at moderate (50 000 plants per hectare) and high (100 000 plants per hectare) plant densities. The results show that genetic control of the traits evaluated is multigenic in their response to density. Five of the seven loci significant for final height showed statistical evidence for epistatic interactions. Other traits such as days to anthesis, anthesis-to-silking interval, barrenness, ears per plant, and yield per plant all showed statistical evidence for an epistatic interaction. Locus by density interactions are of critical importance for anthesis-to-silking interval, barrenness, and ears per plant. A second independent experiment to examine the stability of QTL for barrenness in a new environment clearly showed that the multilocus QTL were stable across environments in their differential response to density. In this verification experiment, the four-locus QTL was used to choose lines with the four unfavorable alleles and compare them with the lines with four favorable alleles and the effect was confirmed.

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Section: Discussionmentioning

confidence: 59%

Direct mapping of density response in a population of B73 × Mo17 recombinant inbred lines of maize (Zea Mays L.)

et al. 2009

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“…Previous studies have shown that the P content in seeds of common bean has a narrow-sense heritability ranging from a low (21.37%) to intermediate values (65.54%) (Rosa, 2009). For Ca content of common bean seeds, narrow-sense heritability estimates from intermediate (47%) to high (63.61%) values were of alleles at different loci, which can be erroneously detected as an additive variance by statistical methods (Holland, 2001). In the present study, transgressive segregation was observed, and plants with low-seed K content were obtained.…”

Section: Resultsmentioning

confidence: 65%

Genetic control of potassium content of common bean seeds

Poersch

Ribeiro

Rosa

et al. 2011

Pesq. agropec. bras.

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-The objective of this work was to investigate possible maternal effects on potassium content of common bean seeds, as well as to estimate the heritability and selection gains in early hybrid generations for this character and to evaluate the efficiency of genetic selection to improve the nutritional quality of common bean (Phaseolus vulgaris). Crosses with four cultivars from the Mesoamerican gene pool yielded the reciprocal F 1 and F 2 generations and the backcrossed populations (BCP 1 and BCP 2 ). The potassium content of the progenies was measured via nitric-perchloric digestion and flame photometry. The potassium content in the tested progenies varied from 6.0 to 14.9 g kg -1 dry matter, and no significant maternal effect was observed. The narrow-sense heritability ranged from low (33.26%) to intermediate (43.05%). Partial dominance was observed for low potassium content in the seeds. No increase in potassium content was obtained through selection. Breeding common bean plants for increasing potassium content in seeds may be difficult because the local environment strongly influences the character.Index terms: Phaseolus vulgaris, heritability, maternal effect, nutritional quality, selection gain. Controle genético do teor de potássio em sementes de feijãoResumo -O objetivo deste trabalho foi investigar um possível efeito materno no teor de potássio em sementes de feijão-comum (Phaseolus vulgaris), além de estimar a herdabilidade e o ganho na seleção em gerações precoces quanto a esse caráter e avaliar a eficiência da seleção em aumentar a qualidade nutricional do feijão. Cruzamentos entre quatro cultivares do grupo gênico Mesoamericano produziram as gerações F 1 e F 2 recíprocas e os retrocruzamentos (RCP 1 e RCP 2 ). O teor de potássio das progênies foi medido por digestão nítrico-perclórica e uso de fotometria de chama. O teor de potássio nas progênies testadas variou de 6,0 a 14,9 g kg -1 de matéria seca, e nenhum efeito materno significativo foi observado. A herdabilidade em sentido restrito variou de baixa (33,26%) à intermediária (43,05%). Foi observada dominância parcial quanto ao baixo teor de potássio nas sementes. Nenhum aumento no teor de potássio foi obtido por meio de seleção. O melhoramento para aumentar o teor de potássio em sementes de feijão-comum pode apresentar dificuldades, porque o efeito de ambiente influencia fortemente o caráter.Termos para a indexação: Phaseolus vulgaris, herdabilidade, efeito materno, qualidade nutricional, ganho na seleção.

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“…It has been suggested that this observation might be because of the differing experimental materials used (Eshed and Zamir, 1996). Another explanation might be the difference in the reproduction type of the examined species, as studies in autogamous species have more often provided evidence for the importance of epistasis than studies in allogamous species (Holland, 2001).…”

Section: Introductionmentioning

confidence: 99%

Detection of epistatic interactions in association mapping populations: an example from tetraploid potato

Stich

Gebhardt

2011

Heredity

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Epistatic interactions among loci are expected to contribute substantially to variation of quantitative traits. The objectives of our research were to (i) compare a classical mixed-model approach with a combined mixed-model and analysis of variance approach for detecting epistatic interactions; (ii) examine using computer simulations the statistical power to detect additiveadditive, additive-dominance and dominance-dominance epistatic interactions and (iii) detect epistatic interactions between candidate genes for resistance to leaf blight in a set of tetraploid potato clones. Our study was based on the genotypic and phenotypic data of 184 tetraploid potato cultivars as well as computer simulations. The number of significant (a * ¼ 1 Â 10 À6 ) epistatic interactions ranged for the three examined traits from 3 to 32. Our findings suggested that the combined mixedmodel and analysis of variance approach leads in comparison with the classical mixed-model approach not to an increased rate of false-positives. The results of the computer simulations suggested that, if molecular markers are available that are in high LD (D 0 40.9) with the trait-coding loci, the statistical power to detect epistatic interactions, which explain 5-10% of the phenotypic variance, was of a size that seems promising for their detection.

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Epistasis and Plant Breeding

Cited by 125 publications

References 168 publications

Direct mapping of density response in a population of B73 × Mo17 recombinant inbred lines of maize (Zea Mays L.)

Direct mapping of density response in a population of B73 × Mo17 recombinant inbred lines of maize (Zea Mays L.)

Genetic control of potassium content of common bean seeds

Detection of epistatic interactions in association mapping populations: an example from tetraploid potato

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