Genetic gain estimates using different selection index methods in three
                  potato hybrid populations

The objective of this study was to compare the efficiency of different selection index methods for superior potato clones. The experiment was carried out at the experimental field of Embrapa Clima Temperado in Pelotas, Rio Grande do Sul State, Brazil, in the spring season of 2008. Three hybrid populations of potato derived from crosses between advanced clones of Embrapa potato breeding program and foreign cultivars were studied. The experimental design was an augmented block with four replications. The use of selection indexes resulted in higher selection gains, with better distribution among traits. The best selection index found to be used in potato breeding programs are the multiplicative of Subandi et al. (1973) and the index based on the sum of ranks proposed by Mulamba & Mock (1978).

Solanum tuberosum; breeding; heritability

Authorship

Laerte R Terres

Universidade Federal de Pelotas; Pelotas-RS, Brasil; laerte_terres@yahoo.com.br (autor para correspondência)Universidade Federal de PelotasBrasilPelotas, RS, BrasilUniversidade Federal de Pelotas; Pelotas-RS, Brasil; laerte_terres@yahoo.com.br (autor para correspondência)

Emerson Lenz

Caroline M Castro

Embrapa Clima Temperado, Pelotas-RS, Brasil; caroline.castro@embrapa.br, arione.pereira@embrapa.brEmbrapa Clima TemperadoBrasilPelotas, RS, BrasilEmbrapa Clima Temperado, Pelotas-RS, Brasil; caroline.castro@embrapa.br, arione.pereira@embrapa.br

Arione S Pereira

SCIMAGO INSTITUTIONS RANKINGS

Tables | Formulas

Tables (2)
Formulas (3)

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Tabela 1.
Estimativas das médias, herdabilidades (h²) e ganhos de seleção em porcentagem (GS%), obtidos pela seleção direta e indireta (SEL) e pelo índice clássico de Smith (1936SMITH HF. 1936. A discriminant function for plant selection. Annual Eugenics 7: 240-250.) e Hazel (1943HAZEL LN. 1943. The genetic basis for constructing selection indexes. Genetics28: 476-490.) (SH), em três populações híbridas de batata, considerando cada caráter como principal {mean, heritability (h²⁾ and selection gain estimates in percentage (GS%), obtained by direct and indirect selection (SEL), and by the classic index of Smith (1936SMITH HF. 1936. A discriminant function for plant selection. Annual Eugenics 7: 240-250.) and Hazel (1943HAZEL LN. 1943. The genetic basis for constructing selection indexes. Genetics28: 476-490.) (SH), in three hybrid potato populations, considering each trait as principal}. Pelotas, UFPel, 2014.

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Tabela 2.
Estimativas de ganhos com a seleção (GS%) para caracteres de rendimento e aparência de tubérculos de batata pelos índices propostos por Smith (1936SMITH HF. 1936. A discriminant function for plant selection. Annual Eugenics 7: 240-250.) e Hazel (1943HAZEL LN. 1943. The genetic basis for constructing selection indexes. Genetics28: 476-490.), (SH), Mulamba & Mock (1978MULAMBA NN; MOCK JJ. 1978. Improvement of yield potential of the Eto Blanco maize (Zea mays) population by breeding for plant traits. Egyptian Journal of Genetics and Cytology7: 40-57.) (MM), Willians (1962WILLIANS JS. 1962. The evaluation of a selection index. Biometrics18: 375-393.) (BW), Pesek & Baker (1969PESEK J; BAKER RJ. 1969. Desired improvement in relation to selected indices. Canadian Journal of Plant Science 49: 803-804.) (PB), multiplicativo de Subandi et al. (1973SUBANDI W; COMPTON A; EMPIG LT. 1973. Comparison of the efficiencies of selection indices for three traits in two variety crosses of corn. Crop Science 13: 184-186.) (MUL) e Elston (1963ELSTON RC. 1963. A weight free index for the purpose of ranking of selection with respect to several traits at a time. Biometrics19: 85-87.) (ELS), com os pesos econômicos e ganhos desejados (PE/GD), e respectivas situações de seleção {estimated selection gains (GS%) for the yield and tuber appearance traits of potatoes by the indexes proposed by Smith (1936SMITH HF. 1936. A discriminant function for plant selection. Annual Eugenics 7: 240-250.) and Hazel (1943HAZEL LN. 1943. The genetic basis for constructing selection indexes. Genetics28: 476-490.) (SH), Mulamba & Mock (1978MULAMBA NN; MOCK JJ. 1978. Improvement of yield potential of the Eto Blanco maize (Zea mays) population by breeding for plant traits. Egyptian Journal of Genetics and Cytology7: 40-57.) (MM), Williams (1962)WILLIANS JS. 1962. The evaluation of a selection index. Biometrics18: 375-393. (BW), Pesek & Baker (1969PESEK J; BAKER RJ. 1969. Desired improvement in relation to selected indices. Canadian Journal of Plant Science 49: 803-804.) (PB), multiplicative of Subandi et al. (1973SUBANDI W; COMPTON A; EMPIG LT. 1973. Comparison of the efficiencies of selection indices for three traits in two variety crosses of corn. Crop Science 13: 184-186.) (MUL), and Elston (1963ELSTON RC. 1963. A weight free index for the purpose of ranking of selection with respect to several traits at a time. Biometrics19: 85-87.) (ELS), with economic weight and desired gains (PE/GD), and respective selection situations)}. Pelotas, UFPel, 2014.

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Tabela 1. Estimativas das médias, herdabilidades (h²) e ganhos de seleção em porcentagem (GS%), obtidos pela seleção direta e indireta (SEL) e pelo índice clássico de Smith (1936SMITH HF. 1936. A discriminant function for plant selection. Annual Eugenics 7: 240-250.) e Hazel (1943HAZEL LN. 1943. The genetic basis for constructing selection indexes. Genetics28: 476-490.) (SH), em três populações híbridas de batata, considerando cada caráter como principal {mean, heritability (h²⁾ and selection gain estimates in percentage (GS%), obtained by direct and indirect selection (SEL), and by the classic index of Smith (1936SMITH HF. 1936. A discriminant function for plant selection. Annual Eugenics 7: 240-250.) and Hazel (1943HAZEL LN. 1943. The genetic basis for constructing selection indexes. Genetics28: 476-490.) (SH), in three hybrid potato populations, considering each trait as principal}. Pelotas, UFPel, 2014.

MTT= Massa total de tubérculos (total tuber yield); PER= percentual de tubérculos comerciais (percentage of marketable tubers); MME= massa média de tubérculos (average tuber weight); TEX= textura de película dos tubérculos (skin texture of tubers).

Tabela 2. Estimativas de ganhos com a seleção (GS%) para caracteres de rendimento e aparência de tubérculos de batata pelos índices propostos por Smith (1936SMITH HF. 1936. A discriminant function for plant selection. Annual Eugenics 7: 240-250.) e Hazel (1943HAZEL LN. 1943. The genetic basis for constructing selection indexes. Genetics28: 476-490.), (SH), Mulamba & Mock (1978MULAMBA NN; MOCK JJ. 1978. Improvement of yield potential of the Eto Blanco maize (Zea mays) population by breeding for plant traits. Egyptian Journal of Genetics and Cytology7: 40-57.) (MM), Willians (1962WILLIANS JS. 1962. The evaluation of a selection index. Biometrics18: 375-393.) (BW), Pesek & Baker (1969PESEK J; BAKER RJ. 1969. Desired improvement in relation to selected indices. Canadian Journal of Plant Science 49: 803-804.) (PB), multiplicativo de **Subandi et al. (1973SUBANDI W; COMPTON A; EMPIG LT. 1973. Comparison of the efficiencies of selection indices for three traits in two variety crosses of corn. Crop Science 13: 184-186.) (MUL) e Elston (1963ELSTON RC. 1963. A weight free index for the purpose of ranking of selection with respect to several traits at a time. Biometrics19: 85-87.) (ELS), com os pesos econômicos e ganhos desejados (PE/GD), e respectivas situações de seleção {estimated selection gains (GS%) for the yield and tuber appearance traits of potatoes by the indexes proposed by Smith (1936SMITH HF. 1936. A discriminant function for plant selection. Annual Eugenics 7: 240-250.) and Hazel (1943HAZEL LN. 1943. The genetic basis for constructing selection indexes. Genetics28: 476-490.) (SH), Mulamba & Mock (1978MULAMBA NN; MOCK JJ. 1978. Improvement of yield potential of the Eto Blanco maize (Zea mays) population by breeding for plant traits. Egyptian Journal of Genetics and Cytology7: 40-57.) (MM), Williams (1962)WILLIANS JS. 1962. The evaluation of a selection index. Biometrics18: 375-393. (BW), Pesek & Baker (1969PESEK J; BAKER RJ. 1969. Desired improvement in relation to selected indices. Canadian Journal of Plant Science 49: 803-804.) (PB), multiplicative of Subandi et al. (1973SUBANDI W; COMPTON A; EMPIG LT. 1973. Comparison of the efficiencies of selection indices for three traits in two variety crosses of corn. Crop Science 13: 184-186.) (MUL), and Elston (1963**ELSTON RC. 1963. A weight free index for the purpose of ranking of selection with respect to several traits at a time. Biometrics19: 85-87.) (ELS), with economic weight and desired gains (PE/GD), and respective selection situations)}. Pelotas, UFPel, 2014.

PER= percentual de tubérculos comerciais (percentage of marketable tubers); MME= massa média de tubérculos (average tuber weight); MTT= massa total de tubérculos (total tuber yield); TEX= textura de película (tuber skin texture); ¹Massa total de tubérculos como caráter principal (total tuber weight as principal trait); ²Textura como caráter principal (texture as principal trait); ³Todos caracteres como principais (all traits considered as principal); ⁴Coeficiente de variação genético (coefficient of genetic variation); ⁵Desvio-padrão genético (genetic standard deviation); ⁶Método que utiliza valores mínimos para seleção (method that uses minimum values for selection).

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Associação Brasileira de Horticultura Embrapa Hortaliças, C. Postal 218, 70275-970 Brasília-DF, Tel. (61) 3385 9099, Tel. (81) 3320 6064, www.abhorticultura.com.br - Vitoria da Conquista - BA - Brazil
E-mail: associacaohorticultura@gmail.com

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Genetic gain estimates using different selection index methods in three potato hybrid populations

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[TFN1] MTT= Massa total de tubérculos (total tuber yield); PER= percentual de tubérculos comerciais (percentage of marketable tubers); MME= massa média de tubérculos (average tuber weight); TEX= textura de película dos tubérculos (skin texture of tubers).