Genetic correlation between traits in the ESALQ-PB1 maize population divergently selected for tassel size and ear height

Neto, A. L. Farias; Filho, José Branco de Miranda

doi:10.1590/s0103-90162001000100018

Cited by 13 publications

(8 citation statements)

References 8 publications

(6 reference statements)

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“…Correlation of TB and TW were positive and low (r A between 0.02 and 0.22) with the yield traits and higher (r A between 0.19 and 0.40) with EL. Both additive and phenotypic correlation between TW and TL was around 0.22, which are very close to the genetic correlation (0.232) reported by Farias Neto & Miranda Filho (2001).…”

Section: Resultssupporting

confidence: 85%

“…PH and EH were positively correlated to tassel traits with r A varying from 0.10 (EH.TL) to 0.44 (EH.TB). Also are reported positive genetic and phenotypic correlations between PH and EH with tassel traits (TB and TL) in the range of 0.135 to 0.438 (Farias Neto & Miranda Filho, 2001). For the tassel traits (Table 5) the highest correlation was for TB.TW (r A = 0.63).…”

Section: Resultsmentioning

confidence: 87%

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Quantitative variation in the tropical maize population, ESALQ-PB1

Andrade

Filho²

2008

Sci. agric. (Piracicaba, Braz.)

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Good yield and intermediate plant height, ear height, and tassel size characterize the maize population ESALQ-PB1 as an outstanding breeding population. Estimates of genetic parameters are reported for 13 traits: plant height (PH), ear height (EH), ear placement (EP), tassel length (TL), tassel weight (TW), tassel branch number (TB), ear weight (EW), total grain weight (GW), ear length (EL), ear diameter (ED), kernel row number (RN), kernel number per row (KR) and prolificacy (PR). Results refer to one location and one year. Genetic variation was detected for all traits, and the estimates of the additive genetic variance are presented. The coefficients of heritability (individual basis) varied from 0.14 to 0.72 and were considered high for PH, EH and TB; intermediate for EP, TL, TW, EL, EP, ED and RN, and low for EW, GW, KR and PR. The coefficient of heritability (progeny mean basis) showed approximately the same trend and varied from 0.40 to 0.75. The highest expected gain from selection was for TB (27% per cycle) under mass selection and for TW (16.4%) under progeny selection; the lowest expected gain was for ED either for mass selection (1.9%) or progeny selection (2.9%). Additive correlation coefficients (r A ) of 0.5

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Section: Resultssupporting

confidence: 85%

Section: Resultsmentioning

confidence: 87%

Quantitative variation in the tropical maize population, ESALQ-PB1

Andrade

Filho²

2008

Sci. agric. (Piracicaba, Braz.)

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“…There is a positive association between taller plants and increased number of days to flower, but with magnitude values that allow the selection of plants with higher yield, small height and number of days to flower. With the exception of the trait days to flower, the correlations observed in landraces within family farm systems are the same presented in several other reports (Lemos et al, 1992, González et al, 1994Hallauer and Miranda Filho, 1995;Farias Neto and Miranda Filho, 2001;Silva et al, 2001;Saleh et al, 2002;Daros et al, 2004;Santos et al, 2005;Andrade and Miranda Filho, 2008), but with different magnitudes in some cases.…”

Section: Resultssupporting

confidence: 85%

“…), v.67, n.6, p.685-691, November/December 2010 fore, the selection for another trait may result in indirect response in the low heritable trait, provided the following conditions are satisfied: the genetic correlation between them is substantial, and the heritability of the secondary trait is greater than that of the primary trait (Hallauer and Miranda Filho, 1995). Many authors have estimated genetic correlations among different maize traits in different maize types (Lemos et al, 1992;González et al, 1994;Pinto et al, 2000;Silva et al, 2001;Farias Neto and Miranda Filho, 2001;Saleh et al, 2002;Granate et al, 2002;Daros et al, 2004;Santos et al, 2005;Andrade and Miranda Filho, 2008). However, there is limited published research with genetic correlation estimates for maize landraces.…”

Section: Introductionmentioning

confidence: 99%

Phenotypic, additive genetic and environment correlations of maize landraces populations in family farm systems

Barros

Moreira

Ferreira

2010

Sci. agric. (Piracicaba, Braz.)

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Knowledge of the association between characters is very important in the genetic breeding programs, but there is limited information about correlations between traits in maize landraces in the current literature. The objectives of this study were to estimate phenotypic, additive genetic and environment correlations among traits in maize landraces, which were cultivated in family farm systems, in order to guide the participatory breeding on maize landraces. Between 294 and 400 half-sib progenies from the six populations were evaluated, subdivided in triple 7X7 and 10X10 lattice design, respectively, with single row plots of 4 m long and spaced 1.00 × 0.20 m. Estimates of correlation coefficients are reported for nine traits: grain yield (GY), relation grain weight per ear weight (GE), ears per plant (EP), days to flower (DF), plant height (PH), ear height (EH), percentage of root loding (%L), percentage of stalk loding (%BS) and percentage of damaged ears (%DE). A high number of additive genetic correlation (r A ) was obtained between grain yield and the other traits, in maize landraces populations, cycles and locations. For grain yield, the highest averages of the r A estimate were with EP (0.67), GE (0.47) and %DE (-0.63). In contrast to the current published researches, negative correlations between grain yield and days to flower were observed. Key words: Zea mays L., population, recurrent selection, participatory breeding Correlações fenotípicas, genéticas aditivas e ambientais de populações de milho crioulo em sistemas de agricultura familiar RESUMO: O conhecimento da associação entre caracteres é de grande importância nos programas de melhoramento genético, contudo a literatura apresenta limitadas informações sobre correlações em populações de milho crioulo. Os objetivos deste estudo foram estimar correlações fenotípicas, genéticas aditivas e ambientais entre caracteres de populações de milho crioulo, cultivados em sistemas de agricultura familiar, para orientar o programa de melhoramento genético participativo. Entre 294 e 400 de progênies de meios-irmãos de seis populações, foram avaliadas em látices triplos 7X7 e 10X10, respectivamente, com parcelas de 4 m de comprimento e espaçadas 1,00 × 0,20 m. Os coeficientes de correlações foram estimados para nove características: produtividade de grãos total (GY), relação peso de grãos por peso de espiga (GE), nº de espigas por planta (EP), nº de dias do florescimento (DF), altura da planta (PH), altura espiga (EH), porcentagem de acamamento (%L), porcentagem de colmos quebrados (%BS) e porcentagem de espigas danificadas (%DE). Houve um alto número de correlação genética aditiva (r A ) entre produtividade de grãos e as demais características, nas populações de milho crioulo, ciclos e locais. As maiores médias das estimativas r A para o produtividade de grãos foram com EP (0,67), GE (0,47) e DE% (-0,63). Diferentemente dos trabalhos publicados, foram observadas correlações negativas entre produtividade de grãos e dias para florescimento. Palavras-chave: Z...

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“…tassel branches was assessed because it can give a negative correlation with maize yield (Farias Neto & Miranda Filho, 2001). …”

Section: Resultsmentioning

confidence: 99%

Weed Control in Maize with Gliricidia Intercropping

et al. 2015

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-One of the very important components in the organic maize production costs refers to spending on weed control. In this research were assessed the effects of maize hybrids (AG 1051 and BR 205) in an intercropping with Gliricidia (Gliricidia sepium) and mechanical hoeing on weed control. The treatments assessed were: A -maize monocropping + two hoeings (20 and 40 days after sowing); B -maize with one hoeing at 20 days + intercropping with gliricidia sowed after hoeing; C -maize sowing intercropped with gliricidia at the time of maize sowing + hoeing at 40 days; D -maize sowing intercropped with gliricidia at the time of maize sowing without hoeing; E -monocropping maize without hoeing. In the intercroppings, gliricidia was sowed in broadcast seeding with 30 viable seeds m -2. Maize hybrids did not differ in their effects on weed growth and grain yield. Treatments A, B and C have reduced weed growth, compared to treatments D and E. The highest grain yield was obtained with treatment A and the lowest with treatment E. It was concluded that intercropping maize and gliricidia is not a good alternative for an integrated weed management in maize crops in the conditions assessed.Keywords: Zea mays, Gliricidia sepium, maize yield. RESUMO -Um dos componentes de grande importância nos custos de produção do milho orgânico refere-se aos gastos com o controle das plantas daninhas. Nesta pesquisa, foram avaliados os efeitos de híbridos de milho (AG 1051 e BR 205) em consórcio com gliricídia (Gliricidia sepium) e capinas mecânicas no controle de plantas daninhas. Foram avaliados os seguintes tratamentos: Acultivo do milho solteiro com duas capinas (20 e 40 dias após a semeadura); B -consórcio com uma

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Genetic correlation between traits in the ESALQ-PB1 maize population divergently selected for tassel size and ear height

Cited by 13 publications

References 8 publications

Quantitative variation in the tropical maize population, ESALQ-PB1

Quantitative variation in the tropical maize population, ESALQ-PB1

Phenotypic, additive genetic and environment correlations of maize landraces populations in family farm systems

Weed Control in Maize with Gliricidia Intercropping

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