Resposta de híbridos de milho cultivados em diferentes épocas à população de plantas e ao despendoamento

Sangoi, Luís; Guidolin, Altamir Frederico; Silva, Paulo Regis Ferreira da

doi:10.1590/s0103-84782006000500004

Cited by 11 publications

(9 citation statements)

References 8 publications

(3 reference statements)

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“…Duvick (2005) reported on a study conducted with corn hybrids in Iowa, in a time series from 1930 to 1991, an average reduction of 0.5 grams per decade in tassel dry weight. Likewise, Sangoi et al (2006), while carrying out tassel removal in commercial corn hybrids, showed significant grain yield increase, 7%, in the mean yield of analyzed genotypes.…”

Section: Resultsmentioning

confidence: 96%

Variance components and association between corn hybrids morpho-agronomic characters

Souza¹,

Baretta²,

Nardino³

et al. 2015

Científica

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The present work aimed at evaluating the canonical correlations between traits of grain yield and morphological traits in maize, in order to verify the associations and interdependence among groups. The experiment was conducted in the agricultural year 2010/2011; consisted of 25 corn hybrids, allocated in five locations of the states of Paraná, Santa Catarina e Rio Grande do Sul. Settled two groups of traits, with Group I comprised agronomic characters of grain yield: grain yield plot, the total weight of grains and weight of hundred grains and the group II formed by morphology: stem diameter , leaf angle , tassel length , number of tassel branches , total leaf area , insertion of the ear , plant height in maize. The first, second and third canonical pair proved significant at the 1% level of probability, using the chi-square test, indicating that the groups are not independent. Hybrids with higher plant height, insertion of ear and leaf angle and fewer branches and tassel length are associated with the increase in weight of hundred grains in maize. To increase the grain weight, should be considered hybrids with greater insertion of the ear, leaf area and shorter length of the tassel. The increase in leaf area, as well as smaller tassel length is related positively to increase grain yield in maize.Additional keywords: associations between characters; multivariate analysis; Zea mays L. ResumoO presente trabalho objetivou avaliar as correlações canônicas entre caracteres que compõem o rendimento de grãos e caracteres morfológicos em milho, visando a verificar as associações e a interdependência entre os grupos. O experimento foi conduzido no ano agrícola de 2010/2011, compreendido por 25 híbridos simples de milho, alocados em cinco locais dos Estados do Paraná, Santa Catarina e Rio Grande do Sul, Brasil. Estabeleceram-se dois grupos de caracteres, sendo o grupo I formado por caracteres agronômicos que compõem o rendimento de grãos: rendimento de grãos da parcela (RG), massa total de grãos da espiga (MG) e massa de cem grãos (MCG), e o grupo II formado por caracteres morfológicos: diâmetro do colmo (DC), ângulo de folha (AF), comprimento do pendão (CP), número de ramificações do pendão (NR), área foliar total (AFT), altura da inserção da espiga (AE) e altura de planta (AP) em milho. O primeiro, o segundo e o terceiro pares canônicos revelaram-se significativos a nível de 1% de probabilidade, pelo teste qui-quadrado, indicando que os grupos não são independentes. Híbridos com maiores altura de plantas, de inserção de espiga e ângulo foliar e menor número de ramificações e comprimento do pendão estão associados com o incremento da massa de cem grãos em milho. Para incremento de massa de grãos, devem ser considerados híbridos com maior altura da inserção da espiga, área foliar e menor comprimento do pendão. O aumento da área foliar, assim como menor comprimento do pendão, está relacionado favoravelmente para o aumento do rendimento de grãos em milho.Palavras-chave adicionais: análise multivariada; associações ...

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Section: Resultsmentioning

confidence: 96%

Variance components and association between corn hybrids morpho-agronomic characters

Souza¹,

Baretta²,

Nardino³

et al. 2015

Científica

View full text Add to dashboard Cite

show abstract

“…On the other hand, lines 1, 3, 4, 5, 6, 13 and 15 showed positive magnitude, indicating the presence of additive alleles for expression of longer length of tassel, a characteristic that is little desired in the production of simple hybrids due to the higher energy demand by the reproductive structure, and because the apical meristem has priority on the partition of photoassimilates, thus, crossings that result in hybrids with smaller tassel are sought (Sangoi et al, 2006).…”

Section: Resultsmentioning

confidence: 99%

“…Negative estimates should be observed due to the fact that modern hybrids, developed with high grain yield, present smaller tassel, thus reducing the effect of apical dominance in stress conditions, which favors the best grain filling (Sangoi et al, 2006).…”

Section: Resultsmentioning

confidence: 99%

“…These changes, whether spontaneous or not, have provided changes in the morphological characteristics, especially of the tassel (Neto and Miranda-Filho, 2001). Apical structures have priority in the use of available resources, especially when subjected to conditions of stress (Sangoi et al, 2006). It were also identified, by techniques of biometric analysis in diallel crosses, associations of the tassel characters with characters such as ear height, ear placement, prolificacy, leaf angle, which in turn relate directly with mass of corn kernels (Mickelson et al, 2002;Jung et al, 2007;Andrade and Miranda-Filho, 2008).…”

Section: Introductionmentioning

confidence: 99%

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Partial diallel analysis among maize lines for characteristics related to the tassel and the productivity

Nardino¹,

Souza²,

Baretta³

et al. 2016

Afr. J. Agric. Res.

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Diallel crosses are important to the prediction of the best combinations among different heterotic groups of maize lines. The work objective was to estimate the combining ability among inbred lines from two heterotic groups to predict the best combinations in traits related to tassel and grain yield, conducted in five environments in the southern region. The inbred lines of the two heterotic groups are from the company KSP seeds. The tests were conducted based on crosses with partial diallel, using 15 female parents and male parents 8, 2011/2012 agricultural harvest in five environments in randomized blocks design with three replications. The variables analyzed were tassel length (TL), distance from the last node to the first branch of the tassel (DLN), distance from the flag leaf to the first branch of the tassel (DFL), number of tassel branches (NB), mass thousand grains (MTG) and grains yield (GY). The data were submitted the individual and joint variance analysis, after were realized analyze partial diallel analysis. The additive effects were more important for group II, already to the group I the non-additive effects were more pronounced, for the traits tassel and of yield. The GCA (group I) of lines inbred 15; 4 and 3-4 (group II) are favorable for increasing the grains yield. The crosses promising tassel traits been: 1-3, 2-4, 3-3, 4-4, 7-3,

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“…Larger tassels act as a drain for photoassimilates, which could be directed toward grain production, and restrict the passage of solar radiation through the canopy (Edwards, 2011). In addition, smaller tassels produce lower levels of auxins and decrease apical dominance, which has an inhibitory effect on ear development (Sangoi et al, 2006). In addition to the environment, it permits the production of one or more ear per plant.…”

Section: Introductionmentioning

confidence: 99%

Sample sizes to estimate mean values for tassel traits in maize genotypes

et al. 2016

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Tassel traits are important in maize breeding programs aiming to reduce the size and number of branches and maintain satisfactory pollen production in order to increase grain yield. The objectives of this study were to determine the sample size (number of tassels) required to estimate the mean values for tassel traits in maize genotypes and to verify the variability of sample size among genotypes. Twenty maize genotypes were evaluated in an experiment carried out in a randomized block design with three replicates. Twenty tassels were randomly collected in each plot, for a total of 1200 tassels. In each tassel, the following traits were measured: peduncle dry matter, branching space dry matter, central spike dry matter, tassel dry matter, peduncle length, branching space length, central spike length, tassel length, tassel dry matter to tassel length ratio, number of primary branches, number of secondary branches, and tassel branch number. Measures of central tendency and variability were calculated, analysis of variance and mean comparison tests were performed, normality was verified, and the sample size was determined. In order to estimate the means with the same precision, the sample size for weight traits was greater than that for length traits. For tassel traits, 11, 20, and 43 tassels are sufficient to estimate the mean with a precision of 40, 30, and 20%, respectively, of the estimated mean at a 95% confidence level. These data show that there is sample size variability among maize genotypes.

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Resposta de híbridos de milho cultivados em diferentes épocas à população de plantas e ao despendoamento

Cited by 11 publications

References 8 publications

Variance components and association between corn hybrids morpho-agronomic characters

Variance components and association between corn hybrids morpho-agronomic characters

Partial diallel analysis among maize lines for characteristics related to the tassel and the productivity

Sample sizes to estimate mean values for tassel traits in maize genotypes

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