Popcorn parental selection based on genetic divergence

Carpentieri-Pípolo, Valéria; André, Flávio; Silva, Martins da; Seifert, Adilson Luiz

doi:10.12702/1984-7033.v03n04a03

Cited by 7 publications

(6 citation statements)

References 7 publications

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“…Avaliar corretamente os genótipos para essas características é de fundamental importância. A ampla variabilidade genética verificada em muitas populações (MiRANDA et al, 2007) conduz à hipótese de que há possibilidade de seleção de material com alta capacidade de expansão, produtividade elevada e resistência às doenças (CARPENTiERi-PíPOLO et al, 2003).…”

Section: Introductionunclassified

Novos compostos de milho-pipoca para o Brasil

et al. 2010

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ResumoApesar dos avanços, o número de variedades e híbridos comerciais de linhagens de milho-pipoca é reduzido. Assim, o objetivo deste trabalho foi avaliar novos compostos desenvolvidos no Brasil e indicar os de maior potencial genético para iniciar um trabalho de melhoramento intrapopulacional. A pesquisa foi desenvolvida no ano agrícola 2005/2006. Os tratamentos constaram de 21 genótipos (híbridos de linhagens, compostos e sintéticos) cultivados em dois municípios, Umuarama e Cidade Gaúcha, ambos no Noroeste do Estado do Paraná. As características avaliadas por meio de análises de variância individuais e conjunta foram rendimento de grãos (RG) e capacidade de expansão (CE). Os compostos UEM 5, UEM 6 e UEM 7 expressaram alta qualidade da pipoca (CE), com valores semelhantes às testemunhas em ambos os locais. O rendimento dos genótipos foi mais instável do que a capacidade de expansão entre os locais avaliados. Os compostos UEM 5, UEM 6 e UEM 7 revelaram potencial satisfatório tanto para CE quanto para RG quando avaliados em Umuarama, PR. Palavras-chave: Zea mays, rendimento de grãos, capacidade de expansão AbstractAlthough advances are obtained, the number of varieties and hybrids from inbred lines of popcorn are reduced. The objective of this work was to evaluate new composites developed in Brazil and to indicate those which present better potential to initiate an intrapopulation breeding program. Trials were carried out during 2005/2006 cropping season. Treatments included 21 genotypes (hybrid from inbred lines, composites and synthetic) cultivated in two locations (Umuarama and Cidade Gaúcha), both located in Northwest of Paraná State. Grain yield (GY) and popping expansion (PE) were evaluated by individual and joint analyses of variance. Composites UEM 5, UEM 6 and UEM 7 obtained the highest quality of the PE, with similar values to the check treatments in both locations. GY of genotypes ranged more than popping expansion over locations. Composites UEM 5, UEM 6 and UEM 7 revealed satisfactory potential both PE and GY when evaluated in Umuarama, Paraná State, Brazil.

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Novos compostos de milho-pipoca para o Brasil

et al. 2010

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“…Miranda et al (2003) evaluated breeding potential and genetic divergence in nine tropical popcorn cultivars by using multivariate analysis techniques. Carpentieri-Pipolo et al (2003) also evaluated genetic divergence among nine popcorn populations, by using the grouping method of Tocher and canonic variables (Rao 1952). Li et al (2004) evaluated the level of genetic diversity among popcorn inbreds with broad genetic background by using SSR markers.…”

Section: Introductionmentioning

confidence: 99%

Genetic variability and heterotic groups of Brazilian popcorn populations

et al. 2007

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The development of successful advanced lines and cultivars in maize is dependent on parental selection and assignment to deWned heterotic groups. So, the objectives of this study were to evaluate genetic variability and identify heterotic groups among Brazilian popcorn varieties. Thus, diallel crosses of advanced generations of the popcorn hybrids, IAC 112 and Zélia, and of three open-pollinated popcorn varieties, RS 20, Branco, and SAM were performed. Ten hybrid combinations, the Wve parents, and Wve check treatments were arranged in a block design with four replicates in two tropical-zone locations (CWb climate). Both additive and non-additive eVects were important for grain yield, plant height, ear height, and husk cover. For popping expansion, only the additive eVects were important. Hybrid combinations between the local variety (Branco) and F 2 populations (IAC 112 and Zelia) resulted in the third and fourth highest values for popping expansion. The best grain yields were obtained with hybrid combinations involving SAM. Cultivars Zélia, IAC 112, and RS 20 increased popping expansion, whereas cultivar Branco increased grain yield of hybrid combinations. The following conclusions may be drawn: Brazilian popcorn populations have reduced heterosis and genetic variability to popping expansion in relation commercial cultivars; there is genetic variability among Brazilian popcorn populations that allows the exploitation of additive and nonadditive eVects for grain yield; it is possible to increase grain yield by using local varieties; but it would be diYcult to obtain commercial hybrids from local varieties because they have poor performance for popping expansion.

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“…In general, breeders try to VR Lopes et al use crosses between divergent and high-yielding plants (Carpentieri-Pípolo et al 2003, Cruz et al 2004b. Knowledge on genetic divergence is therefore fundamental to identify and organize the available genetic resources aiming at the production of promising cultivars (Palomino et al 2005).…”

Section: Introductionmentioning

confidence: 99%