Caracterização morfológica e molecular de acessos de melancia

Silva, Maria Luciene da; Queiróz, M. A. de; Ferreira, M. A. J. F.; Buso, G. S. C.

doi:10.1590/s0102-05362006000400002

Cited by 17 publications

(11 citation statements)

References 4 publications

(1 reference statement)

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“…According to Silva et al (2006), producer selection made tends to fix different types in certain regions, as observed in the accessions from Maranhão, with the appearance of specific groups.…”

Section: Discussionmentioning

confidence: 99%

Genetic variability of watermelon accessions based on microsatellite markers

Gama¹,

Santos²,

Dias³

2013

Genet. Mol. Res.

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ABSTRACT. We analyzed the genetic variability of 40 watermelon accessions collected from 8 regions of Northeastern Brazil using microsatellite markers, in order to suggest strategies of conservation and utilization of genetic variability in this species. These accessions are not commercial cultivars. They were sampled in areas of traditional farmers that usually keep their own seeds for future plantings year after year. An UPGMA dendrogram was generated from a distance matrix of the Jaccard coefficient, based on 41 alleles of 13 microsatellite loci. Analysis of molecular variance was made by partitioning between and within geographical regions. The similarity coefficient between accessions ranged from 37 to 96%; the dendrogram gave a co-phenetic value of 0.80. The among population genetic variability was high ( populations, so regional species diversity will be better represented and preserved in the germplasm bank.

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Section: Discussionmentioning

confidence: 99%

Genetic variability of watermelon accessions based on microsatellite markers

Gama¹,

Santos²,

Dias³

2013

Genet. Mol. Res.

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“…When we evaluated commercial cultivars (witnesses) and accessions, witnesses typically formed separate clusters and accessions form one or few clusters. This segregation has already been observed between cultivar Crimson Sweet (CS) and accessions collected in Mossoró-RN and in three regions of Bahia, with data evaluated using graphic dispersion, the generalized Mahalanobis distance, and the UPGMA method (Oliveira et al, 2008;Silva et al, 2006). Segregation between accessions and commercial cultivars is due to two factors.…”

Section: Analysis Of Genetic Diversity Of Accessions In Each Experimentsmentioning

confidence: 73%

“…Mean variation coefficient (VC) was 17.8% in experiment 1 and 16.3% in experiment 2 (Table 1). High variation coefficients are typically found in morphological characterization experiments of watermelon accessions (Oliveira et al, 2008;Silva et al, 2006). This might be explained by the nature of quantitative traits, which are more sensitive to environmental variations , but also by the existence of genetic variation within accessions.…”

Section: Variability In Watermelon Accessionsmentioning

confidence: 99%

Integration of quantitative and qualitative descriptors for genetic diversity studies of watermelon accessions

Lima¹,

Queiróz²,

Oliveira³

et al. 2017

Aust J Crop Sci

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Most of genetic diversity studies are based only on quantitative descriptors. The aim of this study was to apply different analysis strategies with quantitative and qualitative descriptors to identify which is the most suitable to integrate descriptors for genetic diversity studies of watermelon (Citrullus lanatus) germplasm using different assays. A total of 20 watermelon accessions were evaluated in the State of Rio Grande do Norte and two commercial cultivars were used as witness (control) (Crimson Sweet and Charleston Gray) in two cultivation seasons (2014/2015), using 49 descriptors, in which 26 were quantitative and 23 were qualitative. The genetic diversity of the accessions was obtained using eight analysis strategies that combined the Mahalanobis Distance, Average Standardized Euclidean Distance (SED), and Weighted Average Euclidean Distance, followed by groupings using the Tocher optimization method. A wide morphological variability was observed between and within accessions. The eight different strategies of genetic dissimilarity analyses resulted in 36 different groups. The clustering strategy, by which dissimilarity between accessions calculated using SED (quantitative descriptors) and WED (qualitative descriptors) is the most suitable for integrating quantitative and qualitative descriptors in genetic diversity studies of watermelon germplasm.

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Section: Methodsunclassified

“…As características avaliadas foram: produtividade total de frutos (PROD em t. ha -1 ); massa média de frutos em kg fruto -1 (MMF); formato do fruto (FORM) conforme Silva et al (2006); espessura da casca em milímetros (EC); sólidos solúveis (°BRIX); firmeza da casca em Newton (FC); firmeza da polpa em Newton (FP). Avaliou-se também a coloração da polpa (CP) conforme a escala de notas, sendo: 1 -vermelha, 2rosa-intenso, 3 -rosa-médio, 4 -rosa-claro e 5 -branca; e coloração externa do fruto (CEF) conforme escala de nota, em que: 1 -verde-escuro, 2 -verde-médio, 3verde-claro e 4 -amarelo, sendo o padrão de listras da casca (PLC) obtido segundo escala de notas, conforme metodologia proposta por Silva et al (2006), em que: 1 -sem listras, 2 -listra larga, 3 -listra estreita e 4 -mosqueado. Procedeu-se à análise de variância para cada um dos caracteres avaliados para o delineamento experimental do tipo blocos casualizados, conforme modelo estatístico: Yij = m + bj + ti + eij, em que: Yij: é o valor observado do tratamento i (i = 1, 2, ...,81), no bloco j (j = 1, 2, 3); m: é a constante inerente a todas as observações; bj: é o efeito do bloco j; ti: é o efeito do tratamento i; eij: é o erro experimental aleatório associado à observação Yij~ N (0, S 2 e).…”

Section: Methodsunclassified

Heterose Em Híbridos De Melancia

Tavares

Lopes

Alves

et al. 2019

Rev. Agric. Neotrop.

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A melancia é uma curcubitácea bastante difundida no mundo, predominando nos cultivos comerciais o uso de híbridos. Apesar desse cenário, poucos são os trabalhos que relatam a magnitude e efeito da heterose em caracteres de interesse nesta cultura. O objetivo desse trabalho foi estimar a heterose em híbridos de melancia para características agronômicas e qualidade dos frutos. Os tratamentos foram constituídos de 22 genótipos, sendo 15 híbridos experimentais obtidos do cruzamento de seis genitores: quatro cultivares comerciais, duas linhagens experimentais e um híbrido comercial, usado como testemunha. O experimento foi realizado em delineamento de blocos casualizados com três repetições. Os cruzamentos e a análise estatística dos dados foram realizados segundo o modelo Gardner e Eberhart (1966) e adaptados por Miranda Filho e Geraldi (1984). Para heterose padrão, o híbrido Crimson Sweet® (Tecnoseed) x WMX-001G-14-02-55-01pl#09 manifestou heterose positiva para a maioria das características. Para teores de açúcares, o maior percentual de heterose positiva foi encontrado no híbrido Crimson Sweet® (Hollar) x WMX-001G-14-02-55-01pl#08. A melhor combinação híbrida para produtividade e firmeza da casca foi obtida nos cruzamentos com as linhagens experimentais WMX-001G-14-02-55-01pl#08 e WMX-001G-14-02-55-01pl#09.

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Caracterização morfológica e molecular de acessos de melancia

Abstract: Morphological and molecular characterization of watermelonAccessions from the Watermelon Germplasm Bank collected in three different regions of the state of Bahia were characterized using morphological and molecular descriptors. The cultivar Crimson

Cited by 17 publications

References 4 publications

Genetic variability of watermelon accessions based on microsatellite markers

Genetic variability of watermelon accessions based on microsatellite markers

Integration of quantitative and qualitative descriptors for genetic diversity studies of watermelon accessions

Heterose Em Híbridos De Melancia

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