Descritores quantitativos na estimativa da divergência genética entre genótipos de mamoneira utilizando análises multivariadas

Neto, Francisco Valdevino Bezerra; Leal, Nilton Rocha; Gonçalves, Leandro Simões Azeredo; Filho, L. de M. Rego; Júnior, Antônio Teixeira do Amaral

doi:10.1590/s1806-66902010000200018

Cited by 20 publications

(10 citation statements)

References 12 publications

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“…Groups % de accession allocation often show similar clusters, as in the work by Neitzke et al [14], who assessed the genetic diversity of melons, and the study by Neto et al [15], who evaluated the genetic divergence in castor bean using quantitative descriptors.…”

Section: Accessionsmentioning

confidence: 84%

Genetic Divergence in Mango and Obtaining Minimum Efficient Descriptors

Preisigke¹,

Campos²,

Souza³

et al. 2013

AJPS

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Mangifera indica (mango) is a typically tropical fruit with considerable economic value. Brazil features a wide variety of cultivars of this fruit, most of which are known under several different names. Indeed, the nomenclature of mango varieties is still quite confusing. Up to now there has been no well-defined scientific principle to differentiate them. The objective of the present work is to compare the different clustering methods in assessing genetic divergence among mango accessions, as well as identify the minimum efficient descriptors for that crop. A total of 20 mango accessions in Cáceres, Mato Grosso state, Brazil were evaluated. When building dissimilarity matrices, the descriptors were divided according to the following groups: leaf, flower/inflorescence, fruit, seed and growth habit/ripening period. With these divisions, combinations were performed among the groups of descriptors. The similarity index was used to obtain the dissimilarity matrices. Later, the accessions were clustered using the methods of Tocher, Ward and UPGMA. The study observed that it was possible to reduce the number of descriptors from 64 to 35, and that the clustering methods were compatible with the study of the genetic diversity of mango.

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Section: Accessionsmentioning

confidence: 84%

Genetic Divergence in Mango and Obtaining Minimum Efficient Descriptors

Preisigke¹,

Campos²,

Souza³

et al. 2013

AJPS

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“…Thus, morphological characterization provides a set of data on the genetic variability of materials (GUIMARÃES et al, 2007). This is essential for genetic breeding programs because it identifies combinations that may result in high heterosis, and enhances variability when crossing different genotypes, which raises the prospect of selecting superior segregants (BEZERRA NETO et al, 2010). In the cultivar protection stage, wherein the breeder submits the new plant variety Instability of the expression of morphological and phenological descriptors to environmental variation in white oat for protection by government agencies, the list of descriptors should be submitted along with the material in question to prove its distinctness.…”

Section: Introductionmentioning

confidence: 99%

Instability of the expression of morphological and phenological descriptors to environmental variation in white oat

Santos

Scheffer-Basso

Lângaro

et al. 2017

SCA

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Morphological and phenological characters are used in the selection, breeding, and description of plant varieties with varying genotypes. The stability of these descriptors in the face of environmental changes can determine their usefulness in situations where plant varieties must be reliably identified. The objective of this study was to verify the expression of morphological and phenological descriptors and use them to distinguish between white oat cultivars (Avena sativa L.) in two growing periods. For this, five cultivars, protected and belonging to four breeders, referred to as G1, G2, G3, G4, and G5, were sown in the typical growing season in southern Brazil (autumn-winter) and outside that period (winter-spring), and grown for forty days. The experiment was established in the field, in a randomized block design replicated three times. The cultivars were evaluated for 42 descriptors (15 quantitative and 27 qualitative). Quantitative data were analyzed by analysis of variance, the comparison of averages, and multivariate analysis by generating average euclidean distances. Qualitative data were analyzed by mode determination, followed by obtaining the similarity index. The relationship between cultivars was illustrated by dendrograms. The stability index for each descriptor was calculated. A genotype x environment interaction was observed for 28 descriptors. The stability of descriptor appearance and persistence over the growing season was higher in qualitative (44%) than in quantitative (7%) descriptors. The most stable qualitative descriptors were lemma color, hairiness of the upper node, flag leaf position, hairiness of the base of the grain, basal grain length, and rachilla length. The most stable quantitative descriptor was flag leaf length. Shifting the white oat growing season from autumn-winter to winter-spring reduced the cycle and modified the expression of most descriptors by changing the phenotypic distinctness between cultivars. Key words: Avena sativa L. Genotype x environment interaction. Morphology. Phenology. ResumoCaracteres morfológicos e fenológicos são utilizados na seleção, cruzamentos e descrição de genótipos, sua instabilidade frente a alterações ambientais pode determinar o seu valor na etapa de proteção de cultivares. Este trabalho foi desenvolvido com o objetivo de verificar a expressão de descritores morfológicos e fenológicos e, consequentemente, a dissimilaridade entre cultivares de aveia-branca (Avena sativa L.) em dois períodos de cultivo. Para isso, cinco cultivares, protegidas e oriundas de quatro obtentores e, aqui, codificadas (G1, G2, G3, G4 e G5), foram semeadas dentro do período recomendado para a cultura no sul do do Brasil (outono-hibernal) e fora desse período (hiberno-primaveril), com intervalo de quarenta dias. O experimento foi estabelecido em campo, em blocos casualizados, com três repetições. As cultivares foram avaliadas quanto a 42 descritores (15 quantitativos e 27 qualitativos). Os dados quantitativos foram submetidos à análise de variância, seguida ...

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“…Estudos de divergência genética vegetal são frequentemente realizados com base em descritores botânicos, morfológicos e agronômicos, por apresentarem baixos custos e fácil obtenção (Vargas & Blanco 2000, Oliveira et al 2007, Bezerra Neto et al 2010. Estas análises permitem identificar combinações genéticas que resultem em maior efeito heterótico, de forma a aumentar a possibilidade de obtenção de descendentes com características superiores (Cruz et al 2004), as quais são reveladas por meio da caracterização morfoagronômica (Sudré et al 2005).…”

Section: Key-wordsunclassified

Divergência genética de populações de Piper hispidinervum C. DC. com base em caracteres morfoagronômicos

Negreiros

Miqueloni

2013

Pesqui. Agropecu. Trop.

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Com o intuito de gerar informações para o programa de melhoramento de pimenta longa (Piper hispidinervum), no Estado do Acre, avaliou-se a divergência genética entre quinze populações coletadas em diferentes regiões do Estado. Foram avaliados os seguintes caracteres morfoagronômicos: largura e comprimento da folha, comprimento e diâmetro do pecíolo, volume de copa, rendimento de óleo essencial e teor de safrol (componente majoritário deste óleo essencial). Foram aplicadas análises de agrupamento, pelos métodos de otimização de Tocher e do vizinho mais próximo, além da análise de variáveis canônicas. Houve diferenças significativas em todas as características estudadas. O agrupamento pelo método de Tocher permitiu identificar três grupos de divergência. As três primeiras variáveis canônicas explicaram 76% da variância original dos dados, resultando em quatro grupos, que corroboraram, em grande parte, os resultados da análise anterior. As duas variáveis de maior importância, na discriminação dos grupos, foram o teor de safrol e o rendimento de óleo essencial, que se mostraram básicos, para a seleção de genótipos superiores. Os grupos de similaridade ou de divergência permitiram identificar populações com características de interesse para programas de melhoramento da espécie.

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Descritores quantitativos na estimativa da divergência genética entre genótipos de mamoneira utilizando análises multivariadas

Cited by 20 publications

References 12 publications

Genetic Divergence in Mango and Obtaining Minimum Efficient Descriptors

Genetic Divergence in Mango and Obtaining Minimum Efficient Descriptors

Instability of the expression of morphological and phenological descriptors to environmental variation in white oat

Divergência genética de populações de Piper hispidinervum C. DC. com base em caracteres morfoagronômicos

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