Divergência genética entre cultivares de soja, sob condições de várzea irrigada, no sul do estado Tocantins

Almeida, Ricardo Dias de; Pelúzio, Joênes Mucci; Afférri, Flávio Sérgio

doi:10.1590/s1806-66902011000100014

Cited by 62 publications

(78 citation statements)

References 7 publications

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“…Knowledge of associations between traits is of great importance in the breeding of any species, if selecting for one of them presents difficulties due to low heritability or measurement problems . In this case, indirect selection using another trait that has high heritability and is easily evaluated can be recommended, because the trait will be highly correlated with a trait that is difficult to directly select for (Almeida et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Correlations between traits in soybean (Glycine max L.) naturally infected with Asian rust (Phakopsora pachyrhizi)

Rodrigues¹,

Serafim²,

Nogueira³

et al. 2015

Genet. Mol. Res.

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ABSTRACT. Soybean (Glycine max L.)-breeding programs aim to develop cultivars with high grain yields and high tolerance to Asian soybean rust (Phakopsora pachyrhizi). Considering that the traits targeted for breeding are mainly quantitative in nature, knowledge of associations between traits allows the breeder to formulate indirect selection strategies. In this study, we investigated phenotypic, genotypic, and environmental correlations between the agronomic traits of soybean plants naturally infected with P. pachyrhizi, and identified agronomic traits that would be useful in indirectly selecting soybean genotypes for high yields. The study was conducted on the Capim Branco Farm, Uberlândia, Brazil, with 15 soybean genotypes, which were cultivated in a completely randomized block design with four replications. Fourteen phenotypic traits were evaluated using the GENES software. The phenotypic and genotypic correlations were positive and of a high magnitude between the total number of pods and the number of 17718-17729 (2015) pods with two or three grains, indicating that the total number of pods is a useful trait for the indirect selection of soybean genotypes for high grain yields. Strong environmental correlations were found between plant height at blooming and maturity and grain yield and yield components.

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Section: Introductionmentioning

confidence: 99%

Correlations between traits in soybean (Glycine max L.) naturally infected with Asian rust (Phakopsora pachyrhizi)

Rodrigues¹,

Serafim²,

Nogueira³

et al. 2015

Genet. Mol. Res.

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“…A análise multivariada tem sido uma ferramenta muito utilizada em estudos sobre divergência genética, em várias culturas, como milho (DOTTO et al, 2010), girassol (AMORIM et al, 2007;VOGT;BALBINOT JÚNIOR;SOUZA, 2010) e soja (ALMEIDA; PELUZIO; AFFÉRRI, 2011;AZEVEDO et al, 2004;PELUZIO et al, 2010;RIGON et al, 2012;SANTOS et al, 2011).…”

Section: Introductionunclassified

Genetic diversity in advanced soybean strains derived from biparental, four-way and eight-way crosses

Júnior

Unêda-Trevisoli

Espíndola

et al. 2015

Revista Ciência Agronômica

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RESUMO -O objetivo do presente trabalho foi analisar a diversidade genética e o desempenho agronômico de um grupo de linhagens avançadas e superiores de soja, oriundas de cruzamentos biparentais, quádruplos e óctuplos, para identificar futuras combinações superiores e promissoras. O experimento foi conduzido na área experimental da Universidade Estadual Paulista "Júlio de Mesquita Filho", Campus de Jaboticabal, São Paulo. Os caracteres avaliados foram: número de dias para floração, altura da planta na floração, número de dias para maturidade, altura da planta na maturidade, altura de inserção da primeira vagem, número de ramos, número de vagens por planta, valor agronômico, acamamento, peso de cem sementes e produtividade de grãos. Para o cálculo das distâncias fenotípicas foi utilizada a distância generalizada de Mahalanobis e a contribuição relativa de cada caráter. Dentre os genótipos analisados, 19 linhagens obtiveram altos rendimentos, sendo superiores às testemunhas (V-max, CD 216, CD 219 e Conquista). A maior distância encontrada foi entre as linhagens JAB 41 e JAB 17 (279,81), seguidas por JAB 40 e JAB 17 (261,38) e entre JAB 40 e JAB 22 (255,46). Verificou-se a formação de seis grupos pelo agrupamento de Ward, indicando a presença de variabilidade genética entre as linhagens avaliadas. O aumento do número de genitores não foi determinante para o aumento da diversidade genética entre as linhagens, bem como não foi o fator responsável pelo agrupamento ou não dos genótipos avaliados. Palavras-chave:Glycine max. Dissimilaridade. Produtividade. Ward. ABSTRACT -The aim of this study was to analyse the genetic diversity and agronomic performance of a group of advanced and superior strains of soybean, derived from biparental, four-way and eight-way crosses, in order to identify future promising and superior combinations. The experiment was carried out in the experimental area of the Paulista State University, Júlio de Mesquita Filho, Jaboticabal Campus, in the state of São Paulo, Brazil. The characteristics under evaluation were: number of days to flowering, plant height at flowering, number of days to maturity, plant height at maturity, height of the first pod, number of branches, number of pods per plant, agronomic value, lodging, one hundred seed weight and seed yield. , The Mahalanobis distance and the relative contribution of each characteristic were used to calculate the phenotypic distances. Among the genotypes analysed, 19 strains displayed high productivity, being superior to the controls (V-max, CD 216, CD 219 and Conquista). The greatest distance found was between strains JAB 41 and JAB 17 (279.81), followed by JAB 40 and JAB 17 (261.38) and between JAB 40 and JAB 22 (255.46). There were six groups formed using the Ward method, indicating the presence of genetic variability among the tested strains. Increasing the number of parents had no effect on the increase in genetic diversity between the strains, and was not the factor responsible for the grouping or not of the genotypes under test.

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“…The use of morphological characters combined with multivariate techniques has been widely utilized to quantify genetic distance [3], examples of which can be found in such quantifications for crops like pepper [4], cassava [5], soybeans [6], goatweed [7] and turmeric [8].…”

Section: Introductionmentioning

confidence: 99%

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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Divergência genética entre cultivares de soja, sob condições de várzea irrigada, no sul do estado Tocantins

Cited by 62 publications

References 7 publications

Correlations between traits in soybean (Glycine max L.) naturally infected with Asian rust (Phakopsora pachyrhizi)

Correlations between traits in soybean (Glycine max L.) naturally infected with Asian rust (Phakopsora pachyrhizi)

Genetic diversity in advanced soybean strains derived from biparental, four-way and eight-way crosses

Genetic Divergence in Mango and Obtaining Minimum Efficient Descriptors

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