Adaptabilidade e estabilidade em genótipos apomíticos do gênero Paspalum

Pereira, Érico Felden; Dall'Agnol, Miguel; Schneider, Raquel de Almeida; Weiler, Roberto Luis; Kuhn, N.; Simioni, Carine; Mazurkievicz, Gustavo; Silva, José Antônio Gonzalez da

doi:10.1590/0103-8478cr20130102

Cited by 4 publications

(4 citation statements)

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“…Produção de matéria seca total (g linha -1 ) de genótipos de Paspalum e P. maximum cv. Aruana, em dois anos e locais de forma diferente, conforme a variação das condições edafoclimáticas de cada ambiente (Pereira et al, 2015b). Esses autores observaram que os ecótipos de P. guenoarum Azulão e Baio mostram alta produção de biomassa, porém, ajustados a ambientes favoráveis e com reduzida estabilidade fenotípica.…”

Section: Resultsunclassified

Variabilidade agronômica e seleção de progênies F1 de Paspalum

Huber¹,

Dall'Agnol

Motta

et al. 2016

Agraria

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RESUMOO objetivo deste estudo foi avaliar o desempenho forrageiro e estimar as correlações fenotípicas de caracteres agronômicos de híbridos interespecíficos de Paspalum, em duas regiões fisiográficas distintas. Avaliaram-se 20 híbridos, dois ecótipos de P. guenoarum, um de P. plicatulum e a cv. Aruana de Panicum maximum, utilizada como testemunha. O delineamento foi em blocos ao acaso, com três repetições. Os caracteres mensurados foram: produção de matéria seca total, produção de matéria seca de folhas, produção de matéria seca de colmos, produção de matéria seca de inflorescência, relação folha: colmo, altura, diâmetro de cobertura das plantas e numero de perfilhos. Os híbridos 10E4026, 10E5052, 08Q01, 10E43, 10E40104, 10E6086, 10E4025, 10E5017, 10E4041, 10E4071 e 10E31 apresentaram desempenho forrageiro superior nos dois ambientes, e são indicados para novas etapas dentro de programas de melhoramento de forrageiras. A alta correlação positiva entre a massa seca de folha com a massa seca total, diâmetro de cobertura das plantas e altura, torna a estimativa das correlações fenotípicas uma importante ferramenta na seleção de híbridos com caracteres agronômicos superiores. Palavras-chave: ambiente, apomixia, hibridação, melhoramento genético ABSTRACTThe objective of this study was to evaluate the forage performance and estimate the correlations of agronomic traits of interspecific hybrids of Paspalum in two distinct physiographic regions. They evaluated 20 hybrids, two ecotypes of P. guenoarum, one P. plicatulum and cv. Aruana of Panicum maximum, used as a control. The design was a randomized block design with three replications. The traits measured were: total dry matter yield, leaf dry matter yield, stem dry matter yield, inflorescence dry matter yield, leaf: stem ratio, height, plant coverage diameter and number of tillers. The hybrids 10E4026, 10E5052, 08Q01, 10E43, 10E40104, 10E6086, 10E4025, 10E5017, 10E4041, 10E4071 and 10E31 showed higher forage performance in both environments and are suitable for new steps in forage breeding programs. The high positive correlation between the leaf dry mass with the total dry mass, plant coverage diameter and height, makes the estimation of correlations an important tool in selecting hybrids with superior agronomic traits.

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Section: Resultsunclassified

Variabilidade agronômica e seleção de progênies F1 de Paspalum

Huber¹,

Dall'Agnol

Motta

et al. 2016

Agraria

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“…The development of new cultivars in Paspalum has been focused on identifying genotypes with high forage production, using sexual parents to generate genetic variability. In addition, these materials have been characterized in relation to their genetics and morphology (Dahmer et al, 2008;Fachinetto et al, 2012;Pereira et al, 2012;Pereira et al 2015). Subsequently, these materials are subjected to intra or interspecific crosses, using duplicate diploid sex plants as the female parent (Huber et al, 2016;Machado et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Genetic diversity of a Paspalum notatum Flügge germplasm collection

et al. 2017

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The objective of this study was to assess the genetic diversity among accessions of Paspalum notatum based on morphological marker traits and identify those morphological traits that contribute most to the variability among accessions. Fifty-three accessions were evaluated for the following traits: length, width, color, and pubescence of sheath; length, width, insertion angle, color of midrib, and pubescence of leaves; number, length, and angle of racemes; length of flowering stems; and plant growth habit (erect or prostrate). Multivariate analysis of the quantitative morphological data based on the Mahalanobis distance and UPGMA method grouped the accessions into 19 heterogeneous clusters. The relative contribution of each trait to cluster formation was obtained using the Singh method. Qualitative morphological traits were used to construct a dendrogram based on Jaccard's similarity, generating 13 clusters. Based on the morphological traits investigated, there is high genetic variation among accessions of P. notatum, demonstrating that these accessions have a good potential for a breeding program. Length of racemes, width of sheath, length of flowering stems, and length of leaves were found to contribute most to the variability among accessions. A number of traits contributed to a lesser degree. The set of characters used are representative of the vast phenotypic plasticity observed in P. notatum, a diversity which is likely to be related to the species apomictic form of reproduction and the origin of the accessions.

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“…In perennial species, the year of planting is a period of adaptation in relation to initial establishment (Pereira et al, 2015). In subsequent years, after perennialization, photoassimilates are targeted towards the expression of agronomic traits, making it easier to identify the differences between genotypes (Pereira et al, 2011).…”

Section: Resultsmentioning

confidence: 99%

Genetic variability of the components of seed yield in interspecific hybrids of Paspalum

et al. 2017

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-This study aimed to determine the variability and expression of the components of seed yield in twenty-three apomictic Paspalum plicatulum × Paspalum lepton hybrids and two male parent plants (P. lepton). We used a randomized block design with genotypes individually arranged into ten blocks. The variables were: number of total tillers/plant, number of vegetative tillers/plant, number of reproductive tillers/plant, percentage of reproductive tillers, number of racemes/inflorescence, number of seeds/inflorescence, weight of a thousand seeds, and seed yield. We assessed genetic variability using multivariate procedures: generalized Mahalanobis distance, Tocher's clustering optimization method, and quantification of the relative contribution of the variables. The quantification of variability, based on the components of seed yield of Paspalum plicatulum × Paspalum lepton hybrids, allows the formation of six groups of genotypes using Tocher's method, with high means for the characteristics studied. Weight of a thousand seeds and number of seeds/inflorescence were the traits that most contributed to the genetic dissimilarity. Genetic crosses involving genotype 10E5052 from group VI and 10E4071 from group V could be undertaken to isolate high yielding segregants, since these genotypes have high seed yielding potential.Key Words: apomitic genotypes, Plicatula, seed production, weight of thousand seeds Revista Brasileira de Zootecnia

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Adaptabilidade e estabilidade em genótipos apomíticos do gênero Paspalum

Abstract: RESUMO O objetivo do trabalho foi analisar a adaptabilidade e estabilidade de genótipos apomíticos do gênero

Cited by 4 publications

References 13 publications

Variabilidade agronômica e seleção de progênies F1 de Paspalum

Variabilidade agronômica e seleção de progênies F1 de Paspalum

Genetic diversity of a Paspalum notatum Flügge germplasm collection

Genetic variability of the components of seed yield in interspecific hybrids of Paspalum

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