Identification of promising wheat genotypes for crossing

The objective of this study was to identify promising wheat genotypes from the IAPAR breeding program for crosses by multivariate techniques. Measures of dissimilarity between genotypes were obtained from multicategoric variables. To identify clusters, Tocher optimization and UPGMA were used. The ge...

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Veröffentlicht in:Crop breeding and applied biotechnology 2011-03, Vol.11 (1), p.82-87
Hauptverfasser: Costa, Luciana, Riede, Carlos Roberto, Zucareli, Claudemir, Pípolo, Valéria Carpentieri, Garbuglio, Deoclécio Domingos
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Sprache:eng
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Zusammenfassung:The objective of this study was to identify promising wheat genotypes from the IAPAR breeding program for crosses by multivariate techniques. Measures of dissimilarity between genotypes were obtained from multicategoric variables. To identify clusters, Tocher optimization and UPGMA were used. The genotypes were divided into five diverging groups, indicating a wide genetic base of the wheat breeding program of the Agricultural Research Institute of Paraná (IAPAR). As indicated by the genetic distance, crosses involving the cultivars IPR 85 and IPR 118 seem to be the most promising to increase genetic gains in both grain and flour quality as well as for agronomic parameters. O objetivo do trabalho foi identificar genótipos de trigo, provenientes do Programa de Melhoramento Genético do IAPAR, promissores para cruzamentos, por meio de técnicas multivariadas. As medidas de dissimilaridade entre os genótipos foram obtidas a partir de variáveis multicategóricas. Para identificação dos agrupamentos foi utilizado o método de otimização de Tocher e o hierárquico UPGMA. Os genótipos avaliados foram alocados em cinco grupos divergentes, indicando que a base genética do programa de melhoramento de trigo do IAPAR é ampla. Com base na distância genética, cruzamentos artificiais envolvendo as cultivares IPR 85 e IPR 118 podem ser os mais promissores no intuito de incrementar o ganho genético, tanto para a qualidade de grãos e de farinha quanto para parâmetros agronômicos.
ISSN:1984-7033
1518-7853
1984-7033
DOI:10.1590/S1984-70332011000100012