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Revista Ceres

Print version ISSN 0034-737X

Abstract

RIGON, João Paulo Gonsiorkiewicz et al. Genetic diversity and path analysis of soybeans cultivars evaluated by means of quantitative  descriptors . Rev. Ceres [online]. 2012, vol.59, n.2, pp. 233-240. ISSN 0034-737X.  http://dx.doi.org/10.1590/S0034-737X2012000200012.

In addition to the evaluations among genotypes, the use of multivariate techniques enables to restrict errors, mainly concerning genetic diversity, and therefore to predict combinations with greater heterotic effect, and the greater possibility of recovery of superior genotypes. The objective of this study was to evaluate the genetic divergence between 18 soybean cultivars based on six morphological characteristics. Path analysis was performed to verify the contribution of direct and indirect characters on grain yield. The Mahalanobis distance has founded techniques of both Tocher Method and dendrogram by Single Linkage. Five different groups were formed: with nine genotypes considered similar among them; while the cultivars CEP 59, Netuno and Urano formed groups isolated by the two grouping methods. The path analysis showed that the indirect characters had little influence on grain yield, with significant direct relationship with mass of 100 grain, and cultivars Tertulha and CEP 53 standing out with grain yields above 3.7 t.ha-1.

Keywords : group; Glycine max L. Merrill; genetic divergence.

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