Pesquisa Agropecuária Brasileira
Print version ISSN 0100-204X
MIRANDA, Glauco Vieira et al. Potential to breeding and genetic divergence in popcorn cultivars. Pesq. agropec. bras. [online]. 2003, vol.38, n.6, pp. 681-688. ISSN 0100-204X. http://dx.doi.org/10.1590/S0100-204X2003000600003.
The objective of this paper was to evaluate the potential of breeding and genetic divergence in nine tropical popcorn cultivars. The genetic divergence was estimated using multivariate analysis techniques and the cultivars were grouped based in Mahalanobis' generalized distance (MGD), using Tocher's optimization and graphic dispersion. The best cultivars concerning the yield grain above 3 ton/ha were CMS 43, IAC 112, Viçosa, CMS 42 and Branco, and to popping expansion above 24 (v/v) were IAC 112, RS 20 and Zélia. The estimates of MGD indicated the pairs genetically more distant (RS 20, Beija-flor) and (Rosa-claro, RS 20) as well as pairs genetically more similar (IAC 112, Viçosa) and (Branco, CMS 42). Tree or four genetic divergences groups were formed depending on the method. To popcorn breeding, cultivars with best potential are RS 20, Zélia, IAC 112, and Beija-flor. The cultivars show genetic divergence.
Keywords : Zea mays; selection; multivariate analysis; breeding methods.