Resumen

PUGH, Tatiana  y  LAYRISSE, Alfredo. Utilizacion de generaciones avanzadas de hibridos simples como progenitores de hibridos dobles de maiz¹. Agronomía Trop. [online]. 2005, vol.55, n.1, pp.102-116. ISSN 0002-192X.

Our objective was to compare conventional double-cross hybrids of corn obtained by crossing two single-cross hybrids with those produced by crossing the advanced generations (F2) of the same single-cross hybrids hybrids with those produced by crossing the advanced generations (F2) of the same single-cross hybrids. The double-cross hybrids tested were PB-8, FM-6, HIMECA 92 and HIMECA Experimental 395.Eight single-cross hybrids, eight advanced generations (F2), four conventional double-cross hybrids, and four non-conventional double-cross hybrids were grown in three locations of Aragua State (Venezuela) in 1994. In 1995 only the four conventional and the four non-conventional double-cross hybrids were tested in two locations of the same state. Plant height, ear height, length and diameter of the ear, and yield were measured. There were always highly significant differences between locations for yield but not for the genotype x environment interaction. The contrast between single-cross hybrids and advanced generations was always highly significant (1994) but there were not differences between conventional and non-conventional double-cross hybrids (1994 and 1995). According to the results it would be advisable the use of advanced generations (F2) as parents of double-cross hybrids, provided that the advance has been made in the absence of forces that modify gene frecuency

Palabras clave : Zea mays L; single-cross hybrids; double-cross hybrids.