Variation of the frecuency of multivalens in Zea diploperennis x Z. perennis (2n=30 and 2n=40) hybrids treated with diluted concentrations of colchicine

NARANJO, CA; POGGIO, L; MOLINA, MC Y BERNATENÉ, EA.

Maize Genetics Cooperation Newsletter

University of Illinois

Lugar: Illinois; Año: 1991 vol. 65 p. 74 - 75

1090-4573

Having managed inmature panicles with colchicine (0.5 x 10-4M) for 12 hours, we have shown the existence of cryptic homoeology in maiza (Z. mays ssp. mays) and Z. perennis, forming quadrivalents in the first one and increasing the frequency of quadrivalents in the second one (Poggio L et al., Theor. Appl. Genet. 79:461-464, 1990). These results confirm the allotetraploid nature of maize proposed by Molina and Naranjo (Theor. Appl. Genet. 73:542, 1987) and Narajo and Molina (MNL 61:62) and suggest that the species have homoeologous genomes. To complete the analysis of genome relationships we have analyzed two artificial hybrids, Z. diploperennis x Z. perennis, 2n=30 and 2n=40. The results pointed out greater homoeology among B and C genomes with respect to the untreated material and not between these genomes and the A shown by the absence of hexavalents and octovalents in the 2n=30 and 2n=40 taxa (MNL 62:74-75).