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Cytogenetic studies in the genus Zea : 2. Colchicine-induced multivalents
L Poggio1, M C Molina, C A Naranjo
1Instituto Fitotécnica de Santa Catalina, C.C.4, 1836, Llavallol, Buenos Aires, Argentina.
Abstract:
Premeiotic colchicine treatment brings about the production of one to five quadrivalents in Zea mays ssp. mays (maize, 2n=20) and an increase in the number of quadrivalents from five to ten in Zea perennis (2n=40). The results confirm the allotetraploid nature of maize and suggest that the species possesses two homoeologous genomes (A2A2 B2B2) that fail to pair, probably due to the presence of Ph-like genes. Moreover, the autoallooctoploid nature of Zea perennis, with a genome formula A'1A'1 A″1A″1 C1C1 C2C2, is supported by the present results.
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