Euchlaena perennis Hitch. X Zea mays L. A cytogenetic interpretation of its fertility
Boggiatto, A.J.; Andrada, A.B.; Zamudio, A.M.P. de
Revista Agronomica del Noroeste Argentino 16(1/4): 75-88
The F1 plants from this cross were normally infertile allotriploids, with 2n = 30, and displayed abnormalities in meiosis, odd chromosome associations (I and III) in metaphase I being very numerous. In their vegetative characteristics, these plants closely resembled E. perennis. The rare setting of fertile seed by F1 plants was attributed to the occasional fertilization of a normal (n = 20) E. perennis gamete by an unreduced n = 20 maize gamete. The fact that all F3, F8 and F9 plants analysed had a somatic chromosome number of 2n = 40 tended to support this hypothesis. In habit and vegetative behaviour, some resembled maize and others teosinte, while some were intermediate. In these advanced generations, a low though persistent incidence of four-chromosome associations in metaphase I indicated some degree of homology between chromosomes of the Zea and Euchlaena genomes.