Reports

Chromosome Pairing within Genomes in Maize-Tripsacum Hybrids

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Science  27 Feb 1970:
Vol. 167, Issue 3922, pp. 1247-1248
DOI: 10.1126/science.167.3922.1247

Abstract

When the ten chromosomes of maize were inserted inlto a polyploid (2n = 72) Tripsacum dactyloides background they formed up to five pairs at meiosis. Two plants that each contained 36 Tripsacum and 14 maize chromosomes were deprived from the F1 of maize x Tripsacum. Chromo. somes of these plants frequently formed 25 bivalents, 18 between Tripsacum chromosomes and seven between maize chromosomes. Maize chromosomes could be distinguished from Tripsacum chromosomes on the basis of size. The withint-genome pairing is probably induced by the genetic background.