CHROMOSOME LOCALIZATION AND CHARACTERIZATION OF A FAMILY OF LONG INTERSPERSED REPETITIVE DNA ELEMENTS FROM THE GENUS ZEA

This paper describes the characterization and chromosomal distribution of new long repetitive sequences present in all species of the genus Zea. These sequences constitute a family of moderately repetitive elem ents ranging approximately from 1350 to 1700 copies per haploid genome in modern maize (Zea mays ssp. mays) and teosinte (Zea diploperennis) , respectively. The elements are long, probably larger than 9 kb, and they show a highly conserved internal organization among Zea subspecie s and species. The elements are present in all maize chromosomes in an interspersed pattern of distribution, are absent from centromeric and pericentric heterochromatin, and with some clustering in the distal r egions of chromosome arms.