PHYSICAL AND GENETIC-MAPPING OF RDNA SITES IN PENNISETUM (PEARL-MILLET)

Two pairs of rDNA sites, with significantly different signal strength, were detected on two pairs of chromosomes of Pennisetum glaucum and P . violaceum. Both sites were physically located at the distal ends of the short arms of these two chromosome pairs, with the major pair bein g located on the two shortest chromosomes. Restriction fragment length polymorphism (RFLP) analysis enabled one of the two pairs of rDNA sit es, designated Nor-P1, to be mapped on the fifth linkage group in Penn isetum.