NMU induced translocation and inversion in Phlox drummondii.

Two out of sixty plants raised from the seeds treated with 0.2% NMU were found to be translocation and inversion heterozygotes respectively. The plant showing reciprocal translocation was characterized by the presence of a ring of four chromosomes and five bivalents in the PMCs. Rings were mostly of open type. The plant showing paracentric inversion had one bridge and one fragment at anaphase II in most of the PMCs. Such configuration could only result when two crossovers, one inside and one outside the inversion loop were formed. It is probably the first report where NMU has successfully been used to induce reciprocal translocation and paracentric inversion.