Origin and Meiotic Behaviour of Two Multiple Interchange Trisomics in Pearl Millet (Pennisetum americanum L. Leeke)

Abstract

Two multiple interchange trisomics one involving all the fifteen chromosomes and other at least seven chromosomes were isolated in the progeny of two tertiary interchange trisomics of pearl millet (Penninsetum americanum (2n=14)). The study of chromosome association of diakinesis in these multiple interchanges showed varying frequencies and type of multivalent formations followed by abnormalities in later stages of meiosis. Secondary association of bivalents was quite frequent in one of the interchange. Aneuploidy together with translocation as the probable cause of further chromosome interchanges has been discussed on the light of the present investigation.