Cytogenetics, Embryology, and Stem Anatomy of a Cassava Interspecific Hybrid

Abstract

Summary Cytogenetical analysis of the interspecific hybrid between M. esculenta (cassava) and M. oligantha revealed a fair chromosome pairing and a high viability of pollen grain. Studying ovule structure by clearing method showed multiembryony in 2.7% of ovules studied. Doubling chromosome number resulted in an increase of multiembryony up to 18% and reduction of pollen viability. Multivalent formation was observed too. In anatomical stem study of diploid and tetraploid hybrids it was noted larger number of vascular bundles in tetraploid type.