Studies on Cytogenetics of Some Species in Genus Urochloa L

Abstract

Detailed microsporogenesis of 4 species of Urochloa namely U. pullulans, U. stolonifera, U. moschambicensis and U. setigera is carried out. Critical nature of chromosome pairing is studied and pairing is found regular in allotetraploids. Some multivalent formation is noticed in segmental allotetraploids. Aberrant meiosis in the material is evaluated. The basic chromosome number of the genus and role played by polyploidy, apomixis and hybridization in the evolution of the genus are discussed.