Meiosis and embryo sac development in Urochloa mosambicenisis and three Paspalum species

Abstract

Paspalum commersonii is tetraploid and sexual. Urochloa mosambicensis, Paspalum plicatulum, and P. guenoarum are all tetraploid aposporous apomicts. The aposporous embryo sac is four-nucleate in U. mosambicensis and eight-nucleate in the Paspalum spp. Irregularities in chromosome pairing occurred at meiosis in all species except P. commersonii.