Intergeneric Hybrids in the Bothriochloininae

I. Bothriochloa intermedia and Dichanthium annulatum

Abstract

A comparative study of cytology and morphology revealed that the cytologically reduced as well as unreduced gamete of B. intermedia can be fertilized by a normal gamete of D. annulatum to produce viable offspring. The 2n=40 chromosome D. annulatum appears to be a segmental allopolyploid with the chromosomes of the two genomes sufficiently homologous to pair when present in the haploid condition. The 2n=40 chromosome B. intermedia is regarded as a segmental allopolyploid with a number of D. annulatum genes incorporated in the one genome.