Abstract
Mitotic karyotype structure, meiotic behavior, pollen characteristics and seed setting of six species of genus Setaria were investigated in six species of Setaria L. Setaria verticillata, S. italica, S.viridis and S. glauca were found diploid(2n = 18) and S. sphacelata and S. plaicatilis are tetarploids ( 2n = 36 ). Karyotype measurements of the diploid species, to some extent, reflect their genetic stability except S. italica. This species has the longest chromosomes among the investigated species with degree of variation between chromosomes. A degree of variation was also observed in the karyotype of tetraploids. Irregular meiosis, chain trivalents and univalents were observed in S. italica and S. sphacelata. Other diploid species show regular meiosis. Tetraploids show various types of meiotic chromosome associations. Tetraploids also showed large pollen compared with diploids. Pollen fertility and seed setting of dipliod species are higher compared to that recorded for tetraploids.
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