Meiotic behavior of a new tetraploid cytotype of Brazilian nightshade from Mount Abu, Rajasthan, India

摘要

The present study provides details of male meiosis on a population basis in Solanum seaforthianum Andrews of family Solanaceae from Mount Abu (Rajasthan). In total five populations are worked out from different localities of Mount Abu. Three accessions are reported at diploid level (n = 12) and two populations at tetraploid level (n = 24). The tetraploid cytotype is a new chromosome addition for the species worldwide. The tetraploid cytotype shows abnormal spindle behavior leading to the formation of unoriented bivalents, scattered chromosomes at anaphases and telophases, multipolarity, laggards and irregular microsporogenesis and high pollen sterility. Morphologically the two cytotypes are identical and do not show any significant difference.