A new record of chromosome count in mixoploid karyotype of Strobilanthes hamiltoniana (Steud.) Bosser & Heine (Acanthaceae)

Abstract

The mixoploid karyotype found in the garden plant, Strobilanthes hamiltoniana, is a new record of chromosome count to the contemporary knowledge. The detailed karyomorphometrical analysis of the plant revealed a symmetric karyotype which is primitive. A hypoploid variant along with the normal chromosome complement was recorded within a root meristem with karyotype formulae as 10 nm and 20 nm respectively. In the diploid cells two pair of chromosomes have secondary constriction with an average chromosome length of 1.81 μm. The high values of symmetric indices and low values of asymmetric indices proved the primitive nature of the karyotype.