Cytogenetic Studies on Diploid and Induced Tetra-Ploids of Brown Sarson*
Abstract
Golchicine-induced autotetraploid seeds of four strains of Brassica campestris L. var. brown sarson were grown in C3 generation and a comparative cytologi-cal study made between tetraploid and diploid plants. The tetraploids showed multivalent associations, presence of univalents, chromatin bridges due to delayed terminalization (stickiness), laggards, precocious movement of chromosomes and unequal distribution. The quadrivalents were of the ring or chain type.
Unsuccessful development of siliquae and lower seed setting in crossing and selfing of autotetraploid strains as compared to diploid strains was observed perhaps due to meiotic irregularities and other factors like incompatibility. Parthenocarpic development of siliquae was, however, observed.
