Induced Autotetraploidy in Ageratum conyzoides L

Abstract

Polyploidy was induced in A. conyzoides plants with 0.25% aqueous colchicine solution. Autotetraploid plants were dwarf, with more number of branches. Leaves were smaller and thicker. Increase in the size of stomata and pollen grain was observed. Pollen and seed sterility also increased. Expected number of quadrivalents were never observed. Meiotic studies confirmed the induction of polyploidy in the plant.