Colchicine at various concentration was given to the apical buds of maize (Zea mays L.). Plants, in order to induce tetraploidy for meiotic studies. Highly irregular meiosis in the C 1 generation was revealed. These meiotic abnormalities increased pollen sterility which lead to a lower seed setting. In the C 2 generation the occurrence of bivalents has increased and that of multivalents has decreased. Restoration of meiotic regularities, pollen fertility.

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