TRIPLOID × DIPLOID PROGENIES AND THE PRIMARY TRISOMICS OF ANTIRRHINUM MAJUS

Abstract

Four progenies (582 plants) from triploid x diploid crosses of snapdragons (n = 8) consisted of diploids (47.1%), trisomics (39.3%) and other types (13.6%). Classification of the progenies into the three groups was based on external morphology, together with chromosome studies on representative plants. Eight morphologically distinct primary trisomics were obtained and described. The unique phenotype of each trisomic type, together with the deficiency of higher aneuploids in the progenies, were attributed to a lack of genic balance in each chromosome of A. majus.