Abstract
SUMMARYA cytological study of progenies of amphiploid of P. typhoides × P. purpureum having pollen fertility ranging from 0 to 84 per cent has been made. It was found that meiotic disturbances did not correspond to the extent of pollen sterility and the plants showing less meiotic disturbances showed higher percentage of sterility than the plants with high disturbances. The wide range of variation of pollen fertility in the progenies inspite of the chromosome constancy and fairly high degree of the meiotic stability points to the operation of genic factors controlling fertility. The role of cryptic structural hybridity in influencing the fertility-sterility of the progenies has also been considered. It could be said that the sterility in amphiploid progenies is independent of the segregation for other morphological characters and also independent of genomic influence. The structural homology of the A and A' genomes of P. typhoides and P. purpureum was confirmed. The members of A and A' genome are largely undifferentiated in nature. The high meiotic stability of the hexaploid progenies coupled with genie segregation is a welcome situation in the use of the raw allopolyploid in breeding programmes.
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