Further studies of the hybrids, Paraixeris denticulata×Lactuca squarrosa
1958 Volume 33 Issue 5 Pages 155-162
Details
1958 Volume 33 Issue 5 Pages 155-162
The hybrid between Paraixeris denticulata (n=5) and Lactuca squarrosa (n=9) is composed of cells with different numbers of chromosomes, which are smaller than the expected 14. In the hybrid hitherto reported, a single karyotype with 12 chromosomes was predominant.
A further investigation was carried out with the parental plants of different origin. The results are somewhat different from the former hybrids.
The mosaic condition with different karyotypes is also observed in the present hybrids. But karyotypes with 10 chromosomes seem to be predominant over the others in much less extent than in the former hybrids.
Better mitotic plates are obtained when plants are germinated in a sterilized agar culture medium than on filter paper or in soil.
Cold treatment of plants (0°C, 3-5 days) reveals some patterns of the chromosomes, which make the identification of an individual chromosome more easy.
