1996 Volume 61 Issue 3 Pages 321-325
A comparative study of the cold-sensitive segment and C-banded segments of chromosomes was made in Paris tetraphylla (2n = 2x = 10). The cold-sensitive segment was confined to the distal half of the short arm of chromosome C out of five chromosomes A to E. On the other hand, C-bands were not only found in the cold-sensitive segment but also regions of all chromosomes A to E. Thus, it was elucidated that the heterochromatic regions of this species consist of reactive segments to both cold treatment and C-banding staining and only to C-banding staining. The cold-sensitive segments of Paris tetraphylla chromosomes might be AT-rich constitutive heterochromatin.