Nucleotide Composition of the Cold-Sensitive Heterochromatic Regions in Paris hainanensis Merrill

Cold-induced decondensation of heterochromatic regions (CSR-bands) in Paris hainanensis(=Daiswa hainanensisMerrill Takht.) (2n= 10; 10 + b) was studied. The comparison of CSR-banding patterns with those obtained by nucleotide-specific staining with fluorochromes DAPI and chromomycin A₃demonstrated that low temperatures induced decondensation only of large AT-rich heterochromatic regions. It is suggested that this is characteristic of all plant species.