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Cold‐induced Chromosome Regions and Karyosystematics in Sambucus and Viburnum
Author(s) -
BenkoIseppon Ana Maria,
Morawetz W.
Publication year - 1993
Publication title -
botanica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.871
H-Index - 87
eISSN - 1438-8677
pISSN - 0932-8629
DOI - 10.1111/j.1438-8677.1993.tb00355.x
Subject(s) - caprifoliaceae , viburnum , biology , botany , chromosome , genetics , gene
The genera Viburnum, Sambucus and Lonicera have been investigated for chromosome number and karyomorphology including Giemsa‐C‐banding, fluorochrome (DAPI/CMA) banding and cold treatment. Cold‐induced undercontracted chromosome regions (CIRs) are found in Viburnum and Sambucus for the first time and are apparently identical with larger hc regions, shown by Giemsa C‐banding. Certain narrow C‐bands are not cold‐sensitive. CIRs frequently react brightly CMA‐positive in Viburnum and Sambucus , while DAPI fluorescence is virtually ineffective. The occurrence of CIRs within plants is possibly linked to certain nuclear characters such as large chromosomes and continuous condensation behaviour. Cold‐induction has possibly also some influence on euchromatin condensation characteristics in prophasic chromosomes. Several karyological characters point to a closer relationship between Viburnum, Sambucus and Adoxa : Relatively large chromosomes, continuous condensation behaviour, reticulate to semireticulate interphase nuclei and presence of CIRs. These genera appear isolated from Lonicera and the Caprifoliaceae s.str., which differ remarkably in karyomorphology.