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GIEMSA C‐BANDED KARYOTYPES OF SEVEN NORTH AMERICAN SPECIES OF ALLIUM
Author(s) -
Cai Q.,
Chinnappa C. C.
Publication year - 1987
Publication title -
american journal of botany
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.218
H-Index - 151
eISSN - 1537-2197
pISSN - 0002-9122
DOI - 10.1002/j.1537-2197.1987.tb08719.x
Subject(s) - biology , secondary constriction , karyotype , heterochromatin , giemsa stain , allium , ploidy , population , botany , chromosome , b chromosome , cytotaxonomy , constitutive heterochromatin , zoology , genetics , demography , sociology , gene
The karyotypes of seven North American Allium species were studied by Giemsa C‐banding technique. Two species ( A. shoenoprasum and A. tricoccum ) were diploids with 2 n = 16 chromosomes. Three species ( A. cernuum, A. douglasii and A. geyeri ) were also diploids but with 2 n = 14 chromsomes. Diploid and tetraploid populations of A. textile (2 n = 14, 28) were studied. The population of A. canadense studied here was a tetraploid (2 n = 28). All these North American species, except A. geyeri , possessed centromeric bands in all their chromosomes and nucleolar constriction bands in their satellited chromosomes. Allium shoenoprasum contained telomeric bands in most of its chromosomes but the other species had them only in a small number of chromsomes. Only three species ( A. shoenoprasum, A. textile and A. tricoccum ) were found to have intercalary bands in some chromosomes. The heterochromatin distribution in B chromosomes of three species was also observed. In A. cernuum , the heterochromatin occupied most of the length of all its Bs, but in A. shoenoprasum , heterochromatin was concentrated in the centromeric region. One population of A. textile (CC1179) was found to have a B chromosome in which very little heterochromatin existed.