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A COMPARATIVE STUDY OF MITOSIS IN THE ONAGRACEAE
Author(s) -
Kurabayashi Masataka,
Lewis Harlan,
Raven Peter H.
Publication year - 1962
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.1537-2197.1962.tb15040.x
Subject(s) - biology , prophase , interphase , onagraceae , chromosomal translocation , mitosis , chromosome , genetics , botany , evolutionary biology , meiosis , gene
K urabayashi , M asataka , H arlan L ewis , and P eter H. R aven . (U. California, Los Angeles.) A comparative study of mitosis in the Onagraceae. Amer. Jour. Bot. 49(9): 1003–1026. Illus. 1962. —Mitotic cycles of 46 species of Onagraceae, representing 15 genera and all of the tribes, have been examined and were found to fall into 3 modally distinct groups: (1) the tribes Fuchsieae, Lopezieae, and Circaeae; (2) the Epilobieae and Jussiaeae; (3) the Onagreae and Hauyeae. All species characterized by translocation systems, whether complex heterozygotes or variable frequencies of individual translocations, belong to group 3. Group 1 has no definite chromocenters during interphase and the chromosomes contract more or less evenly along a gradient during prophase. Groups 2 and 3 have definite chromocenters during interphase and the chromosomes become differentiated at early prophase into dense proximal and diffuse distal regions; contraction of the chromosomes does not seem to follow a gradient. In group 2, the chromosomes within a genome are much more heterogeneous in size and in the relative proportions of the differentiated segments than in group 3. Only in species belonging to group 3 are all or most of the chromosomes metacentric, subequal in size, and uniformly differentiated. The differences between the groups and within group 3 are discussed in relation to the development of translocation systems. Chromosome numbers of 9 taxa are reported for the first time.