Premium
PHYLOGENETIC STUDIES IN EUOENOTHERA
Author(s) -
Steiner Erich
Publication year - 1952
Publication title -
evolution
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.84
H-Index - 199
eISSN - 1558-5646
pISSN - 0014-3820
DOI - 10.1111/j.1558-5646.1952.tb02812.x
Subject(s) - biology , phylogenetic tree , genealogy , phylogenetics , classics , evolutionary biology , library science , history , computer science , genetics , gene
For a number of years Oenothcra has been the object of extensive studies utilizing the cytological and genetical peculiarities of the genus to provide an understanding of phylogenetic relationships within the group." The present study, concerned with the cytogenetic analysis of certain races" of Euoenothera from the southeastern United States, represents one contribution to the reconstruction of the phylogenetic history of the group. The North American euoenotheras belong to two principal cytogenetic types; on the one hand, races occurring primarily in California and :\Iexico are characterized by seven hivalents at meiosis, open-pollinated flowers, and the absence of lethals. The majority of euoenotheras occurring throughout the central and eastern United States, however, exhibit a circle of fourteen chromosomes at meiosis, balanced lethals, and a self-pollinating habit. Cytogenetic analysis of collections from many parts of the range of this latter group has shown it to be composed of many races differing with respect to the end arrangement of the chromosome sets or "complexes" which they carry. Although there occur many isolated races each composed of two complexes with