NDLI: Chloroplast DNA variation inCoreopsis nuecensoides andC. nuecensis (Asteraceae), a presumed progenitor-derivative species pair

Content Provider	Springer Nature Link
Author	Mason Gamer, Roberta J. Holsinger, Kent E. Jansen, Robert K.
Copyright Year	1999
Abstract	Coreopsis nuecensoides andC. nuecensis are narrowly distributed endemics of southeastern Texas. While they overlap in range, they differ in chromosome number, and F1 hybrids exhibit strong sterility barriers. Previous morphological, cytogenetic, and allozyme studies suggested thatC. nuecensoides andC. nuecensis are very closely related members of a progenitor-derivative species pair. The two species differ substantially in terms of their leaf flavonoid chemistry, but the flavonoid data do not address the exact nature of the relationship between them. We have further examined the relationship between the species by analyzing genetic diversity within both species using chloroplast DNA (cpDNA) restriction site data. Sixteen restriction site changes were used to define thirteen distinct cpDNA haplotypes. The pattern of relationships among haplotypes provides some support for the presumed ancestor-descendent relationship, but other interpretations are possible. Only one cpDNA haplotype was shared by the two species; of the remaining twelve, seven were unique to one species and five to the other. This result is consistent with results of flavonoid studies, in which each species exhibited flavonoid compounds not seen in the other, but differs from the allozyme results, in which the vast majority of alleles were shared by both species and only the presumed progenitor exhibited unique alleles. Taken together, the data support a very close relationship between the species, but are equivocal with regard to a progenitor-derivative relationship.
Starting Page	5
Ending Page	12
Page Count	8
File Format	PDF
ISSN	03782697
Journal	Plant Systematics and Evolution
Volume Number	218
Issue Number	1-2
e-ISSN	16156110
Language	English
Publisher	Springer-Verlag
Publisher Date	1999-01-01
Publisher Place	Vienna
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Compositae Asteraceae Coreopsis Speciation chloroplast DNA Plant Ecology Plant Sciences Plant Anatomy/Development Plant Systematics/Taxonomy/Biogeography
Content Type	Text
Resource Type	Article
Subject	Plant Science Ecology, Evolution, Behavior and Systematics

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