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Isozymes of Coreopsis Section Calliopsis (Compositae): Genetic Variation Within and Divergence Among the Species

Daniel J. Crawford, Edwin B. Smith and Ronald E. Pilatowski
Brittonia
Vol. 36, No. 4 (Oct. - Dec., 1984), pp. 375-381
Published by: Springer on behalf of the New York Botanical Garden Press
Stable URL: http://www.jstor.org/stable/2806598
Page Count: 7
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Isozymes of Coreopsis Section Calliopsis (Compositae): Genetic Variation Within and Divergence Among the Species
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Abstract

Enzyme electrophoresis was employed to examine genetic variation within and among the three diploid (n=12) species comprising Coreopsis section Calliopsis: C. leavenworthii, C. paludosa and C. tinctoria. Twelve enzymes specified by 20 genes were included, and those isozymes localized in the plastids were identified for several of the enzymes. Mean genetic indentities calculated for pair-wise comparisons of 22 populations (four of C. leavenworthii, one for C. paludosa, and 17 of C. tinctoria) reveal no genetic differentiation between C. leavenworthii and C. tinctoria, whereas C. paludosa exhibits lowered values with the other two taxa. These results are in general agreement with concepts of relationships inferred from morphological and biosystematic data. That is, C. paludosa has been viewed as more distinct from C. leavenworthii and C. tinctoria that the latter two are from each other. The high similarity between. C. leavenworthii and C. tinctoria is somewhat unexpected, however, given the several morphological features that serve consistently to distinguish them.

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