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Genetics of Adaptive Radiation in Hawaiian and Cook Islands Species of Tetramolopium (Asteraceae; Astereae). I. Nuclear RFLP Marker Diversity

Miki Okada, Richard Whitkus and Timothy K. Lowrey
American Journal of Botany
Vol. 84, No. 9 (Sep., 1997), pp. 1236-1246
Stable URL: http://www.jstor.org/stable/2446048
Page Count: 11
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Genetics of Adaptive Radiation in Hawaiian and Cook Islands Species of Tetramolopium (Asteraceae; Astereae). I. Nuclear RFLP Marker Diversity
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Abstract

Thirty-three nuclear RFLP (restriction fragment length polymorphism) probes were used to study genetic diversity in Hawaiian and Cook Islands species of Tetramolopium for comparison with previous morphological and isozyme studies and to provide greater resolution of the events associated with adaptive radiation in the genus Levels of RFLP diversity are greater than those reported for isozymes, yet are still low in comparison to continental species Genetic differentiation is greatest among species in sections rather than among sections and is concordant with the hypothesis of phyletic sorting of initial variability as suggested for morphological traits. Hypothesized introgression between T lepidotum and T filiforme is supported, but the evidence suggests bidirectional gene flow Systematic relationships derived from the data agree with hypotheses based on morphology in the placement of populations within their respective species and the recognition of three main lineages within Hawaii Inclusion of the Cook Islands species, however, renders section Tetramolopium paraphyletic, contradicting morphological, ecological, and crossing evidence Interpreting these results in light of evidence from previous studies, the genetic diversity and relationships seen among species and sections of Hawaiian and Cook Islands Tetramolopium reflect the recent and rapid evolution of this group, limited addition of new variability, and phyletic sorting

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