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, an endemic florida mint._files/transparent.gif) |
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, an endemic florida mint._files/http_--highwire.stanford.edu-icons-externalservices-pubmed-notfree-jhered-entrez.gif)
Allozyme diversity in
Macbridea alba (Lamiaceae), an endemic florida
mint.
Godt MJ, Walker J, Hamrick
JL.
Department of Plant Biology, University of Georgia,
Athens, GA 30602, USA. godt@plantbio.uga.edu
Macbridea alba is a
herbaceous perennial mint endemic to the panhandle region of Florida. We
used starch gel electrophoresis to describe allozyme diversity and
genetic structure in this federally threatened plant. Ten populations
were analyzed, with an average sample size of 47 plants (range 41-48
plants) per population. Of the 22 loci analyzed, 11 (50%) were
polymorphic, with an average of 36.2% of the loci polymorphic within
populations. Gene diversity measures for the species (Hes = 0.121) and
for the populations (Hep = 0.099) were slightly higher than means found
for other surveyed endemic plants. Compared to nine previously analyzed
woody mints, however, M. alba is genetically depauperate. Little genetic
structure was evident within the species, with 92% of the total genetic
variation found within populations. Genetic identities between
population pairs were high (mean I = 0.98). The perennial life habit of
M. alba and long-distance pollination by bumblebees may contribute to
the maintenance of genetic diversity within this threatened species.
Copyright 2004 The American Genetic Association
PMID: 15220391
[PubMed - in process]
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