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- Title
Genetic impoverishment and cross-incompatibility in remnant genotypes of Ziziphus celata (Rhamnaceae), a rare shrub endemic to the Lake Wales Ridge, Florida .
- Authors
Weekley, C.W.; Kubisiak, T.L.; Race, T.M.
- Abstract
Presents a study that uses random amplified polymorphic DNAs (RAPDs) to investigate genetic variability within remnant populations and conducts experimental compatibility trials to determine the cross-compatibility of remnant genotypes. Explanation that the loss of genetic diversity in fragmented populations of self-incompatible plant species may result in sexual reproductive failure and local extinctions; Description of the Florida ziziphus (Ziziphus celata), a self-incompatible clonal shrub known only from five genetically depauperate populations on the Lake Wales Ridge, Florida; Investigation of the Florida ziziphus' genetic structure and sexual reproductive viability; Collection of one hundred and ninety-nine unique stem samples collected from one ex situ and five in situ populations; Identification of 11 multi-locus genotypes (MLGs) based on unweighted pair-group mean cluster analysis (UPGMA); Finding that eight of these MLGs correspond to MLGs identified in an earlier allozyme study; Identification of three new RAPD-based MLGs; Observation that three of the five natural populations consisted of only one MLG, while the largest and most genetically diverse population comprised only four MLGs; Finding that coefficients of similarity ranged from 96.6% for the most closely related MLGs to 20.7% for the most distantly related; Demonstration by the compatibility trials that most MLGs are cross-incompatible; Identification of eight compatible crosses via germination trials; Assignment of MLGs to self-incompatibility (SI) mating types; Conclusion that the breeding population of Florida ziziphus may comprise as few as two SI mating types.
- Subjects
FLORIDA; UNITED States; RAPD technique; REMNANT vegetation conservation; REMNANT vegetation; PLANT species; ZIZIPHUS
- Publication
Biodiversity & Conservation, 2002, Vol 11, Issue 11, p2027
- ISSN
0960-3115
- Publication type
Article
- DOI
10.1023/A:1020810800820