Spatial genetic structure and clonal diversity in an alpine population of Salix herbacea (Salicaceae).
OBJECTIVE
Many alpine plant species combine clonal and sexual reproduction to minimize the risks of flowering and seed production in high mountain regions. The spatial genetic structure and diversity of these alpine species is strongly affected by different clonal strategies (phalanx or guerrilla) and the proportion of generative and vegetative reproduction.


METHODS
The clonal structure of the alpine plant species Salix herbacea was investigated in a 3 x 3 m plot of an alpine meadow using microsatellite (simple sequence repeat; SSR) analysis. The data obtained were compared with the results of a random amplified polymorphic DNA (RAPD) analysis.


RESULTS
SSR analysis, based on three loci and 16 alleles, revealed 24 different genotypes and a proportion of distinguishable genotypes of 0.18. Six SSR clones were found consisting of at least five samples, 17 clones consisting of more than two samples and seven single genotypes. Mean clone size comprising at least five samples was 0.96 m(2), and spatial autocorrelation analysis showed strong similarity of samples up to 130 cm. RAPD analysis revealed a higher level of clonal diversity but a comparable number of larger clones and a similar spatial structure.


CONCLUSIONS
The spatial genetic structure as well as the occurrence of single genotypes revealed in this study suggests both clonal and sexual propagation and repeated seedling recruitment in established populations of S. herbacea and is thus suggestive of a relaxed phalanx strategy.
Reisch
Christoph
C
University of Regensburg, Institute of Botany, D-93040 Regensburg, Germany. christoph.reisch@biologie.uni-regensburg.de
Schurm
Sophia
S
Poschlod
Peter
P
D000483:Alleles; D005819:Genetic Markers; D014644:Genetic Variation; D005838:Genotype; D018895:Microsatellite Repeats; D012098:Reproduction / Q000502:physiology; D027343:Rhizome / Q000145:classification / Q000235:genetics / Q000254:growth & development; D032108:Salix / Q000145:classification / Q000235:genetics* / Q000254:growth & development
D005819:Genetic Markers