Comparative genetic structure of two co-occurring tree species, Maclura pomifera (Moraceae) and Gleditsia triacanthos (Leguminosae)

Title:
Comparative genetic structure of two co-occurring tree species, Maclura pomifera (Moraceae) and Gleditsia triacanthos (Leguminosae)
Authors:
Schnabel, Andrew; Laushman, Roger H.; Hamrick, J. L.
Abstract:
Maclura pomifera, an autotetraploid, and Gleditsia triacanthos, a diploid, are ecologically similar dioecious tree species that often co-occur in early successional habitats throughout the mid-western United States. We studied levels of genetic diversity and patterns of genetic structure for four polymorphic enzyme loci of M. pomifera and 16 polymorphic enzyme loci of G. triacanthos from a single population in eastern Kansas. Levels of expected heterozygosity were high for both species, averaging 0.725 for M. pomifera and 0.366 for G. triacanthos. Although genotypes for nearly all G. triacanthos loci were in Hardy-Weinberg frequencies, three of four M. pomifera loci deviated from equilibrium expectations. Two aspects of genetic structure were explored. First, the extent of clonal growth was estimated by comparing genotypes of stems within 50 G. triacanthos and 32 M. pomifera clumps. The great majority of clumps contained more than one genotype, and in many clumps, all stems were genetically unique. Secondly, as revealed by spatial autocorrelation analyses, genetic substructure was very local for both species, with significant positive autocorrelation occurring only within clumps of individuals or among near neighbours. We argue that this pattern of spatial structure for both species results from extremely local seed dispersal and establishment of individuals from the same multiseeded fruit.
Citation:
Schnabel, A., R.H. Laushman, and J.L. Hamrick. 1991. "Comparative genetic structure of two co-occurring tree species, Maclura pomifera (Moraceae) and Gleditsia triacanthos (Leguminosae)." Heredity 67(3): 357-364.
Publisher:
Blackwell Science Ltd.
DATE ISSUED:
1991-12
Department:
Biology
Type:
Article
PUBLISHED VERSION:
10.1038/hdy.1991.99
Additional Links:
http://www.nature.com/doifinder/10.1038/hdy.1991.99
PERMANENT LINK:
http://hdl.handle.net/11282/596703

Full metadata record

DC FieldValue Language
dc.contributor.authorSchnabel, Andrewen
dc.contributor.authorLaushman, Roger H.en
dc.contributor.authorHamrick, J. L.en
dc.date.accessioned2016-02-18T18:32:42Zen
dc.date.available2016-02-18T18:32:42Zen
dc.date.issued1991-12en
dc.identifier.citationSchnabel, A., R.H. Laushman, and J.L. Hamrick. 1991. "Comparative genetic structure of two co-occurring tree species, Maclura pomifera (Moraceae) and Gleditsia triacanthos (Leguminosae)." Heredity 67(3): 357-364.en
dc.identifier.issn0018-067Xen
dc.identifier.urihttp://hdl.handle.net/11282/596703en
dc.description.abstractMaclura pomifera, an autotetraploid, and Gleditsia triacanthos, a diploid, are ecologically similar dioecious tree species that often co-occur in early successional habitats throughout the mid-western United States. We studied levels of genetic diversity and patterns of genetic structure for four polymorphic enzyme loci of M. pomifera and 16 polymorphic enzyme loci of G. triacanthos from a single population in eastern Kansas. Levels of expected heterozygosity were high for both species, averaging 0.725 for M. pomifera and 0.366 for G. triacanthos. Although genotypes for nearly all G. triacanthos loci were in Hardy-Weinberg frequencies, three of four M. pomifera loci deviated from equilibrium expectations. Two aspects of genetic structure were explored. First, the extent of clonal growth was estimated by comparing genotypes of stems within 50 G. triacanthos and 32 M. pomifera clumps. The great majority of clumps contained more than one genotype, and in many clumps, all stems were genetically unique. Secondly, as revealed by spatial autocorrelation analyses, genetic substructure was very local for both species, with significant positive autocorrelation occurring only within clumps of individuals or among near neighbours. We argue that this pattern of spatial structure for both species results from extremely local seed dispersal and establishment of individuals from the same multiseeded fruit.en
dc.language.isoen_USen
dc.publisherBlackwell Science Ltd.en
dc.identifier.doi10.1038/hdy.1991.99en
dc.relation.urlhttp://www.nature.com/doifinder/10.1038/hdy.1991.99en
dc.subject.departmentBiologyen_US
dc.titleComparative genetic structure of two co-occurring tree species, Maclura pomifera (Moraceae) and Gleditsia triacanthos (Leguminosae)en_US
dc.typeArticleen
dc.identifier.journalHeredityen
dc.subject.keywordAutotetraploidyen_US
dc.subject.keywordGenetic structureen_US
dc.subject.keywordGleditsia tricanthosen_US
dc.subject.keywordMaclura pomiferaen_US
dc.subject.keywordSpatial auto correlationen_US
dc.identifier.volume67en_US
dc.identifier.issue3en_US
dc.identifier.startpage357en_US
dc.rightsArchived with thanks to Heredityen
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