The mating system of an hydrophilous angiosperm Posidonia australia (Posidoniaceae)

The hydrophilous seagrass Posidonia australis has a wide range of multilocus outcrossing rates (t), which vary from 0 to 0.89, with "apparent" outcrossing rates varying from 0 to 0.42 among the seven populations sampled. This pattern of outcrossing rate indicates that water pollination (hy...

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Bibliographic Details
Published in:American journal of botany 1997-05, Vol.84 (5)
Main Authors: Waycott, M. (The University of Western Australia, Nedlands, Western Australia.), Sampson, J.F
Format: Article
Language:English
Subjects:
AGUA
ALLELES
AQUATIC PLANTS
AUSTRALIA OCCIDENTAL
AUSTRALIE OCCIDENTALE
BIOCHEMICAL POLYMORPHISM
DEBIT
EAU
FLOW RATE
FRUITS
FRUTAS
GASTO
GENE
GENE FLOW
GENES
GENETIC DIVERSITY
GENETIC VARIATION
GENETICA DE POBLACIONES
GENETIQUE DES POPULATIONS
GENOTIPOS
GENOTYPE
GENOTYPES
HELOBIAE
HIDRODINAMICA
HYDRODYNAMICS
HYDRODYNAMIQUE
JUNCAGINACEAE
LOCI
LOCUS
MATING SYSTEMS
METHODE D'ACCOUPLEMENT
OUTCROSSING
PLANTAS ACUATICAS
PLANTE AQUATIQUE
POLIMORFISMO BIOQUIMICO
POLINIZACION
POLLINATION
POLLINISATION
POLYMORPHISME BIOCHIMIQUE
POPULATION GENETICS
SISTEMAS DE APAREAMIENTO
VARIACION GENETICA
VARIATION GENETIQUE
WATER
WATER POLLINATION
WESTERN AUSTRALIA
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Summary:The hydrophilous seagrass Posidonia australis has a wide range of multilocus outcrossing rates (t), which vary from 0 to 0.89, with "apparent" outcrossing rates varying from 0 to 0.42 among the seven populations sampled. This pattern of outcrossing rate indicates that water pollination (hydrophily) is less uniform than wind pollination and more similar to animal pollination in its variability. Variation in levels of outcrossing between populations may be due to differences in water movement; for example, open bays have greater pollen dispersal and higher outcrossing rates. Considerable pollen movement within meadows was inferred from a high frequency of nonmaternal alleles in the pollen pool. The distribution of genetic diversity among populations (G(ST) = 0.229) suggests moderate gene flow on the local scale. These results demonstrate that successful submarine cross-pollination occurs in the hydrophile P. australis, which has a diverse mating system with populations that range from predominantly inbred to predominantly outcrossed
ISSN:0002-9122
1537-2197