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Titolo:
Fitness-consequences of geitonogamous selfing in a clonal marine angiosperm (Zostera marina)
Autore:
Reusch, TBH;
Indirizzi:
Max Planck Inst Limnol, D-24306 Plon, Germany Max Planck Inst Limnol Plon Germany D-24306 imnol, D-24306 Plon, Germany
Titolo Testata:
JOURNAL OF EVOLUTIONARY BIOLOGY
fascicolo: 1, volume: 14, anno: 2001,
pagine: 129 - 138
SICI:
1010-061X(200101)14:1<129:FOGSIA>2.0.ZU;2-D
Fonte:
ISI
Lingua:
ENG
Soggetto:
INBREEDING DEPRESSION; MATING SYSTEM; HERMAPHRODITE PLANTS; POPULATION-STRUCTURE; GENETIC-VARIATION; BREEDING SYSTEMS; OUTCROSSING RATE; IRIS VERSICOLOR; EVOLUTION; FERTILIZATION;
Keywords:
clonal reproduction; geitonogamy; inbreeding depression; marine angiosperm; microsatellite; plant mating system; Zostera marina;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
61
Recensione:
Indirizzi per estratti:
Indirizzo: Reusch, TBH Max Planck Inst Limnol, August Thienemann Str 2, D-24306 Plon,Germany Max Planck Inst Limnol August Thienemann Str 2 Plon Germany D-24306
Citazione:
T.B.H. Reusch, "Fitness-consequences of geitonogamous selfing in a clonal marine angiosperm (Zostera marina)", J EVOL BIOL, 14(1), 2001, pp. 129-138

Abstract

Plant mating systems have received considerable attention because the proportion of selfed vs. outcrossed progeny is an important evolutionary factor. In clonally reproducing plants, geitonogamous selfing between distant ramets belonging to the same genet is expected to be widespread, yet empiricaldata are sparse. Nothing is known about between-ramet selfing in aquatic flowering plants with subaqueous pollen transfer, most of which display pronounced clonal reproduction. From two locations in the western Baltic Sea, Ipresent data on the effects of patch isolation and clonal diversity on theoutcrossing rate of eelgrass, Zostera marina L., based on the genotypes ofmaternal plants and recently fertilized ovules scored at eight microsatellite loci. There were no differences in outcrossing rates between vegetationpatches and continuous meadow although patches were nearly always composedof single genets. Quantitative effects of clonal diversity were present inthe continuous vegetation where a significant positive correlation betweengenet diversity and the proportion of outcrossed offspring was detected (Kendall's tau = 0.82, P = 0.0017). On a population-scale as well, the genotypic diversity was positively correlated with outcrossing. The relative fitness of selfed offspring was low (omega +/- 95% confidence interval = 0.56 +/- 0.032 and 0.322 +/- 0.15) indicating that geitonogamy incurred substantial fitness costs. Selfing rates in Z. marina may not be in evolutionary equilibrium because of spatial and temporal heterogeneity of clonal size and diversity. The high prevalence of dioecy in seagrasses may have evolved to avoid the fitness costs associated with geitonogamy.

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Documento generato il 19/09/20 alle ore 18:34:28