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Titolo:
The reproductive biology of Polytrichum formosum: clonal structure and paternity revealed by microsatellites
Autore:
Van der Velde, M; During, HJ; Van de Zande, L; Bijlsma, R;
Indirizzi:
Univ Groningen, Dept Genet, NL-9751 NN Haren, Netherlands Univ Groningen Haren Netherlands NL-9751 NN L-9751 NN Haren, Netherlands Univ Utrecht, Dept Plant Ecol, Utrecht, Netherlands Univ Utrecht UtrechtNetherlands Dept Plant Ecol, Utrecht, Netherlands
Titolo Testata:
MOLECULAR ECOLOGY
fascicolo: 10, volume: 10, anno: 2001,
pagine: 2423 - 2434
SICI:
0962-1083(200110)10:10<2423:TRBOPF>2.0.ZU;2-Z
Fonte:
ISI
Lingua:
ENG
Soggetto:
POPULATION-STRUCTURE; POLLEN DISPERSAL; GENE FLOW; SPATIAL-DISTRIBUTION; GENOTYPIC DIVERSITY; PLANT-POPULATIONS; MOLECULAR MARKERS; MOSS; DYNAMICS; PATTERNS;
Keywords:
clonal structure; genotypic diversity; male fertilization success; male gamete dispersal; paternity analysis; Polytrichum formosum;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Citazioni:
66
Recensione:
Indirizzi per estratti:
Indirizzo: Van der Velde, M Univ Groningen, Dept Genet, Kerklaan 30, NL-9751 NN Haren, Netherlands Univ Groningen Kerklaan 30 Haren Netherlands NL-9751 NN
Citazione:
M. Van der Velde et al., "The reproductive biology of Polytrichum formosum: clonal structure and paternity revealed by microsatellites", MOL ECOL, 10(10), 2001, pp. 2423-2434

Abstract

Using highly polymorphic microsatellite markers, we assessed clonal structure and paternity in a population of the bryophyte species Polytrichum formosum. Identical multilocus genotypes of individual shoots were almost neverobserved in spatially separated cushions, but were found to be highly clustered within moss cushions. Therefore, asexual reproduction through dispersal of gametophyte fragments is not very important in P. formosum. However, asexual reproduction on a very localized scale through vegetative growth ofgenets (branching of gametophytes via clonal growth of rhizomes) is very extensive. The patchy spatial distribution of genets and the absence of intermingling among genets suggest that this species follows a 'phalanx' clonalgrowth strategy. Vegetative proliferation of genets will increase their size, and, consequently, will have considerable fitness consequences for individuals in terms of increased genet longevity and reproductive output. Although paternity analysis of sporophytes confirmed male genet size, i.e. gamete production, to be an important determinant of male reproductive fitness,it also showed that the spatial distance to female genets is the predominant factor that governs male reproductive success. Moreover, we showed that male gamete dispersal distances in P. formosum are much further than generally assumed, and are in the order of metres rather than centimetres. Combining the findings, we conclude that the high genotypic diversity observed for this facultatively clonal species is most likely explained by a preponderance of sexual reproduction over clonal reproduction.

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Documento generato il 21/09/20 alle ore 15:00:38