Seed dispersal and fine-scale genetic structuring in the asexual Nigritella miniata (Orchidaceae) in the Alps

Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskrift

Abstract

Orchids have minute, air-filled seeds and are considered as efficient dispersers and colonizers. Yet, empirical studies show that most seeds fall within the nearest metre from the mother plant in orchids, and that individuals standing close to each other are often closely related. A poor contribution to gene dispersal by seeds may be compensated for by more efficient dispersal by pollen, but in autogamous or agamospermous orchids this component is not available. Here, we used two highly variable simple sequence repeat loci to analyze fine-scale genetic structure in the agamospermous orchid Nigritella miniata, which is widespread in alpine grasslands in the Dolomites. We studied a densely populated area of 30×50 m and an enlarged area of 100×500 m with more scattered occurences. Sp statistics, describing the decrease in relatedness with geographic distance, were 0.1073 and 0.0609, respectively, and were among the highest values recorded for the orchid family, revealing a strong genetic structuring. Still, some of the genotypes in the studied area were distributed at distances up to 26.5 km in the Dolomites, which suggests that long-distance seed dispersal occurs occasionally and that populations separated by long distances can still be parts of the same metapopulation system.

Detaljer

Författare
Enheter & grupper
Externa organisationer
  • Arbeitskreis Heimische Orchideen Baden-Württemberg
Forskningsområden

Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Botanik
Originalspråkengelska
Sidor (från-till)83-100
TidskriftBotanical Journal of the Linnean Society
Volym190
Utgivningsnummer1
StatusPublished - 2019 apr 26
PublikationskategoriForskning
Peer review utfördJa