Pollinator-mediated gene flow fosters genetic variability in a narrow alpine endemic, Abronia alpina (Nyctaginaceae)

Meredith D. Jabis, Tina J Ayers, Gerard J Allan

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Premise of the study: For rare and endemic plants that exist in small, isolated habitats, natural selection is expected to favor self-compatibility, which can result in low genetic diversity due to inbreeding and genetic drift. Using Abronia alpina, a rare alpine endemic of the California Floristic Province, we demonstrate that there are exceptions to these predictions. Methods: We present the results of both a pollination experiment and a genetic study using AFLPs (amplified fragment length polymorphisms). Using controlled hand-pollination and pollinator observations, we examined the breeding system, pollination ecology, and mechanism for self-incompatibility in A. alpina. Key results: Abronia alpina exhibits an allogamous mating system with probable self-incompatibility resulting from limited growth of pollen tubes originating from self-pollination. Only xenogamous crosses and open-pollinated controls produced seed, and only xenogamous crosses produced pollen tubes that reached the ovary. The molecular study shows that A. alpina has substantial genetic diversity for a rare, endemic species, evidenced by the high percentage of polymorphic loci and average expected heterozygosity. Gene flow among subpopulations, as inferred from AFLP markers, appears to be substantial, although the Kern River is an important physical barrier. Conclusions: Our results indicate that A. alpina is dependent on insects for both seed production and the maintenance of genetic diversity. This finding suggests that pollinators may be crucial to the long-term adaptive potential of rare, endemic plants and that conservation of rare endemics is, in part, dependent on community-level interactions such as plant - pollinator mutualisms.

Original languageEnglish (US)
Pages (from-to)1583-1594
Number of pages12
JournalAmerican Journal of Botany
Volume98
Issue number10
DOIs
StatePublished - Oct 2011

Fingerprint

Nyctaginaceae
Pollination
Gene Flow
pollinator
pollination
pollinators
gene flow
self incompatibility
Pollen Tube
pollen tubes
reproductive strategy
genetic variation
amplified fragment length polymorphism
polymorphism
pollen
seed productivity
Seeds
genetic drift
autogamy
self-pollination

Keywords

  • Abronia
  • AFLP
  • Allogamy
  • Endemic
  • Genetic diversity
  • Outcrossing
  • Pollination biology
  • Population structure
  • Rare plant
  • Self-incompatibility

ASJC Scopus subject areas

  • Plant Science
  • Ecology, Evolution, Behavior and Systematics
  • Genetics

Cite this

Pollinator-mediated gene flow fosters genetic variability in a narrow alpine endemic, Abronia alpina (Nyctaginaceae). / Jabis, Meredith D.; Ayers, Tina J; Allan, Gerard J.

In: American Journal of Botany, Vol. 98, No. 10, 10.2011, p. 1583-1594.

Research output: Contribution to journalArticle

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