Sexual stability in the nearly dioecious Pinus johannis (Pinaceae)

Lluvia Flores-Rentería, Francisco Molina-Freaner, Amy V Whipple, Catherine A Gehring, C. A. Domínguez

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Premise of the study: Even though dioecy is a dominant sexual system among gymnosperms, little is known about its evolutionary history. Pinus johannis may represent a model system because unisexual and monoecious individuals compose its populations. The presence of unisexual individuals in other Pinus species is a consequence of sexual lability. Here we determined whether P. johannis represents the first example of a dioecious or nearly dioecious reproductive system in conifers by evaluating its sexual stability. Methods: To assess the stability of sexual expression, we quantified the proportion of male vs. female reproductive structures produced by trees over multiple years and tested for the presence of sexual dimorphism. Sexual lability hypotheses were also examined by looking at the relationship between environmental factors and sexual expression and by comparing the reproductive behavior of P. johannis with its closest labile relative, P. edulis. Key results: Pinus johannis is nearly dioecious: ∼99% of individuals are unisexual or express a low proportion of the opposite gender with few changes in sexual expression through time. We found sexual dimorphism consistent with sexual stability. Sexual expression did not vary with tree size/age, abiotic environment, or herbivore removal, providing evidence against sexual lability. Individuals of P. johannis tended to produce only male or female strobili, whereas those of P. edulis were mainly monoecious with a gradient in the female to male strobili ratio. Conclusions: This study represents the first report of a nearly stable dioecious Pinus species. The variety of sexual morphs coexisting in the same population makes P. johannis a model for studying the evolution of dioecy in gymnosperms.

Original languageEnglish (US)
Pages (from-to)602-612
Number of pages11
JournalAmerican Journal of Botany
Volume100
Issue number3
DOIs
StatePublished - Mar 2013

Fingerprint

Pinaceae
Pinus
dioecy
gymnosperm
Gymnosperms
sexual dimorphism
Sex Characteristics
reproductive behavior
Coniferophyta
sexual systems
Reproductive Behavior
Herbivory
coniferous tree
herbivore
gender
reproductive system
environmental factor
morphs
Population
conifers

Keywords

  • Dioecy
  • Gymnosperms
  • Paradioecy
  • Pinaceae
  • Pinus johannis
  • Secondary dimorphic features
  • Sexual stability
  • Unisexuality

ASJC Scopus subject areas

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

Cite this

Sexual stability in the nearly dioecious Pinus johannis (Pinaceae). / Flores-Rentería, Lluvia; Molina-Freaner, Francisco; Whipple, Amy V; Gehring, Catherine A; Domínguez, C. A.

In: American Journal of Botany, Vol. 100, No. 3, 03.2013, p. 602-612.

Research output: Contribution to journalArticle

Flores-Rentería, Lluvia ; Molina-Freaner, Francisco ; Whipple, Amy V ; Gehring, Catherine A ; Domínguez, C. A. / Sexual stability in the nearly dioecious Pinus johannis (Pinaceae). In: American Journal of Botany. 2013 ; Vol. 100, No. 3. pp. 602-612.
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