Eunuchs or Females? Causes and Consequences of Gynodioecy on Morphology, Ploidy, and Ecology of Stellaria graminea L. (Caryophyllaceae)
Open Access
- 12 April 2021
- journal article
- research article
- Published by Frontiers Media SA in Frontiers in Plant Science
Abstract
Plant speciation results from intricate processes such as polyploidization, reproductive strategy shifts and adaptation. These evolutionary processes often co-occur, blurring their respective contributions and interactions in the speciation continuum. Here, relying on a large-scale study, we tested whether gynodioecy triggers the divergent evolution of flower morphology and genome between sexes, and contributes to the establishment of polyploids and colonization of ecological niches in Stellaria graminea. We found that gynodioecy in S. graminea leads to flower morphology divergence between females and hermaphrodites, likely due to sexual selection. Contrary to our expectations, gynodioecy occurs evenly in diploids and tetraploids, suggesting that this reproductive strategy was not involved in the establishment of polyploids. Both diploid and tetraploid females have a larger genome size than hermaphrodites, suggesting the presence of sex chromosomes. Finally, ecology differs between cytotypes and to a lesser extent between sexes, suggesting that the link between environment and presence of females is indirect and likely explained by other aspects of the species’ life history. Our study shows that gynodioecy leads to the consistent evolution of sexual traits across a wide range of populations, cytotypes and environments within a given species, and this likely contributes to the phenotypic and genetic distinctiveness of the species from its sister clades.Keywords
This publication has 96 references indexed in Scilit:
- Gender plasticity and sexual system stability in WurmbeaAnnals of Botany, 2011
- TheIndex to Plant Chromosome Numbers(Ipcn): Three Decades of Publication by the Missouri Botanical Garden Come to An EndAnnals of the Missouri Botanical Garden, 2011
- Distribution and habitat segregation on different spatial scales among diploid, tetraploid and hexaploid cytotypes of Senecio carniolicus (Asteraceae) in the Eastern AlpsAnnals of Botany, 2010
- Recent advances in the study of gynodioecy: the interface of theory and empiricismAnnals of Botany, 2009
- The reproductive biology of Stellaria longipes Goldie (Caryophyllaceae) in North AmericaFlora, 2007
- Sex ratio variation in gynodioecious Lobelia siphilitica: effects of population size and geographic locationJournal of Evolutionary Biology, 2007
- Pollen–Stigma Interference in Two Gynodioecious Species of Lamiaceae with Intermediate IndividualsAnnals of Botany, 2006
- Dry environments promote the establishment of females in monomorphic populations of Wurmbea biglandulosa (Colchicaceae)Evolutionary Ecology, 2005
- The molecular basis of cytoplasmic male sterility and fertility restorationTrends in Plant Science, 1998
- REPRODUCTIVE BIOLOGY OF STELLARIA LONGIPES GOLDIE AS REVEALED BY A CULTIVATION EXPERIMENTNew Phytologist, 1980