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Abstract Detail

The evolutionary causes and consequences of dioecy across the land plants

Mcdaniel, Stuart [1], Case, Andrea [2].

The evolutionary causes and consequences of dioecy across the land plants.

Significance: The evolution of separate sexes (dioecy) remains an enduring puzzle - why should any organism give up on the economy and reproductive assurance offered by hermaphroditism? We have long known that dioecy has evolved frequently across the land plants, but new data suggest that dioecious lineages may also diversify at lower rates than hermaphroditic lineages. The variation in frequency of dioecy across the land plants makes botanical systems well suited for studying the factors favoring the evolution of dioecy as well as the evolutionary consequences of having separate sexes. Rationale: Theory indicates that deleterious mutations and sexually antagonistic alleles are the two principal drivers of change in plant sexual systems. However, data supporting these predictions are sparse, and have been tested in only a few,distantly related plant groups. Our goal for this symposium is to bring together leading researchers who use a variety of botanical model systems to test classical evolutionary theory relating to the causes and consequences of dioecy, with particular emphasis on the role of sexual antagonism. We have specifically targeted researchers using both bryophytes and angiosperms in order to foster interchange between these two communities and encourage synthesis in future research. The life-history differences between bryophytes and angiosperms (in particular haploid vs. diploid dioecy) allow us to study selection on deleterious and sexually antagonistic mutations under different genomic circumstances. Participants:In addition to our own areas of expertise (McDaniel - bryophyte sex chromosomes and diversification patterns; Case - angiosperm gynodioecy and the genetics of cytoplasmic male sterility), we have chosen researchers with complementary areas of expertise, and those who work on most of the major dioecious plant model systems. We anticipate that bringing this group of researchers together will spark important and timely discussions as well as future inter-disciplinary collaborations, particularly into the evolutionary consequences of sexually antagonistic alleles. Organization: We propose a formal symposium with a 15-min introduction, 30-min talks and time at the end for a synthetic discussion. We have contacted a number of researchers in the field who have confirmed their interest.

Broader Impacts:

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1 - University of Florida, Biology Department, Gainesville, FL, 32611, USA
2 - Kent State University, Box 5190, 256 Cunningham Hall, Kent, OH, 44242-0001, USA, 330-346-0765

none specified

Presentation Type: Symposium or Colloquium Presentation
Session: SY05
Location: Jasperwood/Riverside Hilton
Date: Monday, July 29th, 2013
Time: 1:30 PM
Number: SY05SUM
Abstract ID:24
Candidate for Awards:None

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