Create your own conference schedule! Click here for full instructions

Abstract Detail



Pteridological Section/AFS

Kandlikar, Gaurav [1], Freund, Forrest [2], Johnson, Gabriel [3], Taylor, W. Carl [4], Zimmer, Elizabeth [5].

Chloroplast DNA reveals uniparental plastid inheritance from Isoetes engelmannii in two allotetraploid speciation events.

It has long been known that speciation in plants is commonly driven by changes in ploidy levels. In fact, recent estimates suggest that 15% of the speciation events in flowering plants and 31% of speciation events in ferns are associated with increases in ploidy levels. Isoetes L. (quillworts) is a genus of heterosporous lycopsids comprised of >200 species. Despite their ancient origin and cosmopolitian distribution, Isoetes species do not exhibit significant morphological variation, and individuals of various species often cohabitate small landscapes. Furthermore, almost 50% of the Isoetes species found in North America are polyploids. These characteristics suggest that allopolyploidy may be a major cause of speciation in the genus. We generated DNA sequences from I. riparia and I. appalachiana, their basic diploid parents, and intermediate sterile hybrids. All detected mutations support I. engelmannii as the chloroplast donor (likely maternal parent) to both allotetraploids studied. Subsequent greenhouse experiments to perform bidirectional crosses between parental species may suggest mechanistic explanations to our results. Understanding the drivers speciation in this ancient genus may yield insight into the nature of polyploid speciation in other land plant lineages.


Log in to add this item to your schedule

1 - University of Minnesota, Minneapolis, MN, 55317, USA
2 - Rancho Santa Ana Botanic Garden & Claremont Graduate University, 1500 N College Ave, Claremont, CA, 91711, USA
3 - 3218 11th Place SE, Washington, DC, 20032, USA
4 - DIVISION OF ENVIRONMENTAL BIOLOGY, 2912 22nd St N, ARLINGTON, VA, 22201, USA
5 - Smithsonian National Museum Of Natural History, MUSEUM SUPPORT CENTER, P.O. Box 37102, Washington, DC, 20013-7102, USA

Keywords:
hybridization
Isoetes
polyploidy.

Presentation Type: Poster:Posters for Sections
Session: P
Location: Eyrie/Boise Centre
Date: Monday, July 28th, 2014
Time: 5:30 PM
Number: PPD001
Abstract ID:76
Candidate for Awards:None


Copyright 2000-2013, Botanical Society of America. All rights reserved