Abstract Detail

Recent Topics Posters

Kinser, Taliesin [1], Puzey, Joshua [1].

Asymmetric Hybrid Incompatibility Drives Speciation in Neo-Allopolyploid Monkeyflower.

Hybridization is common in angiosperms, bringing together two genomes of separate evolutionary trajectories into intimate contact. This contact first occurs during fertilization both of the egg and a second fertilization event of the endosperm. Outcrossing offers benefits of genetic diversity and heterozygosity, but introduces sexual conflict of different mating strategies in the developing endosperm. Mitigation of this conflict is largely driven by the ratio of parental genomes in the endosperm. Polyploidy, however, can alter these ratios, thus affecting sexual conflict. This imbalance can lead to seed lethality, with successful seeds typically only developing when the maternal plant is of higher ploidy. The mechanisms that drive this success or failure are not well understood. We use a recent hybrid system in Mimulus that has a unique opposite direction in hybrid seed viability (paternal plant of higher ploidy) to study the mechanistic underpinnings of seed development and its genomic interactions. Here we trace morphological features of development in parental and hybrid seeds to test for endosperm abnormalities in reciprocal hybrid crosses. We next aim to determine patterns of genomic interactions and conflict in the hybrids. We expect to better understand how genomic interactions drive endosperm development and how they determine the outcome of this speciation event.  

Related Links:
Puzey Lab Page

1 - College of William and Mary, Biology, P.O. Box 8795, Williamsburg, VA, 23187-8795, USA

Keywords:
speciation
hybridization
polyploidy
Mimulus.

Presentation Type: Recent Topics Poster
Session: P, Recent Topics Posters
Location: Exhibit Hall/Savannah International Trade and Convention Center
Date: Monday, August 1st, 2016
Time: 5:30 PM
Number: PRT016
Abstract ID:1201
Candidate for Awards:None