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Abstract Detail

Bryological and Lichenological Section/ABLS

Rose, Jeff [1], Kriebel, Ricardo [2], Sytsma, Kenneth J. [3].

From the Ground Up: Evolution of Shape in the Moss Sporophyte (Bryophyta) and its Implications for Land Plant Diversification.

The alternation of generations life cycle represents a key feature of land plant evolution with a prevailing trend of sporophyte evolution from a rounded sporangium in early land plants to an intricately branched vegetative body in seed plants. We test the hypothesis that evolution of sporophyte (capsule) shape of the mosses, the second most diverse land plant lineage, has been driven by physiological demands of life in extreme habitats by reconstructing ancestral sporophyte shape and ancestral habitat on the largest phylogeny of mosses to date. We demonstrate that sporophyte shape is correlated with habitat type, environmental factors can drive the evolution of sporophyte shape in mosses, and that many shifts in diversification rate are correlated with changes in sporophyte shape across the 480 million year history of mosses.  These results suggest that diversification shifts in angiosperms may also be correlated with massive changes in sporophyte form.  Additionally, this study provides an important conceptual framework for analyzing the evolution of a single, homologous character across a deep expanse of time across all branches of the tree of life.

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1 - The University of Wisconsin-Madison, Botany, Madison, WI, 53706, USA
2 - The University of Wisconsin-Madison, Botany, 430 Lincoln Drive, Madison, WI, 53706, USA
3 - University Of Wisconsin, Department Of Botany, Birge Hall, 430 Lincoln Drive, Madison, WI, 53706, USA

alternation of generations
land plants.

Presentation Type: Oral Paper:Papers for Sections
Session: 70
Location: Salon 10/The Shaw Conference Centre
Date: Wednesday, July 29th, 2015
Time: 2:15 PM
Number: 70004
Abstract ID:315
Candidate for Awards:None

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