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Abstract Detail

A Broader view for Plant EvoDevo: novel approaches for diverse model systems

Niklas, Karl J. [1].

Developmental Modules and the Evolution of Multicellularity.

Multicellularity has evolved in several eukaryotic lineages leading to plants, fungi, and animals. Theoretically, in each case, this involved (1) cell-to-cell adhesion with an alignment-of-fitness among cells, (2) cell-to-cell communication, cooperation, and specialization with an export-of-fitness to a multicellular organism, and (3), in some cases, a transition from “simple” to “complex” multicellularity. When mapped onto a matrix of morphologies based on developmental and physical rules for plants, these three phases help to identify a “unicellular to colonial to filamentous (unbranched branched) to pseudoparenchymatous to parenchymatous” morphological transformation series that is consistent with trends observed within each of the three major plant clades. In contrast, a more direct “unicellular to colonial to parenchymatous” series is observed in fungal and animal lineages. In these contexts, I will discuss the roles played by the cooptation, expansion, and subsequent diversification of ancestral genomic toolkits and patterning modules during the evolution of multicellularity. From an exploration of these modules, I conclude that the extent to which multicellularity is achieved using the same toolkits and modules (and thus the extent to which multicellularity is homologous among different organisms) differs among clades and even among some closely related lineages.

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1 - Cornell University, Plant Biology, 412 Mann Library, Ithaca, NY, 14853-5908, USA

developmental toolkits

Presentation Type: Symposium Presentation
Session: SY02
Location: Salon 11/The Shaw Conference Centre
Date: Monday, July 27th, 2015
Time: 8:15 AM
Number: SY02002
Abstract ID:1543
Candidate for Awards:None

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