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Abstract Detail

Developmental and Structural Section

Vasco, Alejandra [1], Smalls, Tynisha [2], Moran, Robbin [3], Ambrose, Barbara [4].

The evolution and development of leaves in lycophytes and ferns.

There is a vast amount of leaf morphological diversity yet leaves are a common feature found across the land plants. However, not all land plant leaves are considered homologous. The fossil record and anatomical evidence suggest that leaves evolved at least 4 times independently in vascular land plants. Molecular genetic studies have unraveled the network underlying the development of flowering plant leaves and some comparative studies have been performed in lycophytes. However the experimental results in the lycophytes have led to diametrically opposed conclusions about the conservation of a common leaf developmental network between lycophytes and flowering plants. These studies focused on Class III HD-Zip and Class I KNOX genes. To better understand the role of these genes in leaf evolution and development we are cloning and analyzing genes from these 2 key transcription factor families across the lycophytes and ferns. In addition, we are analyzing key leaf genes in a monophyletic group of fern species, Elaphoglossum section Squamipedia, to better understand the evolution and development of leaves in this group that have widely divergent leaf morphologies. Our analyses not only provide insights into leaf development in lycophytes and ferns but also are essential for understanding leaf evolution and development across the land plants.

Broader Impacts:

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1 - New York Botanical Garden, 200th Street And Southern Blvd, Bronx, NY, 10458, USA
2 - The New York Botanical Garden
3 - The New York Botanical Garden, Institute of Systematic Botany, 2900 Southern Blvd., Bronx, NY, 10458, USA
4 - The New York Botanical Garden, IMBS, 200th St. And Southern Blvd., Bronx, NY, 10458, USA

Class III HD-Zip
Class I KNOX.

Presentation Type: Oral Paper:Papers for Sections
Session: 31
Location: Jasperwood/Riverside Hilton
Date: Tuesday, July 30th, 2013
Time: 1:45 PM
Number: 31002
Abstract ID:199
Candidate for Awards:Katherine Esau Award

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