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Abstract Detail

Development and Structure

Burrus, Abagail [1], Kramer, Elena M. [2], Davis, Charles [3].

Gland Development and Evolution in the Malpighiaceae.

The Malpighiaceae are a pantropical flowering plant family that offers oil rewards for pollinators rather than nectar or pollen alone. Presumed to have co-evolved originally with endemic South American oil bees, these plants develop highly specialized glandular tissue borne on the calyx of their flowers, recognized as oil glands. Being the oldest and most species-diverse family with these oil glands, they are intriguing: what trends can we see in their evolution across the family? How did these glands evolve?
To date, broad morphological observations across the family depict neotropical conservation in floral symmetry, gland number, and gland arrangement on the calyx. The popular historical hypothesis is that Malpighiaceae oil glands are homologous to extrafloral nectaries, another glandular structure. A species-level phylogeny newly available for this recalcitrant family and previous anatomical studies’ limitations invite the revisiting of these ideas.
With this new scope and depth, this project presents completed ancestral state reconstructions for various gland anatomical positions, comparing morphological evolutionary trends between floral and extrafloral glands.
Completed developmental trajectories for floral and extrafloral glands of both neotropical and paleotropical members of the family compare gland morphology both floral v. extrafloral (for assessing homology) and neo- v. paleotropical (for assessing conservatism).
Just as the ancestral state reconstructions informed taxa selection for the developmental series, the developmental staging established by the developmental series informed the sampling of glandular tissue for bulk RNA-Seq, pursuing the genetic underpinnings of these fantastic features.

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1 - Harvard University, OEB, 16 Divinity Avenue, BioLabs Rm 1119, Cambridge, MA, 02138, USA
2 - Harvard Univ., OEB, 16 Divinity Avenue, BL 1119, Cambridge, MA, 02138, United States
3 - Harvard University, 22 Divinity Avenue, 22 Divinity Avenue, Cambridge, MA, 02138, United States

oil glands
Trait evolution
Developmental biology

Presentation Type: Oral Paper
Session: DS2, Development and Structure II
Location: /
Date: Wednesday, July 21st, 2021
Time: 12:45 PM(EDT)
Number: DS2011
Abstract ID:424
Candidate for Awards:Katherine Esau Award

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