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Inside-Out Flowers Characteristic of Lacandonia schismatica Evolved at Least before Its Divergence from a Closely Related Taxon, Triuris brevistylis

Vergara-Silva, Francisco and Espinosa-Matıás, Silvia and Ambrose, Barbara A. and Vázquez-Santana, Sonia and Martínez-Mena, Alejandro and Márquez-Guzmán, Judith and Martínez, Esteban and Meyerowitz, Elliot M. and Álvarez-Buylla, Elena R. (2003) Inside-Out Flowers Characteristic of Lacandonia schismatica Evolved at Least before Its Divergence from a Closely Related Taxon, Triuris brevistylis. International Journal of Plant Sciences, 164 (3). pp. 345-357. ISSN 1058-5893. https://resolver.caltech.edu/CaltechAUTHORS:20161205-124505464

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Abstract

Lacandonia schismatica, a mycoheterotrophic, hermaphroditic monocotyledon endemic to the Lacandon rain forest of southeast Mexico, is the only flowering plant for which a spatial inversion (heterotopy, complete homeosis) of the reproductive floral whorls (stamens and carpels) is known to occur in natural populations. In order to investigate if this autapomorphic inside‐out arrangement of the reproductive organs is fixed in natural populations, we have undertaken extensive and intensive fieldwork spanning several years to locate new populations in addition to the type locality. In parallel, we have also searched for natural variation in floral organ arrangement in Triuris brevistylis, a closely related dioecious triurid that is found in nearby areas of the Lacandon forest. We have found that a small proportion of L. schismatica inflorescences bear unisexual flowers of both sexes, as well as bisexual flowers with differences in the number of reproductive organs. However, in all bisexual flowers, the stamens were always central and the carpels peripheral to them. More important, we have also found that a few T. brevistylis individuals have bisexual flowers with altered positions of stamens and carpels. Among these, flowers with an inside‐out L. schismatica–like floral organ arrangement were observed. We document our findings with scanning electron micrographs, histological sections, and dissection microscope views. The information presented implies that the developmental‐genetic mechanism putatively responsible for homeotic/heterotopic transformations involving floral reproductive organs in the two triurid species originated at least before these taxa diverged from each other. The Mexican triurids may be an example in which the molecular evolutionary events causally related to a major morphological change in plants can best be understood at the microevolutionary scale.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1086/368235DOIArticle
http://www.journals.uchicago.edu/doi/10.1086/368235PublisherArticle
ORCID:
AuthorORCID
Meyerowitz, Elliot M.0000-0003-4798-5153
Additional Information:© 2003 University of Chicago Press. Received: Aug 2002; Revised: Nov 2002.
Subject Keywords:Triuridaceae, Lacandonia schismatica, floral variation, homeosis/heterotopy, ABC model, microevolution
Issue or Number:3
Record Number:CaltechAUTHORS:20161205-124505464
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20161205-124505464
Official Citation:Inside‐Out Flowers Characteristic of Lacandonia schismatica Evolved at Least before Its Divergence from a Closely Related Taxon, Triuris brevistylis Francisco Vergara‐Silva, Silvia Espinosa‐Matías, Barbara A. Ambrose, Sonia Vázquez‐Santana, Alejandro Martínez‐Mena, Judith Márquez‐Guzmán, Esteban Martínez, Elliot M. Meyerowitz, and Elena R. Alvarez‐Buylla International Journal of Plant Sciences 2003 164:3, 345-357
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:72557
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:07 Dec 2016 00:15
Last Modified:03 Oct 2019 16:19

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