I assure you that what you are looking at here is indeed a plant. I would like you to meet the peculiar Lacandonia schismatica , one of roughly 55 species belonging to the family Triuridaceae. Not a single member of this family bothers with leaves or even chlorphyll. Instead, all members are mycoheterotrophic, meaning they make their living by parasitizing fungi in the soil.
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International Journal of Plant Sciences, 3. ISSN Full text is not posted in this repository. Consult Related URLs below. 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 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. 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. We document our findings with scanning electron micrographs, histological sections, and dissection microscope views.
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. Repository Staff Only: item control page. A Caltech Library Service. More information and software credits. Item Type: Article. Received: Aug ; Revised: Nov Meyerowitz, and Elena R. No commercial reproduction, distribution, display or performance rights in this work are provided. Tony Diaz.
Spontaneous homeotic transformations have been described in natural populations of both plants and animals, but little is known about the molecular-genetic mechanisms underlying these processes in plants. In the ABC model of floral organ identity in Arabidopsis thaliana, the B- and C-functions are necessary for stamen morphogenesis, and C alone is required for carpel identity. We provide ABC model-based molecular-genetic evidence that explains the unique inside-out homeotic floral organ arrangement of the monocotyledonous mycoheterotroph species Lacandonia schismatica Triuridaceae from Mexico. Whereas a quarter million flowering plant species bear central carpels surrounded by stamens, L.
Development and evolution of the unique floral organ arrangement of Lacandonia schismatica
Skip to search form Skip to main content You are currently offline. Some features of the site may not work correctly. Lacandonia schismatica Triuridaceae is the only known angiosperm species with flowers composed of central stamens surrounded by carpels. If the reproductive axes of this species are interpreted as heterotopic flowers, crucial questions on the evolution of morphological novelties arise, such as: a is this phenotype fixed or whether intermediate floral variants within L. Save to Library. Create Alert.