Inside‐Out Flowers Characteristic of<i>Lacandonia schismatica</i>Evolved at Least before Its Divergence from a Closely Related Taxon,<i>Triuris brevistylis</i>

Vergara‐Silva, Francisco; Espinosa‐Matías, Silvia; Ambrose, Barbara A.; Vázquez‐Santana, Sonia; Martínez‐Mena, Alejandro; Márquez‐Guzmán, Judith; Martı́nez, Esteban; Meyerowitz, Elliot M.; Álvarez-Buylla, Elena

doi:10.1086/368235

Cited by 33 publications

(27 citation statements)

References 48 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Female flowers of T. brevistylis have a strikingly similar developmental pattern to those of L. schismatica (Ambrose et al, 2006). Moreover, careful screening of the natural variation among female flowers of T. brevistylis identified the presence of central staminoids with viable pollen in a few individuals of this species (Vergara-Silva et al, 2003). Given these findings, if the common ancestor of the Mexican Triuridaceae had flowers similar to current T. brevistylis female individuals, the de novo activation of B-class genes (AP3 in particular) in the central whorl would have required a single mutational step.…”

Section: Discussionmentioning

confidence: 87%

“…schismatica (Lacandoniaceae = Triuridaceae; Martínez and Ramos, 1989;Maas-van de Kamer, 1995;Mabberley, 1997;Kubitzki, 1998) is a mycoheterotrophic, monocotyledonous species endemic to the Mexican Lacandon rainforest (Vergara-Silva et al, 2003), and its flowers have a cleistogamic preanthesis mode of reproduction (i.e., fertilization occurs before the flower opens; Má rquez-Guzmá n et al, 1993). Along with its taxonomic description , initial detailed studies of the reproductive morphology and anatomy of the species (Má rquez-Guzmá n et al, 1989) emphasized that there is an (Jack et al, 1994;Krizek and Meyerowitz, 1996).…”

Section: Discussionmentioning

confidence: 99%

“…However, in the context of the evidence presented here, the genetic alterations underlying central B-function gene expression in L. schismatica could be preliminarily understood in a phylogenetic context. Morphological analyses of the sister taxon of L. schismatica, T. brevistylis, a dioecious member of the family Triuridaceae also distributed in the Lacandon rainforest (Vergara-Silva et al, 2003), are worth mentioning. Female flowers of T. brevistylis have a strikingly similar developmental pattern to those of L. schismatica (Ambrose et al, 2006).…”

Section: Discussionmentioning

confidence: 99%

“…Observations of reproductive axes in the putative sister taxon of L. schismatica, the neotropical triurid, Triuris brevistylis, have also indicated the presence of this particular homeotic arrangement; however, such flowers are very rare and do not constitute an established floral morph in the wild (Vergara-Silva et al, 2003). To our knowledge, a peculiar teratology in the alismatid Echinodorus amazonicus (Sattler and Singh, 1978) is the only additional record of a floral homeotic/heterotopic phenotype where central stamens appear surrounded by carpels.…”

Section: Introduction An Abc Model-based Hypothesis Of the Developmenmentioning

confidence: 91%

“…schismatica is a mycoheterotrophic plant species, which cannot be grown in the laboratory as its survival depends on endophytic fungi Vergara-Silva et al, 2003). Hence, we are unable to perform genetic experiments or induce mutations to experimentally test the roles of the B-function genes directly in this species.…”

Section: Schismatica B-function Genes Are Able To Determine Stamenmentioning

confidence: 99%

See 4 more Smart Citations

B-Function Expression in the Flower Center Underlies the Homeotic Phenotype ofLacandonia schismatica(Triuridaceae)

et al. 2010

Self Cite

View full text Add to dashboard Cite

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. schismatica stamens occur in the center of the flower and are surrounded by carpels. The simplest explanation for this is that the B-function is displaced toward the flower center. Our analyses of the spatio-temporal pattern of B-and C-function gene expression are consistent with this hypothesis. The hypothesis is further supported by conservation between the B-function genes of L. schismatica and Arabidopsis, as the former are able to rescue stamens in Arabidopsis transgenic complementation lines, and Ls-AP3 and Ls-PI are able to interact with each other and with the corresponding Arabidopsis B-function proteins in yeast. Thus, relatively simple molecular modifications may underlie important morphological shifts in natural populations of extant plant taxa. INTRODUCTION An ABC Model-Based Hypothesis of the Developmental Genetic Factors Underlying the Unusual Reproductive Morphology of Lacandonia schismaticaThe ABC model for the specification of floral organ identity Coen and Meyerowitz, 1991;Meyerowitz et al., 1991) has played a critical role in the modern explanation of the molecular-genetic determinants of the ontogenetic development of reproductive structures in angiosperms. This combinatorial genetic model has guided diverse plant evolutionary developmental biology studies, especially during the formative years of this young field (Cronk, 2001;Cronk et al., 2002;Pruitt et al., 2003). As part of the larger discipline of evo-devo, the articulation of explanatory tools like the ABC model is considered essential for understanding the developmental mechanisms that underlie morphological innovation throughout evolutionary time (Cronk et al., 2002;Carroll et al., 2004;Gilbert, 2006;Wolpert et al., 2006).The ABC model of flower development was based on the interpretation of floral homeotic phenotypes in Arabidopsis thaliana and Antirrhinum majus (Coen and Meyerowitz, 1991). However, the participation of homeotic transformations and other forms of heterotopy in the appearance of new organ arrangements during the evolution of angiosperms had already been considered in the botanical literature, long before the age of plant developmental genetics (e.g., Meyer, 1966;Sattler, 1984;Bowman et al., 1989;Weston, 2000). Outstanding instances of spontaneous floral homeotic phenotypes have continued to be recorded in well-characterized taxa (s...

show abstract

Section: Discussionmentioning

confidence: 87%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introduction An Abc Model-based Hypothesis Of the Developmenmentioning

confidence: 91%

Section: Schismatica B-function Genes Are Able To Determine Stamenmentioning

confidence: 99%

See 3 more Smart Citations

B-Function Expression in the Flower Center Underlies the Homeotic Phenotype ofLacandonia schismatica(Triuridaceae)

et al. 2010

Self Cite

View full text Add to dashboard Cite

show abstract

Floral Architecture: Regulation and Diversity of Floral Shape and Pattern

Kramer

2018

Annual Plant Reviews Online

View full text Add to dashboard Cite

show abstract

Role of transcriptional regulation in the evolution of plant phenotype: A dynamic systems approach

Rodríguez-Mega

Piñeyro‐Nelson

Gutiérrez

et al. 2015

Developmental Dynamics

View full text Add to dashboard Cite

A growing body of evidence suggests that alterations in transcriptional regulation of genes involved in modulating development are an important part of phenotypic evolution, and this can be documented among species and within populations. While the effects of differential transcriptional regulation in organismal development have been preferentially studied in animal systems, this phenomenon has also been addressed in plants. In this review, we summarize evidence for cis-regulatory mutations, trans-regulatory changes and epigenetic modifications as molecular events underlying important phenotypic alterations, and thus shaping the evolution of plant development. We postulate that a mechanistic understanding of why such molecular alterations have a key role in development, morphology and evolution will have to rely on dynamic models of complex regulatory networks that consider the concerted action of genetic and nongenetic components, and that also incorporate the restrictions underlying the genotype to phenotype mapping process. Developmental Dynamics 244:1074-1095, 2015. V C 2015 Wiley Periodicals, Inc.Key words: phenotypic evolution; gene regulation; epigenetics; evo-devo; gene regulatory networks IntroductionIn this review article, we will provide evidence to connect natural phenotypic variation in plants to heritable changes in epigenetic and transcriptional regulation and discuss how plant phenotypic alteration can be explained by the relative position of regulators within gene regulatory networks. In the first section of the article, we show how plant phenotypic variation can be generated by different mechanisms of gene transcriptional regulation. The second section comprises diverse evidence for plant phenotypic evolution related to three main regulatory alterations: epigenetic modifications, cis-regulatory changes, and trans-regulatory changes. We also briefly talk about the fitness costs of natural regulatory variation in plant populations. Finally, we address the importance of a systems perspective for understanding how genetic and epigenetic alterations map onto phenotypic changes by altering complex gene regulatory networks and affecting the evolution of plant phenotype, and discuss some of the technological approaches that could advance this field.

show abstract

Inside‐Out Flowers Characteristic ofLacandonia schismaticaEvolved at Least before Its Divergence from a Closely Related Taxon,Triuris brevistylis

Cited by 33 publications

References 48 publications

B-Function Expression in the Flower Center Underlies the Homeotic Phenotype ofLacandonia schismatica(Triuridaceae)

B-Function Expression in the Flower Center Underlies the Homeotic Phenotype ofLacandonia schismatica(Triuridaceae)

Floral Architecture: Regulation and Diversity of Floral Shape and Pattern

Role of transcriptional regulation in the evolution of plant phenotype: A dynamic systems approach

Contact Info

Product

Resources

About