Publique su "Entrada" aquí (Colaborador@ Registrado)
Este es su espacio para publicar contenido, compartir experiencias, distribuir noticias, hacer comentarios sobre literatura, plantear preguntas, solicitudes de ayuda, sugerencias, apoyo a sus cursos, proyectos en marcha, recursos bibliográficos, etc, cualquier cosa sobre la Morfometría en general!

Todos puen colaborar, una vez que se han registrado. Para registrarse como "colaborador", envíe su email al Editor.

3 de mayo de 2013

Flower Petals Take Shape

 
 Sauret-Gu¨ eto S, Schiessl K, Bangham A, Sablowski R, Coen E (2013)
JAGGED Controls Arabidopsis Petal Growth and Shape by Interacting with a Divergent Polarity Field.
PLoS Biol 11(4): e1001550.
doi:10.1371/journal.pbio.1001550
http://www.plosbiology.org/article/info%3Adoi%2F10.1371%2Fjournal.pbio.1001550

Abstract

A flowering plant generates many different organs such as leaves, petals, and stamens, each with a particular function and shape. These types of organ are thought to represent variations on a common underlying developmental program. However, it is unclear how this program is modulated under different selective constraints to generate the diversity of forms observed. Here we address this problem by analysing the development of Arabidopsis petals and comparing the results to models of leaf development. We show that petal development involves a divergent polarity field with growth rates perpendicular to local polarity increasing towards the distal end of the petal. The hypothesis is supported by the observed pattern of clones induced at various stages of development and by analysis of polarity markers, which show a divergent pattern. We also show that JAGGED (JAG) has a key role in promoting distal enhancement of growth rates and influences the extent of the divergent polarity field. Furthermore, we reveal links between the polarity field and auxin function: auxin-responsive markers such as DR5 have a broader distribution along the distal petal margin, consistent with the broad distal organiser of polarity, and PETAL LOSS (PTL), which has been implicated in the control of auxin dynamics during petal initiation, is directly repressed by JAG. By comparing these results with those from studies on leaf development, we show how simple modifications of an underlying developmental system may generate distinct forms, providing flexibility for the evolution of different organ functions.



Figure 3 Petal clonal analysis after induction at 2 DAP.



No hay comentarios:

Publicar un comentario

Contenido Reciente en el blog de Morfometría Geométrica

Publicar contenido: