Evolution of Symmetry in Plants - Archive ouverte HAL Accéder directement au contenu
Chapitre D'ouvrage Année : 2017

Evolution of Symmetry in Plants

Résumé

Symmetry provides organisms with an efficient means to cope with physical constraints and explore three-dimensional space. We describe the diversity and evolution of symmetry types in the aerial parts of the major group of land plants, the angiosperms. Two main types of symmetry occur: bilateral symmetry, where structures can be divided into two mirror halves, and radial symmetry, with multiple planes of symmetry. Different organ arrangements or phyllotactic patterns produce different types of symmetry, which may vary within a plant's life span. Leaves are usually flat bilaterally symmetrical organs with a bifacial organization resulting from an abaxial-adaxial differentiation associated with photosynthetic activity. Alterations in the genetic pathway underlying this asymmetry are thought to play a role in the repeated evolution of unifacial leaves. Flowers are composed of a series of organs that are considered to be highly modified leaves on a short compact axis. The symmetry of flowers as a whole is one of the most studied traits in plant evolutionary developmental genetics. Bilateral symmetry is derived from radial symmetry, probably from coevolution with specialized pollinators. Nearly 200 transitions in floral symmetry types have been recorded over the course of angiosperm evolution. Symmetry can change
Fichier non déposé

Dates et versions

hal-03889783 , version 1 (16-12-2022)

Identifiants

Citer

Catherine Damerval, Florian Jabbour, Sophie Nadot, Hélène L Citerne. Evolution of Symmetry in Plants. Evolutionary Developmental Biology, pp.1 - 18, 2017, ⟨10.1007/978-3-319-33038-9_59-1⟩. ⟨hal-03889783⟩
43 Consultations
1 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More