Dynamic F-actin movement is essential for fertilization in Arabidopsis thaliana

Tomokazu Kawashima, Daisuke Maruyama, Murat Shagirov, Jing Li, Yuki Hamamura, Ramesh Yelagandula, Yusuke Toyama, Frédéric Berger

Research output: Contribution to journalArticlepeer-review

59 Scopus citations

Abstract

In animals, microtubules and centrosomes direct the migration of gamete pronuclei for fertilization. By contrast, flowering plants have lost essential components of the centrosome, raising the question of how flowering plants control gamete nuclei migration during fertilization. Here, we use Arabidopsis thaliana to document a novel mechanism that regulates F-actin dynamics in the female gametes and is essential for fertilization. Live imaging shows that F-actin structures assist the male nucleus during its migration towards the female nucleus. We identify a female gamete-specific Rho-GTPase that regulates F-actin dynamics and further show that actin-myosin interactions are also involved in male gamete nucleus migration. Genetic analyses and imaging indicate that microtubules are dispensable for migration and fusion of male and female gamete nuclei. The innovation of a novel actin-based mechanism of fertilization during plant evolution might account for the complete loss of the centrosome in flowering plants.

Original languageEnglish
Article numbere04501
JournaleLife
Volume3
DOIs
StatePublished - 2014

Keywords

  • F-actin
  • Rho-GTPase
  • arabidopsis
  • cytoskeleton
  • fertilization
  • gamete nuclear migration
  • plant biology
  • reproduction

ASJC Scopus subject areas

  • Neuroscience (all)
  • Immunology and Microbiology (all)
  • Biochemistry, Genetics and Molecular Biology (all)

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