Arabidopsis FIM5 decorates apical actin filaments and regulates their organization in the pollen tube.

ABSTRACT: The actin cytoskeleton is increasingly recognized as a major regulator of pollen tube growth. Actin filaments have distinct distribution patterns and dynamic properties within different regions of the pollen tube. Apical actin filaments are highly dynamic and crucial for pollen tube growth. However, how apical actin filaments are generated and properly constructed remains an open question. Here we showed that Arabidopsis fimbrin5 (FIM5) decorates filamentous structures throughout the entire tube but is apically concentrated. Apical actin structures are disorganized to different degrees in the pollen tubes of fim5 loss-of-function mutants. Further observations suggest that apical actin structures are not constructed properly because apical actin filaments cannot be maintained at the cortex

SUBMITTER: Zhang M 

PROVIDER: S-EPMC4892729 | biostudies-literature | 2016 May

REPOSITORIES: biostudies-literature