Journal
PLANT CELL
Volume 23, Issue 6, Pages 2302-2313Publisher
AMER SOC PLANT BIOLOGISTS
DOI: 10.1105/tpc.111.087940
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Funding
- Max Planck Gesellschaft
- Direct For Biological Sciences
- Division Of Integrative Organismal Systems [0922947] Funding Source: National Science Foundation
- Directorate For Engineering [0937657] Funding Source: National Science Foundation
- Emerging Frontiers & Multidisciplinary Activities [0937657] Funding Source: National Science Foundation
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In eukaryotic cells, the actin and microtubule (MT) cytoskeletal networks are dynamic structures that organize intracellular processes and facilitate their rapid reorganization. In plant cells, actin filaments (AFs) and MTs are essential for cell growth and morphogenesis. However, dynamic interactions between these two essential components in live cells have not been explored. Here, we use spinning-disc confocal microscopy to dissect interaction and cooperation between cortical AFs and MTs in Arabidopsis thaliana, utilizing fluorescent reporter constructs for both components. Quantitative analyses revealed altered AF dynamics associated with the positions and orientations of cortical MTs. Reorganization and reassembly of the AF array was dependent on the MTs following drug-induced depolymerization, whereby short AFs initially appeared colocalized with MTs, and displayed motility along MTs. We also observed that light-induced reorganization of MTs occurred in concert with changes in AF behavior. Our results indicate dynamic interaction between the cortical actin and MT cytoskeletons in interphase plant cells.
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