Distinct actin microfilament localization during early cell plate formation through deep learning-based image...

Area of Science:

• Plant cell biology
• Cytoskeletal dynamics
• Cell division

Background:

• Phragmoplasts are essential plant cell structures for cell division.
• Actin microfilaments (AFs) are involved in phragmoplast function, but their precise role in cell plate initiation is debated.
• Conventional imaging techniques face limitations due to phototoxicity and photobleaching.

Purpose of the Study:

• To investigate the localization and dynamics of AFs during the initial phase of cell plate formation.
• To overcome imaging limitations using deep learning-based image restoration.
• To clarify the role of AFs in plant cell division.

Main Methods:

• Utilized deep learning-based image restoration for high-resolution 4D imaging.
• Employing transgenic tobacco BY-2 cells expressing Lifeact-RFP or RFP-ABD2 probes for AF labeling.
• Minimized laser-induced photodamage and phototoxicity during imaging.

Main Results:

• Achieved high-resolution 4D imaging with minimal photodamage.
• Observed distinct localization patterns for RFP-ABD2 and Lifeact-RFP labeled AFs.
• Lifeact-RFP-labeled AFs were localized around the initial cell plate, in addition to near the daughter nucleus.

Conclusions:

• Deep learning imaging enables detailed study of cytoskeletal dynamics with reduced phototoxicity.
• Distinct AF localization suggests specific roles for different AF populations in cell plate formation.
• Lifeact-RFP-labeled AFs appear to play a role in initiating cell plate formation.