Abstract:
:Nuclear migration and positioning are crucial for the morphogenesis of plant cells. We addressed the potential role of nuclear positioning for polarity induction using an experimental system based on regenerating protoplasts, where the induction of a cell axis de novo can be followed by quantification of specific regeneration stages. Using overexpression of fluorescently tagged extranuclear (perinuclear actin basket, kinesins with a calponin homology domain (KCH)) as well as intranuclear (histone H2B) factors of nuclear positioning and time-lapse series of the early stages of regeneration, we found that nuclear position is no prerequisite for polarity formation. However, polarity formation and nuclear migration were both modulated in the transgenic lines, indicating that both phenomena depend on factors affecting cytoskeletal tensegrity and chromatin structure. We integrated these findings into a model where retrograde signals are required for polarity induction. These signals travel via the cytoskeleton from the nucleus toward targets at the plasma membrane.
journal_name
J Integr Plant Bioljournal_title
Journal of integrative plant biologyauthors
Brochhausen L,Maisch J,Nick Pdoi
10.1111/jipb.12469subject
Has Abstractpub_date
2016-09-01 00:00:00pages
799-812issue
9eissn
1672-9072issn
1744-7909journal_volume
58pub_type
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