page_title: Preprophase
hierarchical_section_title: Preprophase
caption_attribution_description: English: Microtubule dynamics during preprophase and prophase in plant cell mitosis. The images follow a tobacco BY-2 cell through the first stages of mitosis. N = Nucleus, V = Vacuole, PPB = Preprophase band, MTN = Microtubule nucleation, NEB = Nuclear envelope breakdown. The growing ends of microtubules are shown in green (labeled with green fluorescent protein fused to the microtubule plus end binding protein EB1 of Arabidopsis thaliana). 1) and 2): The preprophase band is visible at the cell wall. 3) Microtubles start nucleating at the nuclear envelope. 4) The preprophase band starts to disappear. 5) Microtubules around the nucleus form the prophase spindle. 6) The nuclear envelope breaks down and the spindle microtubules occupy the nuclear space. Also see the movie corresponding to this figure. The movie is accelerated 100 times. The real time is 12 min.
context_page_description: Preprophase is an additional phase during mitosis in plant cells that does not occur in other eukaryotes such as animals or fungi. It precedes prophase and is characterized by two distinct events:
  The formation of the preprophase band, a dense microtubule ring underneath the plasma membrane.
  The initiation of microtubule nucleation at the nuclear envelope.
context_section_description: Preprophase is an additional phase during mitosis in plant cells that does not occur in other eukaryotes such as animals or fungi. It precedes prophase and is characterized by two distinct events:
  The formation of the preprophase band, a dense microtubule ring underneath the plasma membrane.
  The initiation of microtubule nucleation at the nuclear envelope.
caption: Microtubule dynamics during preprophase and prophase in plant cell mitosis, modified from Donukshe et al.[1] The images follow a tobacco BY-2 cell through the first stages of mitosis (c. 12 minutes). The growing ends of microtubules are shown in green (labeled with green fluorescent protein fused to the microtubule plus end binding protein EB1 of Arabidopsis thaliana). N = Nucleus, V = Vacuole, PPB = Preprophase band, MTN = Microtubule nucleation starts at the nuclear envelope, NEB = Nuclear envelope breakdown at the onset of prometaphase. Also see the movie corresponding to this figure.
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