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The microtubular cytoskeleton during development of the zygote, proembryo and free-nuclear endosperm inArabidopsis thaliana (L.) Heynh.

Abstract：

:The microtubular cytoskeleton has been studied during development of the zygote, proembryo and free-nuclear endosperm inA. thaliana using immunofluorescence localization of tubulin in enzymatically isolated material. Abundant micro tubules (MTs) are found throughout proembryogenesis. Microtubules in the coenocytic endosperm are mainly internal. By contrast, there is a re-orientation of MTs to a transverse cortical distribution during zygote development, predominantly in a subapical band which accompanies a phase of apical extension. The presence of these cortical arrays coincides with the elongation of the zygote. Cortical arrays also accompany elongation of the cylindrical suspensor. Extensive networks of MTs ramify throughout the cytoplasm of cells in the proembryo proper. Perinuclear arrays are detected in a number of cell types and MTs contribute to typical mitotic configurations during nuclear divisions. Preprophase bands of MTs are absent throughout megasporogenesis and embryo-sac development and do not occur in endosperm cell divisions. We have observed MTs throughout the first division cycle of the zygote. By placing the observed stages in a most probable sequence, we have identified this cell cycle as the point during embryogenesis at which a preprophase band is reinstated as a regular feature of cell division. Preprophase bands were observed to predict planes of cytokinesis in cell divisions up to the octant stage.

journal_name

Planta

journal_title

Planta

authors

Webb MC,Gunning BE

doi

10.1007/BF01102418

subject

Has Abstract

pub_date

1991-06-01 00:00:00

pages

187-95

issue

2

eissn

0032-0935

issn

1432-2048

journal_volume

184

pub_type

杂志文章

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