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Plant Physiol, June 2001, Vol. 126, pp. 899-909
Novel Patterns of Ectopic Cell Plate Growth and Lipid Body
Distribution in the Arabidopsis gemini pollen1
Mutant1
Soon Ki
Park and
David
Twell*
Department of Biology, University of Leicester, University Road,
Leicester LE1 7RH, United Kingdom
The nature of aberrant gametophytic cell divisions and altered
pollen cell fate in the gemini pollen1
(gem1) mutant was investigated through ultrastructural
analysis. The earliest noticeable defect in gem1 was the
appearance of extended membrane profiles at the early bicellular stage.
These were replaced by ectopic internal walls, which divided the
cytoplasm into twin or multiple cell compartments. Complete or partial
internal walls were callosic with highly complex profiles, indicating
failed guidance or deregulated cell plate growth. Extended membrane
profiles and delayed callose synthesis at division sites further
suggested a novel pattern of cell plate assembly in
gem1. Multiple cell compartments in gem1
adopted vegetative cell fate with regard to lipid body distribution. In
the wild type, lipid bodies appear specifically in the vegetative cell,
whereas in gem1, lipid bodies accumulated in all
cytoplasmic compartments. Our results support the hypothesis that
altered pollen cell fate in gem1 results from abnormal
inheritance of cell fate determinants as a result of disturbed cytokinesis.
1
This work was supported by the Biotechnology and
Biological Science Research Council and The Royal Society.
*
Corresponding author; e-mail twe{at}le.ac.uk; fax 44-116-252-2791.
© 2001 American Society of Plant Physiologists
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