PMID: 9443383Jan 27, 1998Paper

The positional control of mitosis and cytokinesis in higher-plant cells

Planta
M I Giménez-AbiánC De la Torre

Abstract

The present work establishes a correlation between cell length and patterns of mitotic microtubular assemblies in Allium cepa L. root meristems. Binucleate cells were formed by a short caffeine treatment which aborted the formation of the phragmoplast during telophase. The largest binucleate cells (about 50 microns in length) behaved as two contiguous mononucleate cells in their next mitosis: they developed two preprophase bands (PPBs), one around each nucleus, where two spindles and two phragmoplasts were subsequently formed. On the other hand, the shortest binucleate cells (about 36 microns in length) formed a single PPB at the site of the aborted phragmoplast and, in the medium-sized cells (about 44 microns) in which the single PPB formed around the nucleus possessing the largest cytoplasmic environment, the two mitotic spindles and the new phragmoplasts moved to, or were assembled in the position of the phragmoplast that had been aborted one cycle earlier. Some rules derive from these observations. First of all, the aborted phragmoplast left a signal for microtubule positioning which was still operative one cycle later, in two-thirds of the bimitoses. Also, that formation of the PPB is dispensable. Moreover, its development...Continue Reading

Citations

Mar 6, 1999·Current Opinion in Plant Biology·M HeeseG Jürgens
Feb 19, 2000·Current Opinion in Plant Biology·A W Sylvester
Feb 7, 2001·The Journal of Cell Biology·F F AssaadG Jürgens

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