Journal of Plant Research

, Volume 110, Issue 1, pp 93–106 | Cite as

The quadripolar microtubule system in lower land plants

Invited Article

Abstract

The quadripolar microtubule system (QMS) is a complex array that is associated with predivision establishment of quadripolarity in sporocytes of lower plants (bryophytes and lycopsids). The QMS unerringly predicts the polarity of the two meiotic divisions and plays a central role in development of both the mitotic apparatus (MA) and cytokinetic apparatus (CA) which together accomplish quadripartitioning of the sporocyte into four haploid spores. The QMS is typically, but not exclusively, associated with monoplastidy and precocious quadrilobing of the cytoplasm. In early meiotic prophase the single plastid divides and the resultant plastids migrate so that either the tips of two plastids or the four plastids resulting from a second division are located in the future spore domains. Microtubules that emanate from the plastid tips or from individual plastids in the spore domains interact in the future planes of cytokinesis and give rise to the QMS. The QMS, which encages the prophase nucleus, consists of at least four and usually six (when spore domains are in tetrahedral arrangement) bipolar spindle-like arrays of microtubules presumably with minus ends at plastids in spore domains and plus ends interacting in the future plane of cytokinesis. Each of the six arrays is essentially like the single axial microtubule system (AMS) that intersects the division site and is transformed into the spindle in monoplastidic mitosis in hornworts. As comparative data accumulate, it appears that the AMS is not unique to monoplastidic cell division but instead represents a basic microtubule arrangement that survives as spindle and phragmoplast in cell division of higher plants.

Key words

Cytokinesis Evolution Meiosis Microtubules Mitosis Sporogenesis 

Abbreviations

AMS

axial microtubule system

CA

cytokinetic apparatus

CLSM

confocal laser scanning microscopy

MA

mitotic apparatus

MTCC

microtubule converging center

MTOC

microtubule organizing center

PO

polar organizer

PPB

preprophase band of microtubules

QMS

quadripolar microtubule system

TEM

transmission electron microscopy

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Copyright information

© The Botanical Society of Japan 1997

Authors and Affiliations

  1. 1.Department of BiologyUniversity of Southwestern LouisianaLafayetteUSA

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