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MONOPLASTIDIC CELL DIVISION IN LOWER LAND PLANTS
1Department of Biology, University of Southwestern Louisiana, Lafayette, Louisiana, 70504-2451.
American Journal of Botany
|August 25, 2018
Summary
In single-plastid plant cells, cell division relies on plastid polarity, coordinating nuclear and plastid division. Microtubule systems guide plastid positioning, ensuring equal distribution during mitosis and meiosis.
Area of Science:
- Plant Cell Biology
- Developmental Biology
- Evolutionary Biology
Background:
- Monoplastidic cell division, common in bryophytes and vascular cryptogams, involves a single plastid.
- Plastid polarity, encompassing morphogenetic migration and microtubule organization, is crucial for coordinating nuclear and plastid division.
Purpose of the Study:
- To investigate the role of plastid polarity in coordinating nuclear and plastid division during mitosis and meiosis.
- To explore the contribution of microtubule systems (AMS and QMS) to plastid positioning and spindle ontogeny.
- To understand the evolutionary significance of predivision microtubule systems in monoplastidic cell division.
Main Methods:
- Observational studies of cell division in bryophytes and vascular cryptogams.
- Analysis of microtubule organization, including the preprophase band (PPB), axial microtubule system (AMS), and quadripolar microtubule system (QMS).
- Comparative analysis of division polarity in monoplastidic and polyplastidic sporocytes.
Main Results:
- Plastid migration to the future division plane is a reliable marker of division polarity.
- The preprophase band (PPB) predicts the division plane and is linked to the evolution of meristematic growth.
- Specific microtubule systems (AMS in mitosis, QMS in meiosis) position plastids and influence spindle development.
- In monoplastidic sporocytes, division sites are determined before meiosis, influencing spore domains.
Conclusions:
- Plastid polarity is essential for coordinating nuclear and plastid division in monoplastidic cells.
- Microtubule systems play a critical role in orienting the spindle and ensuring equitable distribution of cellular components.
- Predivision microtubule systems in monoplastidic division may represent early components of the mitotic apparatus, crucial for evolutionary advancements in land plants.
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