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Journal Article

Organelles maintain spindle position in plant meiosis

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Brownfield, L., Yi, J., Jiang, H., Minina, E. A., Twell, D., & Köhler, C. (2015). Organelles maintain spindle position in plant meiosis. Nature Communications, 6(1): 6492. doi:10.1038/ncomms7492.


Cite as: http://hdl.handle.net/21.11116/0000-0007-EA1E-1
Abstract
Accurate positioning of spindles is a critical aspect of cell division as it ensures that each daughter cell contains a single nucleus. In many flowering plants, two meiotic chromosome separations occur without intervening cytokinesis, resulting in two spindles in one cell during the second division. Here we report a detailed examination of two mutants, jason (jas) and parallel spindle1 (ps1), in which disturbed spindle position during male meiosis II results in the incorporation of previously separated chromosome groups into a single cell. Our study reveals that an organelle band provides a physical barrier between the two spindles. The loss of a single protein, JAS, from this organelle band leads to its disruption and a random movement of the spindles. JAS is largely associated with vesicles in the organelle band, revealing a role for vesicles in plant meiosis and that cytoplasmic events maintain spindle position during the chromosome division.