Ultrastructure of cell division in the fusiform cells of the vascular cambium of Robinia pseudoacacia |
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Authors: | J J Farrar Ray F Evert |
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Institution: | (1) Department of Botany, 430 Lincoln Drive, University of Wisconsin, Madison, WI 53706-1831, USA, US |
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Abstract: | The ultrastructure of periclinally dividing fusiform cells was studied in the vascular cambium of Robinia pseudoacacia. Fusiform cell division begins in April at Madison, Wisconsin, when the cambial cells still have many characteristics of
a dormant cambium. Soon afterward, the cambial cells acquire the appearance typical of an active cambium. Sequential phases
of the microtubule cycle were documented: cortical microtubules bordering the cell wall during interphase, perinuclear microtubules
preceding formation of the mitotic spindle, spindle microtubules, and phragmoplast microtubules. A preprophase band of microtubules
was not encountered. An extended phragmosome was not encountered in periclinally dividing fusiform cells. During cytokinesis,
the phragmosome is represented by a broad cytoplasmic plate which precedes the developing phragmoplast and cell plate as they
migrate toward the ends of the cell. |
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Keywords: | Cell division Cytokinesis Fusiform cells Mitosis Robinia pseudoacacia |
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