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Ultrastructural changes of Arabidopsis thaliana pollen during final maturation and rehydration

Published online by Cambridge University Press:  26 September 2008

A.C. Van Aelst
Affiliation:
Wageningen Agricultural University, The Netherlands, and University of Siena, Italy.
E.S. Pierson
Affiliation:
Wageningen Agricultural University, The Netherlands, and University of Siena, Italy.
J.L. Van Went
Affiliation:
Wageningen Agricultural University, The Netherlands, and University of Siena, Italy.
M. Cresti*
Affiliation:
Wageningen Agricultural University, The Netherlands, and University of Siena, Italy.
*
M. Cresti, Dipartimento di Biologia Ambientale, Università di Siena, via P.A. Mattioli 4, I-53100 Siena, Italy.

Summary

Several ultrastructural changes occur during dehydration and subsequent rehydration of Arabidopsis thaliana pollen. The cytoplasmic channels, present in the outer part of the intine of the mature, dehydrating pollen grain, degenerate and develop into electron-dense inclusions. At the same time a large quantity of electron-dense material is deposited in the cavities of the exine. A large number of vesicles is produced in the vegetative cell, and they become predominantly located in the peripheral region near the intine. Starch of amyloplasts is consumed and the lipid bodies which originally surround the sperm cells become randomly distributed. In addition, the individual lipid bodies become enveloped by single rough endoplasmic reticulum cisterns.

Type
Article
Copyright
Copyright © Cambridge University Press 1993

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