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JXB Advance Access originally published online on December 26, 2008
Journal of Experimental Botany 2009 60(2):495-508; doi:10.1093/jxb/ern321
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© The Author [2008]. Published by Oxford University Press [on behalf of the Society for Experimental Biology]. All rights reserved. For Permissions, please e-mail: journals.permissions@oxfordjournals.org

REVIEW-ARTICLE

Organelle motility in the pollen tube: a tale of 20 years

Giampiero Cai* and Mauro Cresti

Dipartimento Scienze Ambientali, Università di Siena, via Mattioli 4, I-53100 Siena, Italy

* To whom correspondence should be addressed: E-mail: cai{at}unisi.it

Organelle movement is an evident feature of pollen tubes and is essential for the process of tube growth because it enables the proper distribution of organelles and the accumulation of secretory vesicles in the tube apex. Organelles move along the actin filaments through dynamic interactions with myosin but other proteins are probably responsible for control of this activity. The role of microtubules and microtubule-based motors is less clear and somewhat enigmatic. Nevertheless, the pollen tube is an excellent cell model in which to study and analyse the molecular mechanisms that drive and control organelle motility in relation to plant cell expansion. Current knowledge and the main scientific discoveries in this field of research over the last 20 years are summarized here. Future prospects in the study of the molecular mechanisms that mediate organelle transport and vesicle accumulation during pollen tube elongation are also discussed.

Key words: Actin filaments, cell growth, cytoplasmic movement, kinesin, microtubules, myosin, organelles, pollen tube

Received 10 September 2008; Revised 18 November 2008 Accepted 18 November 2008


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