Journal Article

Dynamic Organization of Microtubules in Guard Cells of <i>Viciafaba</i> L. with Diurnal Cycle

Megumi Fukuda, Seiichiro Hasezawa, Naoko Asai, Nobuyoshi Nakajima and Noriaki Kondo

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 39, issue 1, pages 80-86
Published in print January 1998 | ISSN: 0032-0781
Published online January 1998 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/oxfordjournals.pcp.a029293
Dynamic Organization of Microtubules in Guard Cells of Viciafaba L. with Diurnal Cycle

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Stomatal movement is regulated by changes in the volume of guard cells, thought to be mainly controlled by an osmo-regulatory system. In the present study, we examined the additional involvement of cytoskeletal events in the regulation of stomatal movement. Microtubules (MTs) in guard cells of Viciafaba L., grown under sunlight, were observed during the day and night by immunofluorescence microscopy. Cortical MTs began to be organized in a radial array at dawn and increased in numbers in the morning following the increase in the stomatal aperture size. Thereafter, MTs became localized near the nucleus and began to be destroyed from the evening to midnight, following the decrease in stomatal aperture size. These diurnal changes in MT organization were observed even two days after transfer from natural light condition to total darkness, and were accompanied by corresponding changes in stomatal aperture. The increase in stomatal aperture size in the early morning was inhibited by 50 μM propyzaraide, which destroys cortical MTs in guard cells, whereas the decrease in aperture size in the evening was suppressed by 10 μM tax-ol, which stabilizes cortical MTs. These results suggest that radially-organized cortical MTs of guard cells may control diurnal stomatal movement.

Keywords: Diurnal cycle; Guard cell; Immunofluorescence microscopy; Microtubule; Stomatal aperture; Viciafaba L.

Journal Article.  0 words. 

Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

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