Immunohistochemical analysis of auxin localization during gravimorphogenesis of cucumber seedlings

Chiaki Watanabe, Nobuharu Fujii, Yutaka Miyazawa, Hideyuki Takahashi

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

When cucumber seeds are placed in a horizontal position for germination, resulting seedlings develop a specialized protuberance, termed the peg, on the lower side of the transition zone between the hypocotyl and the root, due to gravistimulation. On the other hand, in our space-flight experiment of STS-95, cucumber seedlings grown under microgravity conditions developed a peg on each side of the transition zone, suggesting that gravistimulation was required for suppressing the peg formation on the upper side of the transition zone. We have shown that auxin induces peg formation. In addition, the decrease in mRNA accumulation of auxin-inducible CsIAAl gene was detected in the upper side of the transition zone of horizontally-grown cucumber seedlings, whereas the decrease in CsIAAl transcript level was not found in the transition zone of space-grown seedlings. We have therefore proposed that gravistimulation induces the decrement of IAA in the upper side of the transition zone and thus suppresses peg formation. However, the auxin distribution in the transition zone during peg formation is still unknown. To reveal the IAA distribution upon gravistimulation in the transition zone, we are now investigating the auxin distribution by immunofluorescence method using anti-IAA monoclonal antibody and will present our recent results.

Original languageEnglish
Title of host publicationInternational Astronautical Federation - 59th International Astronautical Congress 2008, IAC 2008
Pages380-384
Number of pages5
Publication statusPublished - 2008 Dec 1
Event59th International Astronautical Congress 2008, IAC 2008 - Glasgow, United Kingdom
Duration: 2008 Sep 292008 Oct 3

Publication series

NameInternational Astronautical Federation - 59th International Astronautical Congress 2008, IAC 2008
Volume1

Other

Other59th International Astronautical Congress 2008, IAC 2008
Country/TerritoryUnited Kingdom
CityGlasgow
Period08/9/2908/10/3

ASJC Scopus subject areas

  • Space and Planetary Science
  • Aerospace Engineering
  • Astronomy and Astrophysics

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