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The Role of Auxin Transport and Distribution in Plant Gravimorphogenesis

  • Chiaki Yamazaki
  • Nobuharu Fujii
  • Hideyuki TakahashiEmail author
Chapter
Part of the Signaling and Communication in Plants book series (SIGCOMM, volume 17)

Abstract

Auxin is one of plant hormones that regulate various aspects of plant growth and development. It has long been proposed that auxin redistribute in response to gravity, which regulates gravimorphogenesis in plants. Recent molecular genetic analysis of Arabidopsis thaliana demonstrated that the gravity-regulated auxin redistribution is brought by auxin transport mediated by auxin efflux carriers. On the other hand, we have shown that the gravity-regulated morphogenesis, peg formation, of cucurbit seedlings is also controlled by auxin redistribution. Namely, cucumber (Cucumis sativus L.) seedlings have ability to develop a peg on each side of the transition zone between hypocotyl and root but develop one peg on the lower flank of the gravistimulated transition zone because its development on the upper flank is suppressed when the seedlings were grown in a horizontal position. The peg suppression occurs due to a reduction of auxin level on the upper flank. This auxin redistribution appears to involve a cucumber auxin efflux carrier CsPIN1 whose localization changes in response to gravistimulation. Here, we attempt to compare the mechanisms for gravimorphogenesis of cucumber seedlings and for gravity response in Arabidopsis seedlings.

Keywords

Transition Zone Auxin Transport Elongation Zone Auxin Response Factor Endodermal Cell 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgment

This work was supported by Research Fellowship for Young Scientists from the Japan Society for the Promotion of Science (JSPS) to C.Y. and Grants-in-Aid for Scientific Research on Priority Areas (no. 19039005) and Grants-in-Aid for Scientific Research on Innovative Areas (no. 22120004) from the Ministry of Education, Culture, Sports, Science and Technology of Japan (MEXT) to H.T. This work was also carried out as a part of the Global COE Program J03 (Ecosystem Management Adapting to Global Change) of MEXT and the Research Working Group Program of the Japan Aerospace Exploration Agency (JAXA).

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© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • Chiaki Yamazaki
    • 1
    • 2
  • Nobuharu Fujii
    • 1
  • Hideyuki Takahashi
    • 1
    Email author
  1. 1.Graduate School of Life SciencesTohoku UniversityAoba-kuJapan
  2. 2.Kihara Institute of Biological ResearchYokohama City UniversityTotsukaJapan

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