A role of cytoskeletal structure of cortical cells in the gravity-regulated formation of a peg in cucumber seedlings

M. Kobayashi, T. Murata, N. Fujii, M. Yamashita, A. Higashitani, H. Takahashi

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

Seedlings of cucurbitaceous plants develop a protuberant tissue, or peg, on the lower side of the transition region between root and hypocotyl when germinated in a horizontal position. Peg develops due to a change in growth polarity of the cortical cells. We have examined the role of the cytoskeketal structure in peg formation of cucumber seedlings. We observed that in both peg and normal cortical cells of 36 h-old seedlings the microtubules (MTs) were arranged perpendicular to the longitudinal axis of the elongating cells. Application of colchicine perturbed the MTs structure and inhibited the formation of pegs. In 20 h-old seedlings, MTs in cortical cells destined to be a peg tissue had no preferential organization, whereas MTs in normal cortical cells were transversely oriented. After 24 h, the MTs in future peg cells were arranged similar to those of 36 h-old seedlings, although the initiation of peg tissue was not yet visible. These results suggest that reorganization of MTs is required for peg formation and causes the change in growth polarity of the cortical cells.

Original languageEnglish
Pages (from-to)771-773
Number of pages3
JournalAdvances in Space Research
Volume24
Issue number6
DOIs
Publication statusPublished - 1999 Jan 1

ASJC Scopus subject areas

  • Aerospace Engineering
  • Astronomy and Astrophysics
  • Geophysics
  • Atmospheric Science
  • Space and Planetary Science
  • Earth and Planetary Sciences(all)

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