Shoot circumnutation and winding movements require gravisensing cells

Daisuke Kitazawa, Yasuko Hatakeda, Motoshi Kamada, Nobuharu Fujii, Yutaka Miyazawa, Atsushi Hoshino, Shigeru Iida, Hidehiro Fukaki, Miyo Terao Morita, Masao Tasaka, Hiroshi Suge, Hideyuki Takahashi

Research output: Contribution to journalArticlepeer-review

61 Citations (Scopus)

Abstract

Circumnutation and winding in plants are universal growth movements that allow plants to survive despite their sessile nature. However, the detailed molecular mechanisms controlling these phenomena remain unclear. We previously found that a gravitropic mutant of Japanese morning glory (Pharbitis nil or Ipomoea nil), Shidare-asagao (weeping), is defective not only in circumnutation but also in the winding response. This phenotype is similar to that of the Arabidopsis SCARECROW (SCR) mutant. We therefore investigated whether morning glory SCR (PnSCR) is involved in the weeping phenotype. We found that one amino acid was inserted into the highly conserved VHIID motif in weeping-type PnSCR; this mutation caused abnormal endodermal differentiation. We introduced either the mutant or WT PnSCR into Arabidopsis scr mutants for complementation tests. PnSCR of the WT, but not of weeping, rescued the shoot gravitropism and circumnutation of scr. These results show that both the abnormal gravitropism and the circumnutation defect in weeping are attributable to a loss of PnSCR function. Thus, our data show that gravisensing endodermal cells are indispensable for shoot circumnutation and the winding response and that PnSCR is responsible for the abnormal phenotypes of weeping.

Original languageEnglish
Pages (from-to)18742-18747
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Volume102
Issue number51
DOIs
Publication statusPublished - 2005 Dec 20

Keywords

  • Arabidopsis
  • Gravitropic mutant
  • Gravity sensing
  • Morning glory
  • SCARECROW

ASJC Scopus subject areas

  • General

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