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Shoot circumnutation and winding movements require gravisensing cells.

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.

journal_name

Proc Natl Acad Sci U S A

journal_title

Proceedings of the National Academy of Sciences of the United States of America

authors

Kitazawa D,Hatakeda Y,Kamada M,Fujii N,Miyazawa Y,Hoshino A,Iida S,Fukaki H,Morita MT,Tasaka M,Suge H,Takahashi H

doi

10.1073/pnas.0504617102

keywords:

subject

Has Abstract

pub_date

2005-12-20 00:00:00

pages

18742-7

issue

51

eissn

0027-8424

issn

1091-6490

pii

0504617102

journal_volume

102

pub_type

杂志文章

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