Genetic evidence that the endodermis is essential for shoot gravitropism in Arabidopsis thaliana.

Published

Journal Article

Shoots of higher plants exhibit negative gravitropism. However, little is known about the mechanism or site of gravity perception in shoots. We have identified two loci that are essential for normal shoot gravitropism in Arabidopsis thaliana. Genetic analysis demonstrated that the shoot gravitropism mutants sgr1 and sgr7 are allelic to the radial pattern mutants, scr and shr, respectively. Characterization of the aerial phenotype of these mutants revealed that the primary defect is the absence of a normal endodermis in hypocotyls and influorescence stems. This indicates that the endodermis is essential for shoot gravitropism and strongly suggests that this cell layer functions as the gravity-sensing cell layer in dicotyledonous plant shoots. These results also demonstrate that, in addition to their previously characterized role in root radial patterning, SCR and SHR regulate the radial organization of the shoot axial organs in Arabidopsis.

Full Text

Duke Authors

Cited Authors

  • Fukaki, H; Wysocka-Diller, J; Kato, T; Fujisawa, H; Benfey, PN; Tasaka, M

Published Date

  • May 1998

Published In

Volume / Issue

  • 14 / 4

Start / End Page

  • 425 - 430

PubMed ID

  • 9670559

Pubmed Central ID

  • 9670559

Electronic International Standard Serial Number (EISSN)

  • 1365-313X

International Standard Serial Number (ISSN)

  • 0960-7412

Digital Object Identifier (DOI)

  • 10.1046/j.1365-313x.1998.00137.x

Language

  • eng