Journal Article

Gravitropism in Leaves of <i>Arabidopsis thaliana</i> (L.) Heynh.

Eriko Mano, Gorou Horiguchi and Hirokazu Tsukaya

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 47, issue 2, pages 217-223
Published in print February 2006 | ISSN: 0032-0781
Published online February 2006 | e-ISSN: 1471-9053 | DOI: https://dx.doi.org/10.1093/pcp/pci237
Gravitropism in Leaves of Arabidopsis thaliana (L.) Heynh.

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In higher plants, stems and roots show negative and positive gravitropism, respectively. However, current knowledge on the graviresponse of leaves is lacking. In this study, we analyzed the positioning and movement of rosette leaves of Arabidopsis thaliana under light and dark conditions. We found that the radial positioning of rosette leaves was not affected by the direction of gravity under continuous white light. In contrast, when plants were shifted to darkness, the leaves moved upwards, suggesting negative gravitropism. Analysis of the phosphoglucomutase and shoot gravitropism 2–1 mutants revealed that the sedimenting amyloplasts in the leaf petiole are important for gravity perception, as is the case in stems and roots. In addition, our detailed physiological analyses revealed a unique feature of leaf movement after the shift to darkness, i.e. movement could be divided into negative gravitropism and nastic movement. The orientation of rosette leaves is ascribed to a combination of these movements.

Keywords: Amyloplast; Arabidopsis thaliana; Gravitropism; Petiole; Shoot axis dependent; N-position, normal position; R-position, reversed position

Journal Article.  4749 words.  Illustrated.

Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

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