Calcium mobilizations in response to changes in the gravity vector in Arabidopsis seedlings: possible cellular mechanisms

Plant Signaling & Behavior
H TatsumiM Sokabe

Abstract

Gravity influences the growth direction of higher plants. Changes in the gravity vector (gravistimulation) immediately promote the increase in the cytoplasmic free calcium ion concentration ([Ca(2+)]c) in Arabidopsis (Arabidopsis thaliana) seedlings. When the seedlings are gravistimulated by reorientation at 180°, a transient two peaked (biphasic) [Ca(2+)]c-increase arises in their hypocotyl and petioles. Parabolic flights (PFs) can generate a variety of gravity-stimuli, and enables us to measure gravity-induced [Ca(2+)]c-increases without specimen rotation, which demonstrate that Arabidopsis seedlings possess a rapid gravity-sensing mechanism linearly transducing a wide range of gravitational changes into Ca(2+) signals on a sub-second timescale. Hypergravity by centrifugation (20 g or 300 g) also induces similar transient [Ca(2+)]c-increases. In this review, we propose models for possible cellular processes of the garavi-stimulus-induced [Ca(2+)]c-increase, and evaluate those by examining whether the model fits well with the kinetic parameters derived from the [Ca(2+)]c-increases obtained by applying gravistimulus with different amplitudes and time sequences.

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Citations

Nov 26, 2015·Biological Procedures Online·Shaomin Yan, Guang Wu
Jun 27, 2017·NPJ Microgravity·Donat-P HäderRuth Hemmersbach
Mar 11, 2020·Frontiers in Plant Science·Lucius Wilhelminus Franciscus MuthertGiovanna Aronne
Oct 3, 2020·Plants·Shih-Heng SuPatrick H Masson
Apr 15, 2021·Plant Biotechnology·Yoshinori AbeMasatsugu Toyota
Jul 14, 2021·The New Phytologist·Huibin HanJiří Friml

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