Annexin 1 Is a Component of eATP-Induced Cytosolic Calcium Elevation in <i>Arabidopsis thaliana</i> Roots
Extracellular ATP (eATP) has long been established in animals as an important signalling molecule but this is less understood in plants. The identification of <i>Arabidopsis thaliana</i> DORN1 (Does Not Respond to Nucleotides) as the first plant eATP receptor has shown that it is fundame...
Main Authors: | , , , , , , , |
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Format: | Article |
Language: | English |
Published: |
MDPI AG
2021-01-01
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Series: | International Journal of Molecular Sciences |
Subjects: | |
Online Access: | https://www.mdpi.com/1422-0067/22/2/494 |
Summary: | Extracellular ATP (eATP) has long been established in animals as an important signalling molecule but this is less understood in plants. The identification of <i>Arabidopsis thaliana</i> DORN1 (Does Not Respond to Nucleotides) as the first plant eATP receptor has shown that it is fundamental to the elevation of cytosolic free Ca<sup>2+</sup> ([Ca<sup>2+</sup>]<sub>cyt</sub>) as a possible second messenger. eATP causes other downstream responses such as increase in reactive oxygen species (ROS) and nitric oxide, plus changes in gene expression. The plasma membrane Ca<sup>2+</sup> influx channels involved in eATP-induced [Ca<sup>2+</sup>]<sub>cyt</sub> increase remain unknown at the genetic level. <i>Arabidopsis thaliana</i> Annexin 1 has been found to mediate ROS-activated Ca<sup>2+</sup> influx in root epidermis, consistent with its operating as a transport pathway. In this study, the loss of function Annexin 1 mutant was found to have impaired [Ca<sup>2+</sup>]<sub>cyt</sub> elevation in roots in response to eATP or eADP. Additionally, this annexin was implicated in modulating eATP-induced intracellular ROS accumulation in roots as well as expression of eATP-responsive genes. |
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ISSN: | 1661-6596 1422-0067 |