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Open AccessArticle

Spatial and Temporal Calcium Signaling and Its Physiological Effects in Moso Bamboo under Drought Stress

International Center for Bamboo and Rattan, State Forestry and Grassland Administration Key Laboratory of Bamboo and Rattan, Beijing 100102, China
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Forests 2019, 10(3), 224; https://doi.org/10.3390/f10030224
Received: 25 January 2019 / Revised: 21 February 2019 / Accepted: 22 February 2019 / Published: 2 March 2019
(This article belongs to the Special Issue Physiological Responses to Abiotic and Biotic Stress in Forest Trees)
Elevations in cytosolic free calcium concentration constitute a fundamental signal transduction mechanism in plants; however, the particular characteristics of calcium ion (Ca2+) signal occurrence in plants is still under debate. Little is known about how stimulus-specific Ca2+ signal fluctuations are generated. Therefore, we investigated the identity of the Ca2+ signal generation pathways, influencing factors, and the effects of the signaling network under drought stress on Phyllostachys edulis (Carrière) J. Houz. Non-invasive micro testing and laser confocal microscopy technology were used as platforms to detect and record Ca2+ signaling in live root tip and leaf cells of P. edulis under drought stress. We found that Ca2+ signal intensity (absorption capacity) positively correlated with degree of drought stress in the P. edulis shoots, and that Ca2+ signals in different parts of the root tip of P. edulis were different when emitted in response to drought stress. This difference was reflected in the Ca2+ flux and in regional distribution of Ca2+. Extracellular Ca2+ transport requires the involvement of the plasma membrane Ca2+ channels, while abscisic acid (ABA) can activate the plasma membrane Ca2+ channels. Additionally, Ca2+ acted as the upstream signal of H2O2 in the signaling network of P. edulis under drought stress. Ca2+ was also involved in the signal transduction process of ABA, and ABA can promote the production of Ca2+ signals in P. edulis leaves. Our findings revealed the physiological role of Ca2+ in drought resistance of P. edulis. This study establishes a theoretical foundation for research on the response to Ca2+ signaling in P. edulis. View Full-Text
Keywords: Ca2+ signal; drought stress; living cell; Moso Bamboo (Phyllostachys edulis); plasma membrane Ca2+ channels; signal network Ca2+ signal; drought stress; living cell; Moso Bamboo (Phyllostachys edulis); plasma membrane Ca2+ channels; signal network
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Jing, X.; Cai, C.; Fan, S.; Wang, L.; Zeng, X. Spatial and Temporal Calcium Signaling and Its Physiological Effects in Moso Bamboo under Drought Stress. Forests 2019, 10, 224.

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