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Research paper | Open Access

Maintenance of mesophyll potassium and regulation of plasma membrane H+-ATPase are associated with physiological responses of tea plants to drought and subsequent rehydration

Xianchen Zhanga,1, Honghong Wub,1, Linmu Chena, Linlin Liua, Xiaochun Wana,( )
State Key Laboratory of Tea Plant Biology and Utilization, Anhui Agricultural University, Hefei 230036, Anhui, China
Department of Botany and Plant Sciences, University of California, Riverside, CA 92527, USA

1 These authors contributed equally to this work.

Peer review under responsibility of Crop Science Society of China and Institute of Crop Science, CAAS.

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Abstract

Drought stress is one of the main factors limiting yield in tea plants. The plant cell's ability to preserve K+ homeostasis is an important strategy for coping with drought stress. Plasma membrane H+-ATPase in the mesophyll cell is important for maintaining membrane potential to regulate K+ transmembrane transport. However, no research to date has investigated the possible relationship between plasma membrane H+-ATPase and mesophyll K+ retention in tea plants under drought and subsequent rehydration conditions. In our experiment, drought stress inhibited plasma membrane H+-ATPase activities and induced net H+ influx, leading to membrane potential depolarization and inducing a massive K+ efflux in tea plant mesophyll cells. Subsequent rehydration increased plasma membrane H+-ATPase activity and induced net H+ efflux, leading to membrane potential hyperpolarization and thus lowering K+ loss. A first downregulated and then upregulated plasma membrane H+-ATPase protein expression level was also observed under drought and subsequent rehydration treatment, a finding in agreement with the change of measured plasma membrane H+-ATPase activities. Taken together, our results suggest that maintenance of mesophyll K+ in tea plants under drought and rehydration is associated with regulation of plasma membrane H+-ATPase activity.

Keywords

Drought stressPotassiumMembrane potentialRehydrationH+-ATPase

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The Crop Journal
Volume 6 Issue 6,
December 2018
Pages 611-620
DOI: 10.1016/j.cj.2018.06.001
Cite this article:
Zhang X, Wu H, Chen L, et al. Maintenance of mesophyll potassium and regulation of plasma membrane H+-ATPase are associated with physiological responses of tea plants to drought and subsequent rehydration. The Crop Journal, 2018, 6(6): 611-620. https://doi.org/10.1016/j.cj.2018.06.001

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Received: 06 March 2018
Revised: 09 June 2018
Accepted: 16 July 2018
Published: 27 July 2018
© 2018 “Crop Science Society of China and Institute of Crop Science, CAAS”.
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