Journal
CROP JOURNAL
Volume 6, Issue 6, Pages 611-620Publisher
KEAI PUBLISHING LTD
DOI: 10.1016/j.cj.2018.06.001
Keywords
Drought stress; H+-ATPase; Membrane potential; Potassium; Rehydration
Categories
Funding
- Science Foundation for Anhui Province [KJ2017A126]
- Opening Fund of State Key Lab of Tea Plants Biology and Utilization at Anhui Agricultural University [SKLTOF20170112]
- National Natural Science Foundation of China [11008389]
- National Basic Research Program of China [11000206]
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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. (C) 2018 Crop Science Society of China and Institute of Crop Science, CAAS.
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