Physiological Regulation Mechanism of Tea Tree in Response to Drought Mesophyll Cells

In early 2018, tea biological resources and Anhui Agricultural University State Key Laboratory Director, Professor Wan Xiaochun research group, for tea leaf cells plasma membrane H + -ATPase regulation of potassium homeostasis research in drought and rehydration conditions in The Crop The results of the study entitled Maintenance of mesophyll potassium and regulation of plasma membrane H + -ATPase areassociated with physiological responses of teaplants to drought and subsequent rehydration. This is the first use of Non-invasive Micro-test Technology (NMT) to combine ion current with membrane potential data for the first time to determine the H + , K + and membrane potential of tea leaf flesh cells, revealing the tea tree in drought and complex Changes in physiological mechanisms under water treatment. Dr. Zhang Xianchen is the first author of this article.
Detection of H + flow and K + flow in living mesophyll cells.
Under the conditions of drought and rehydration, the tea tree K + flow changes in mesophyll cells. Positive values ​​represent the efflux.


Drought damage seriously affects the growth and development of tea trees, resulting in reduced yield and quality of tea. Revealing the drought-resistance mechanism of tea trees has important theoretical significance for cultivating drought-tolerant tea varieties and coping with drought stress.

The research group used tea leaves as a research object to simulate drought and hydration irrigation through PEG and rehydration. Drought inhibits the plasma membrane H + -ATPase activity of tea leaves, induces H + influx, mediates membrane potential depolarization, activates K + efflux, and weakens the retention of K + in mesophyll cells; rehydration activates the plasma membrane of tea leaf flesh H + -ATPase activity, exacerbated H + efflux, hyperpolarized membrane potential, inhibited K + efflux, and promoted the retention of K + in mesophyll cells. Therefore, it is speculated that leaf plasma membrane H + -ATPase may be involved in the regulation of potassium homeostasis in tea leaves in response to drought and rehydration.


Change of cell membrane potential of mesophyll under the condition of drought and rehydration

The first author of this article, Dr. Zhang Xianchen from the State Key Laboratory of Tea Biology and Resource Utilization, has been focusing on tea tree stress research, and has used non-invasive micro-measurement technology in the fluorine enrichment of tea trees, drought stress, acid stress, aluminum stress, etc. , published 3 SCI articles and 1 Chinese core article.

Efficient iron plaque formation on tea(Camellia sinensis) roots contributes to acidic stress tolerance. JIntegr Plant Biol . 2018, doi: 10.1111/jipb.12702.

Maintenance of mesophyll potassium andregulation of plasma membrane H + -ATPase are associated with physiologicalresponses of tea plants to drought and subsequent. Crop J . 2018,6(6):611-620.

Al 3+ -promoted fluorideaccumulation in tea plants (Camellia sinensis) was inhibited by an anionchannel inhibitor DIDS. J Sci Food Agric . 2016, 96(12): 4224-30.

The effect of Ca 2+ on the inhibition of fluoride absorption by tea trees in DIDS ( 4,4-diisothiocyanate-2,2-disulfonic acid). Journal of Nanjing Agricultural University.2016.


The first author of this article, Dr. Zhang Xianchen of Anhui Agricultural University, interviewed by Zhongguancun NMT Alliance

Thanks

Thanks to Dr. Zhang Xianchen for his contribution.

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