Responses of Parameters for Electrical Impedance Spectroscopy and Pressure-Volume Curves to Drought Stress in Pinus bungeana Seedlings

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Wang , A-F , Di , B , Repo , T , Roitto , M & Zhang , G 2020 , ' Responses of Parameters for Electrical Impedance Spectroscopy and Pressure-Volume Curves to Drought Stress in Pinus bungeana Seedlings ' , Forests , vol. 11 , no. 3 , 359 . https://doi.org/10.3390/f11030359

Title: Responses of Parameters for Electrical Impedance Spectroscopy and Pressure-Volume Curves to Drought Stress in Pinus bungeana Seedlings
Author: Wang, Ai-Fang; Di, Bao; Repo, Tapani; Roitto, Marja; Zhang, Gang
Contributor: University of Helsinki, Ruralia Institute, Mikkeli
Date: 2020-03
Language: eng
Number of pages: 14
Belongs to series: Forests
ISSN: 1999-4907
URI: http://hdl.handle.net/10138/315750
Abstract: Background and Objectives: Drought occurs more frequently in Northern China with the advent of climate change, which might increase the mortality of tree seedlings after afforestation due to hydraulic failure. Therefore, investigating water relations helps us understand the drought tolerance of tree seedlings. Electrical impedance spectroscopy (EIS) is widely used to assess the responses of plant tissues to stress factors and may potentially reveal the water relations of cells. The aim of this study is to reveal the relationships between EIS and water related parameters, produced by pressure-volume (PV) curves in lacebark pine (Pinus bungeanaZucc.) seedlings reacting to drought stress. Materials and Methods: Four-year-old pot seedlings were divided into three parts (0, 5, and 10 days of drought) before planting, the treated seedlings were then replanted, and finally exposed to post-planting drought treatments with the following soil relative water contents: (i) adequate irrigation (75%-80%), (ii) light drought (55%-60%), (iii) moderate drought (35%-40%), and (iv), severe drought (15%-20%). During the post-planting growth phase, the EIS parameters of needles and shoots, and the parameters of PV curves, were measured coincidently; thus, the correlations between them could be obtained. Results: The extracellular resistance (r(e)) of needles and shoots were substantially reduced after four weeks of severe post-planting drought stress. Meanwhile, the osmotic potential at the turgor-loss point (psi(tlp)) and the saturation water osmotic potential (psi(sat)) of shoots decreased after drought stress, indicating an osmotic adjustment in acclimating to drought. The highest correlations were found between the intracellular resistance (r(i)) of the shoots and psi(tlp) and psi(sat). Conclusions: EIS parameters can be used as a measure of drought tolerance. The change in intracellular resistance is related to the osmotic potential of the cell and cell wall elasticity. Extracellular resistance is a parameter that shows cell membrane damage in response to drought stress in lacebark pine seedlings.
Subject: cell wall elasticity
drought tolerance
extracellular resistance
intracellular resistance
osmotic adjustment
CELL-WALL ELASTICITY
WATER RELATIONS
OSMOTIC ADJUSTMENT
SHOOTS
ROOTS
TOLERANCE
GROWTH
TISSUE
PLANTS
TREES
4112 Forestry
1182 Biochemistry, cell and molecular biology
11831 Plant biology
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