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Antioxidant Enzymatic Activity and Osmotic Adjustment as Components of the Drought Tolerance Mechanism in Carex duriuscula

文献类型： 外文期刊

作者： Hou, Peichen 1 ; Wang, Feifei 3 ; Luo, Bin 1 ; Li, Aixue 1 ; Wang, Cheng 1 ; Shabala, Lana 2 ; Ahmed, Hassan Ahmed Ibr 1 ;

作者机构： 1.Beijing Acad Agr & Forestry Sci, Beijing Res Ctr Intelligent Equipment Agr, Beijing 100097, Peoples R China

2.Univ Tasmania, Tasmanian Inst Agr, Hobart, Tas 7001, Australia

3.Yangzhou Univ, Jiangsu Key Lab Crop Genet & Physiol, Coinnovat Ctr Modern Prod Technol Grain Crops,Col, Key Lab Plant Funct Genom,Minist Educ,Jiangsu Key, Yangzhou 225009, Jiangsu, Peoples R China

4.Foshan Univ, Int Res Ctr Environm Membrane Biol, Foshan 528011, Peoples R China

5.Port Said Univ, Fac Sci, Dept Bot, Port Said 42526, Egypt

6.Chinese Acad Forestry, Res Inst Forestry, State Key Lab Tree Genet & Breeding, Beijing 100091, Peoples R China

7.Chinese Acad Forestry, Tianjin Res Inst Forestry, Tianjin 300000, Peoples R China

8.Huazhong Agr Univ, Coll Plant Sci & Technol, Wuhan 430070, Peoples R China

关键词： Carex duriuscula; drought tolerance; ROS; antioxidant enzyme; ion concentration; osmotic adjustment; energy cost

期刊名称：PLANTS-BASEL （ 影响因子：2.762； ）

ISSN：

年卷期： 2021 年 10 卷 3 期

页码：

收录情况： SCI

摘要： Drought stress is a major environmental constraint for plant growth. Climate-change-driven increases in ambient temperatures resulted in reduced or unevenly distributed rainfalls, leading to increased soil drought. Carex duriuscula C. A. Mey is a typical drought-tolerant sedge, but few reports have examined the mechanisms conferring its tolerant traits. In the present study, the drought responses of C. duriuscula were assessed by quantifying activity of antioxidant enzymes in its leaf and root tissues and evaluating the relative contribution of organic and inorganic osmolyte in plant osmotic adjustment, linking it with the patterns of the ion acquisition by roots. Two levels of stress-mild (MD) and severe (SD) drought treatments-were used, followed by re-watering. Drought stress caused reduction in a relative water content and chlorophyll content of leaves; this was accompanied by an increase in the hydrogen peroxide (H2O2) and superoxide (O-2(-)) contents in leaves and roots. Under MD stress, the activities of catalase (CAT), peroxidase (POD), and glutathione peroxidase (GPX) increased in leaves, whereas, in roots, only CAT and POD activities increased. SD stress led to an increase in the activities of CAT, POD, superoxide dismutase (SOD), and GPX in both tissues. The levels of proline, soluble sugars, and soluble proteins in the leaves also increased. Under both MD and SD stress conditions, C. duriuscula increased K+, Na+, and Cl- uptake by plant roots, which resulted in an increased K+, Na+, and Cl- concentrations in leaves and roots. This reliance on inorganic osmolytes enables a cost-efficient osmotic adjustment in C. duriuscula. Overall, this study revealed that C. duriuscula was able to survive arid environments due to an efficient operation of its ROS-scavenging systems and osmotic adjustment mechanisms.

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