Exogenous 2-(3,4-Dichlorophenoxy) triethylamine alleviates salinity stress in maize by enhancing photosynthetic capacity, improving water status and maintaining K+/Na+ homeostasis
Autor: | Shi Wei, Lijie Li, Wanrong Gu, Wenhua Li, Liguo Zhang, Shiyu Zuo, Chunrong Qian, Xichang Chen, Congfeng Li, Zhenhua Wang |
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Rok vydání: | 2020 |
Předmět: |
Chlorophyll
0106 biological sciences 0301 basic medicine Soil salinity Photosystem II Ion homeostasis Plant Science Biology Photosynthesis Plant Roots Salt Stress Zea mays 01 natural sciences 03 medical and health sciences Salinity stress Nutrient Gene Expression Regulation Plant lcsh:Botany Ethylamines Homeostasis Plant Proteins Sodium Water Salt Tolerance Photosynthetic capacity lcsh:QK1-989 Plant Leaves Salinity Horticulture 030104 developmental biology Potassium DCPTA Research Article Water status 010606 plant biology & botany |
Zdroj: | BMC Plant Biology, Vol 20, Iss 1, Pp 1-16 (2020) BMC Plant Biology |
Popis: | Background Soil salinity restricts plant growth and productivity. 2-(3,4-dichlorophenoxy) triethylamine (DCPTA) can alleviate salinity stress in plants. However, the mechanism of DCPTA-mediated salinity tolerance has not been fully clarified. We aimed to investigate its role in enhancing photosynthetic capacity, improving water status, maintaining K+/Na+ homeostasis and alleviating salinity stress in maize (Zea mays L.). Results In present study, maize seedlings were grown in nutrient solutions with a combination of NaCl (0, 150 mM) and DCPTA (0, 20, 100, and 400 μM). And photosynthesis, water status, ion homeostasis and the expression of genes involved in ion uptake and transport were evaluated in the maize seedlings. The results demonstrated that DCPTA alleviated the growth inhibition of maize seedlings exposed to salinity stress by increasing the net photosynthetic rate (Pn) and the quantum efficiency of photosystem II (PSII) photochemistry. DCPTA improved the root hydraulic conductivity, which help maintained the water status. A relatively high K+ concentration but a relatively low Na+ concentration and the Na+/K+ ratio were observed in the presence of DCPTA under salinity stress. Additionally, DCPTA altered the expression of four genes (ZmSOS1, ZmHKT1, ZmNHX1 and ZmSKOR) that encode membrane transport proteins responsible for K+/Na+ homeostasis. Conclusions DCPTA improved the salinity tolerance of maize may be associated with enhanced photosynthetic capacity, maintenance of water status and altered expression of genes involved in ion uptake and transport. |
Databáze: | OpenAIRE |
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