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外源 2-(3,4-二氯苯氧基)三乙胺通过增强光合作用能力、改善水分状况和维持 K/Na 平衡来缓解玉米的盐胁迫。

Exogenous 2-(3,4-Dichlorophenoxy) triethylamine alleviates salinity stress in maize by enhancing photosynthetic capacity, improving water status and maintaining K/Na homeostasis.

机构信息

College of Agriculture, Northeast Agricultural University, Harbin, 150030, P. R. China.

College of Life Science and Technology, Henan Institute of Science and Technology, Xinxiang, 453000, Henan, P. R. China.

出版信息

BMC Plant Biol. 2020 Jul 23;20(1):348. doi: 10.1186/s12870-020-02550-w.

DOI:10.1186/s12870-020-02550-w
PMID:32703161
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7376668/
Abstract

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 (P) 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.

摘要

背景

土壤盐度会限制植物的生长和生产力。2-(3,4-二氯苯氧基)三乙胺（DCPTA）可以缓解植物的盐胁迫。然而，DCPTA 介导的耐盐机制尚未完全阐明。我们旨在研究其在提高玉米（Zea mays L.）光合作用能力、改善水分状况、维持 K/Na 平衡和缓解盐胁迫中的作用。

结果

本研究在含有 NaCl（0、150mM）和 DCPTA（0、20、100 和 400μM）组合的营养液中培养玉米幼苗，并评估了玉米幼苗的光合作用、水分状况、离子平衡以及参与离子吸收和转运的基因的表达。结果表明，DCPTA 通过增加净光合速率（P）和光系统 II（PSII）光化学量子效率来缓解盐胁迫对玉米幼苗生长的抑制。DCPTA 提高了根水力传导性，有助于维持水分状况。在盐胁迫下，DCPTA 存在时观察到相对较高的 K 浓度、相对较低的 Na 浓度和 Na/K 比值。此外，DCPTA 改变了编码负责 K/Na 平衡的膜转运蛋白的四个基因（ZmSOS1、ZmHKT1、ZmNHX1 和 ZmSKOR）的表达。

结论

DCPTA 提高了玉米的耐盐性，可能与增强的光合作用能力、水分状况的维持以及参与离子吸收和转运的基因的表达改变有关。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fe58/7376668/6329f2702f27/12870_2020_2550_Fig9_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fe58/7376668/3a3dc6398aa3/12870_2020_2550_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fe58/7376668/e4eeab40942b/12870_2020_2550_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fe58/7376668/7fdb1cc16dc1/12870_2020_2550_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fe58/7376668/03dba69dc3aa/12870_2020_2550_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fe58/7376668/1500bda30984/12870_2020_2550_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fe58/7376668/0332a72fcce0/12870_2020_2550_Fig6_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fe58/7376668/29618060a686/12870_2020_2550_Fig7_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fe58/7376668/dc9563182509/12870_2020_2550_Fig8_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fe58/7376668/6329f2702f27/12870_2020_2550_Fig9_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fe58/7376668/3a3dc6398aa3/12870_2020_2550_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fe58/7376668/e4eeab40942b/12870_2020_2550_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fe58/7376668/7fdb1cc16dc1/12870_2020_2550_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fe58/7376668/03dba69dc3aa/12870_2020_2550_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fe58/7376668/1500bda30984/12870_2020_2550_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fe58/7376668/0332a72fcce0/12870_2020_2550_Fig6_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fe58/7376668/29618060a686/12870_2020_2550_Fig7_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fe58/7376668/dc9563182509/12870_2020_2550_Fig8_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fe58/7376668/6329f2702f27/12870_2020_2550_Fig9_HTML.jpg

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