Abstract
Drought stress occurs frequently and severely as a result of global climate change, and it exerts serious effects on plants. 5-Aminolevulinic acid (5-ALA) plays a crucial role in conferring abiotic stress tolerance in plants. To enhance the drought tolerance of turfgrass and investigate the effects of 5-ALA on antioxidant metabolism and gene expression under drought stress conditions, exogenous 5-ALA was applied by foliar spraying before Kentucky bluegrass (Poa pratensis L.) seedlings were exposed to drought [induced by 10% polyethylene glycol (PEG)] stress for 20 days. 5-ALA pretreatment increased turf quality (TQ) and leaf relative water content (RWC) while reducing reactive oxygen species (ROS) production including H2O2 content and O2 •− generation rate, lipoxygenase (LOX) activity, and malondialdehyde (MDA) content under drought stress. 5-ALA pretreatment maintained ascorbate (AsA) and glutathione (GSH) contents and the ASA/DHA and GSH/GSSG ratios at high levels, and it enhanced the activities of superoxide dismutase (SOD), catalase (CAT), ascorbate peroxidase (APX), glutathione peroxidase (GPX), dehydroascorbate reductase (DHAR), and glutathione reductase (GR), which are crucial for scavenging drought-induced ROS. In addition, 5-ALA upregulated the relative expression levels of Cu/ZnSOD, APX, GPX, and DHAR but downregulated those of CAT and GR under drought stress. These results indicated that the application of 5-ALA might improve turfgrass quality and promote drought tolerance in Kentucky bluegrass through reducing oxidative damage and increasing non-enzyme antioxidant levels and antioxidant enzyme activity at transcriptional and posttranscriptional levels.
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Abbreviations
- 5-ALA:
-
5-Aminolevulinic acid
- APX:
-
Ascorbate peroxidase
- AsA:
-
Ascorbic acid (ascorbate)
- BSA:
-
Bovine serum albumin
- CAT:
-
Catalase
- CDNB:
-
1-Chloro-2,4-dinitrobenzene
- DHA:
-
Dehydroascorbate
- DHAR:
-
Dehydroascorbate reductase
- DTNB:
-
5,5′-Dithio-bis (2-nitrobenzoic acid)
- EDTA:
-
Ethylenediaminetetraacetic acid
- GR:
-
Glutathione reductase
- GSH:
-
Reduced glutathione
- GSSG:
-
Oxidized glutathione
- GPX:
-
Glutathione peroxidase
- LOX:
-
Lipoxygenase
- MDHAR:
-
Monodehydroascorbate reductase
- NADPH:
-
Nicotinamide adenine dinucleotide phosphate
- NTB:
-
2-nitro-5-thiobenzoic acid
- SOD:
-
Superoxide dismutase
- TBA:
-
Thiobarbituric acid
- TCA:
-
Trichloroacetic acid
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This work was funded by National Natural Science Foundation of China (NSFC) (project no. 3131160482).
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Niu, K., Ma, X., Liang, G. et al. 5-Aminolevulinic acid modulates antioxidant defense systems and mitigates drought-induced damage in Kentucky bluegrass seedlings. Protoplasma 254, 2083–2094 (2017). https://doi.org/10.1007/s00709-017-1101-4
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DOI: https://doi.org/10.1007/s00709-017-1101-4