Abstract
The effects of foliar spraying with spermidine (Spd) on antioxidant system in tomato (Lycopersicon esculentum Mill.) seedlings were investigated under high temperature stress. The high temperature stress significantly inhibited plant growth and reduced chlorophyll (Chl) content. Application of exogenous 1 mM Spd alleviated the inhibition of growth induced by the high temperature stress. Malondialdehyde (MDA), hydrogen peroxide (H2O2) content and superoxide anion (O2) generation rate were significantly increased by the high temperature stress, but Spd significantly reduced the accumulation of reactive oxygen species (ROS) and MDA content under the stress. The high temperature stress significantly decreased glutathione (GSH) content and activities of superoxide dismutase (SOD), peroxidase (POD), catalase (CAT), ascorbate peroxidase (APX), glutathione reductase (GR), monodehydroascorbate reductase (MDHAR) and dehydroascorbate reductase (DHAR), but increased contents of dehydroascorbic acid (DHA), ascorbic acid (AsA), and oxidized glutathione (GSSG) in tomato leaves. However, Spd significantly increased the activities of antioxidant enzymes, levels of antioxidants and endogenous polyamines in tomato leaves under the high temperature stress. In addition, to varying degrees, Spd regulated expression of MnSOD, POD, APX2, APX6, GR, MDHAR, DHAR1, and DHAR2 genes in tomato leaves exposed to the high temperature stress. These results suggest that Spd could change endogenous polyamine levels and alleviate the damage by oxidative stress enhancing the non-enzymatic and enzymatic antioxidant system and the related gene expression.
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Abbreviations
- APX:
-
ascorbate peroxidase
- AsA:
-
ascorbic acid
- CAT:
-
catalase
- Chl:
-
chlorophyll
- DHA:
-
dehydroascorbate
- GR:
-
glutathione reductase
- GSH:
-
reduced glutathione
- GSSG:
-
oxidized glutathione
- H2O2 :
-
hydrogen peroxide
- MDA:
-
malondialdehyde
- Pas:
-
polyamines
- POD:
-
peroxidase
- Put:
-
putrescine
- SOD:
-
superoxide dismutase
- Spd:
-
spermidine
- Spm:
-
spermine
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Sang, Q.Q., Shu, S., Shan, X. et al. Effects of exogenous spermidine on antioxidant system of tomato seedlings exposed to high temperature stress. Russ J Plant Physiol 63, 645–655 (2016). https://doi.org/10.1134/S1021443716050113
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DOI: https://doi.org/10.1134/S1021443716050113