Abstract
Salt stress is abiotic stress that negatively impacts plant growth. Exogenous spermidine (SPD) has been proposed as a priming agent that effectively alleviates various abiotic stresses in plants. To evaluate the alleviation role of exogenous SPD application against salt stress, we studied the physiological and biochemical changes, and the expression of gene encoding antioxidant enzymes and phytohormones in the SPD-treated pecan-grafted seedling. The results revealed that for the seedlings growing under salt stress environment, a drop in the total chlorophyll content and photosynthetic capability was observed. These effects subsided when the seedlings were treated with SPD. Moreover, the malondialdehyde level and Na+/K+ ratio, as well as the damage of the chloroplast ultrastructure in the seedlings, were markedly suppressed after SPD treatment. Compared with the non-SPD-treated counterparts, the exogenous SPD application promoted higher antioxidant enzyme activities and their corresponding gene expression. At the same time, the induction of abscisic acid and ethylene was suppressed. The results indicate that the exogenous SPD plays a vital role in alleviating salt-incurred phytotoxicity and oxidative damage in pecan-grafted seedlings. The remissive role of exogenous SPD is implicated by its interplay with the expression of the antioxidant enzymes and phytohormones in the pecan-grafted seedlings.
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Abbreviations
- ABA:
-
Abscisic acid
- CAT:
-
Catalase
- Chl:
-
Chlorophyll
- DAT:
-
Day after treatment
- ETH:
-
Ethylene
- Fv/Fm :
-
Maximum quantum yield of PSII photochemistry
- MDA:
-
Malondialdehyde
- PA:
-
Polyamine
- Pn:
-
Net photosynthetic rate
- POD:
-
Peroxidase
- PVP:
-
Polyvinylpyrrolidone
- SPD:
-
Spermidine
- SPM:
-
Spermine
- SOD:
-
Superoxide dismutase
- TCA:
-
Trichloroacetic acid
- TBA:
-
Thiobarbituric acid
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Acknowledgements
This study was supported by National Key Research and Development Program of China (2018YFD1000600, 2018YFD1000604); Key Project of Zhejiang Provincial Natural Science Foundation (LZ18C160001); Independent Research Project of State Key Laboratory of Subtropical Silviculture, Zhejiang A & F University (ZY20180208, ZY20180308); Key Research and Development Program of Zhejiang Province (2018C02004); National Natural Science Foundation of China (31470683, 31270716 and 31070604); National High Technology Research and Development Program of China (863 Program) (2013AA102605); Open Foundation of State Key Laboratory of Subtropical Silviculture, Zhejiang A & F University (KF201708); Fruit Innovation Team Project of Zhejiang Province (2016C02052-12); Key Agricultural New Varieties Breeding Projects founded by Zhejiang Province Science and Technology Department (2016C02052-13); Open Foundation of First-class Discipline of Forestry, Zhejiang Province (201703); National Undergraduate Innovation and Entrepreneurship Training Project (201610341010); Undergraduate Science and Technology Innovation Plan of Zhejiang Province (2017R412006); Undergraduate Research Training Program in Zhejiang A & F University (KX20180047, KX20180043, KX20180065).
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Wu, Z., Wang, J., Yan, D. et al. Exogenous spermidine improves salt tolerance of pecan-grafted seedlings via activating antioxidant system and inhibiting the enhancement of Na+/K+ ratio. Acta Physiol Plant 42, 83 (2020). https://doi.org/10.1007/s11738-020-03066-4
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DOI: https://doi.org/10.1007/s11738-020-03066-4