Abstract
Aim
To study the effects of multi-occurring stresses and the underlying mechanisms of cross-stress tolerance.
Methods
Wheat plants were exposed to moderate drought priming (the leaf water potential reached ca. -0.8 MPa) at the 5-6th leaf stage for 2 weeks, and the physiological and yield responses of the drought-primed and non-primed plants to low temperature stress (4/ 2 °C in the day/ night for 2 days) at jointing stage were investigated.
Results
Under low temperature stress, the primed plants possessed higher leaf relative water content and much activated antioxidant system and hence reduced the oxidative injury to the photosynthetic apparatus, resulting in greater photosynthetic rate and higher grain yield as compared with the non-primed plants. In addition, increase of the ABA concentrations in leaf was found closely associated with the enhanced anti-oxidant enzymes activity in the primed plants.
Conclusions
Drought priming at vegetative stage improves cold tolerance of wheat at jointing stage via sustaining ROS homeostasis, during which ABA plays a key role in alleviating the effects of low temperature stress in the drought-primed plants.
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Abbreviations
- ABA:
-
abscisic acid
- ANOVA:
-
analysis of variance
- A n :
-
net photosynthetic rate
- APX:
-
ascorbate peroxidase
- A sat :
-
saturate net photosynthetic rate
- CAT:
-
catalase
- CCI:
-
chlorophyll content index
- Ci :
-
intercellular CO2 concentrations
- FAA:
-
free amino acid
- Fv/Fm :
-
maximum quantum efficiency of photosystem II
- GPX:
-
glutathione peroxidase
- g s :
-
stomatal conductance
- H2O2 :
-
hydrogen peroxide
- J max :
-
maximum photosynthetic electron transport rate
- NBT:
-
nitroblue tetrazolium
- 1O2 :
-
singlet oxygen
- PPFD:
-
photo-synthetic photon flux density
- ROS:
-
reactive oxygen species
- RSWC:
-
relative soil water content
- SOD:
-
superoxide dismutase
- TSS:
-
total soluble sugars
- Vc max :
-
maximum carboxylation velocity of Rubisco
- Ψl :
-
leaf water potential
- Ψo :
-
osmotic potential
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Acknowledgments
X. L. thanks the China Scholarship Council for supporting his research stay in the Faculty of Science, University of Copenhagen. Technical assistance by Jens Bertelsen and Lene Korsholm Jørgensen is gratefully acknowledged. The authors declare that they have no conflict of interest. This article does not contain any studies with human participants or animals performed by any of the authors. Informed consent was obtained from all individual participants included in the study.
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Li, X., Topbjerg, H.B., Jiang, D. et al. Drought priming at vegetative stage improves the antioxidant capacity and photosynthesis performance of wheat exposed to a short-term low temperature stress at jointing stage. Plant Soil 393, 307–318 (2015). https://doi.org/10.1007/s11104-015-2499-0
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DOI: https://doi.org/10.1007/s11104-015-2499-0