Abstract
The effects of exogenous salicylic acid (SA), sodium nitropusside (SNP, a nitric oxide donor), or their combination on dwarf polish wheat (Triticum polonicum L.) seedlings under UV-B stress were studied. The UV-B stress significantly decreased plant height, shoot dry mass, pigment content, net photosynthetic rate, intercellular CO2 concentration, stomatal conductance, transpiration rate, and variable to maximum chlorophyll fluorescence ratio (Fv/Fm) in all plants, but less in the presence of SA, SNP, and their combination. On the other hand, there were considerable increases in malondialdehyde (MDA), proline, O2 •-, and H2O2 content under the UV-B stress. When SA, SNP, and their combination were applied, content of MDA, proline, H2O2, and O2 •- were less increased. Moreover, there were considerable increases in activities of superoxide dismutase, peroxidase, ascorbate peroxidase, and glutathione reductase under the UV-B stress and more in the presence of SA, SNP, and their combination. Therefore, it is considered that SA, SNP, and especially their combination could alleviate UV-B stress in dwarf polish wheat.
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Abbreviations
- APX:
-
ascorbate peroxidase
- Car:
-
carotenoids
- Chl:
-
chlorophyll
- ci :
-
intercellular CO2 concentration
- E:
-
transpiration rate
- GR:
-
glutathione reductase
- gs :
-
stomatal conductance
- MDA:
-
malondialdehyde
- NBT:
-
nitroblue tetrazolium chloride
- PFD:
-
photon flux density
- PN :
-
net photosynthetic rate
- POD:
-
peroxidase
- ROS:
-
reactive oxygen species
- SA:
-
salicylic acid
- SNP:
-
sodium nitroprusside
- SOD:
-
superoxide dismutase
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Acknowledgement: The authors appreciate the support from the Natural Science Foundation of the Sichuan Agricultural University and the Bureau of Education of Sichuan Province, China.
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Yan, F., Liu, Y., Sheng, H. et al. Salicylic acid and nitric oxide increase photosynthesis and antioxidant defense in wheat under UV-B stress. Biol Plant 60, 686–694 (2016). https://doi.org/10.1007/s10535-016-0622-6
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DOI: https://doi.org/10.1007/s10535-016-0622-6