Abstract
In our study, one-month-old Melissa officinalis plants were subjected to Fe-deficiency treatments, such as 10 µM Fe (as direct iron deficiency, DD), and 30 µM Fe + 10 mM NaHCO3 + 0.5 g l−1 CaCO3 (as indirect iron deficiency, ID), and 30 µM Fe (as control) for 14 d. Both Fe-deficiency types reduced plant growth, photosynthetic pigment contents, an active Fe content in roots and leaves, root Fe(III)-reducing capacity, Fe-use efficiency, maximal quantum yield of PSII photochemistry, a ratio of variable to basic fluorescence, and activities of antioxidant enzymes, while they increased lipid peroxidation and a H2O2 content in leaves. These effects were more pronounced in plants exposed to ID with bicarbonate than those of DD plants. We showed that sodium nitroprusside (SNP), as NO donor, could ameliorate the adverse effects of bicarbonate on above traits. The methylene blue, as NO blocker, reversed the protective effects conferred by SNP in the ID-treated plants as well as DD plants. These findings suggests that NO protects photosynthesis and growth of IDtreated plants as well as DD plants by contribution in availability and/or delivery of metabolically active iron or by changing activities of reactive oxygen species-scavenging enzymes.
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Abbreviations
- APX:
-
ascorbate peroxidase
- C:
-
control
- CAT:
-
catalase
- Car:
-
carotenoids
- Chl:
-
chlorophyll
- DD:
-
direct Fe deficiency
- DHAR:
-
dehydroascorbate reductase
- DM:
-
dry mass
- F0 :
-
minimal fluorescence yield of the dark-adapted state
- Fv/Fm :
-
maximal quantum yield of PSII photochemistry
- FM:
-
fresh mass
- ID:
-
indirect Fe deficiency
- MDA:
-
malondialdehyde
- MB:
-
methylene blue
- NO:
-
nitric oxide
- POX:
-
peroxidase
- ROS:
-
reactive oxygen species
- SNAP:
-
S-nitroso-N-acetylpenicillamine
- SNP:
-
sodium nitroprusside
- SOD:
-
superoxide dismutase
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This study was supported by a financial grant of Shahrekord University, Iran. The authors are grateful to Dr. Akbar Mostajeran for his kind cooperation and help in providing laboratory facilities for this research, and for his guidance.
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Amooaghaie, R., Roohollahi, S. Effect of sodium nitroprusside on responses of Melissa officinalis to bicarbonate exposure and direct Fe deficiency stress. Photosynthetica 55, 153–163 (2017). https://doi.org/10.1007/s11099-016-0240-8
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DOI: https://doi.org/10.1007/s11099-016-0240-8