Abstract
The purpose of this study was to investigate the mechanisms underlying alleviation of salt stress by mycorrhization. Solanum lycopersicum L. cultivars Behta and Piazar with different salinity tolerance were cultivated in soil without salt (EC = 0.63 dSm−1), with low (EC = 5 dSm−1), or high (EC = 10 dSm−1) salinity. Plants inoculated with the arbuscular mycorrhizal fungi Glomus intraradices (+AMF) were compared to non-inoculated plants (−AMF). Under salinity, AMF-mediated growth stimulation was higher in more salt tolerant Piazar than in sensitive Behta. Mycorrhization alleviated salt-induced reduction of P, Ca, and K uptake. Ca/Na and K/Na ratios were also better in +AMF. However, growth improvement by AMF was independent from plant P nutrition under high salinity. Mycorrhization improved the net assimilation rates through both elevating stomatal conductance and protecting photochemical processes of PSII against salinity. Higher activity of ROS scavenging enzymes was concomitant with lowering of H2O2, less lipid peroxidation, and higher proline in +AMF. Cultivar differences in growth responses to salinity and mycorrhization could be well explained by differences in ion balance, photochemistry, and gas exchange of leaves. Function of antioxidant defenses seemed responsible for different AMF-responsiveness of cultivars under salinity. In conclusion, AMF may protect plants against salinity by alleviating the salt-induced oxidative stress.
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- ABA:
-
Abscisic acid
- AMF:
-
Arbuscular mycorrhizal fungi
- APX:
-
Ascorbate peroxidase
- CAT:
-
Catalase
- EC:
-
Electrical conductivity
- ETR:
-
Electron transport rate
- MDA:
-
Malonyldialdehyde
- POD:
-
Peroxidase
- ROS:
-
Reactive oxygen species
- SOD:
-
Superoxide dismutase
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Acknowledgements
This research was financially supported by Research Council, University of Tabriz, Iran and in part by the Spanish Ministry of Science and Innovation (DGCIYT project BFU2007-6032/BFI). The helpful comments of the editor and two anonymous reviewers a gratefully acknowledged.
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Hajiboland, R., Aliasgharzadeh, N., Laiegh, S.F. et al. Colonization with arbuscular mycorrhizal fungi improves salinity tolerance of tomato (Solanum lycopersicum L.) plants. Plant Soil 331, 313–327 (2010). https://doi.org/10.1007/s11104-009-0255-z
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DOI: https://doi.org/10.1007/s11104-009-0255-z