Abstract
To analyse nodular expression of antioxidant enzymes depending on plant genotype and salinity, two Phaseolus vulgaris genotypes, tolerant BAT477 and sensitive COCOT, were inoculated with the reference strain Rhizobium tropici CIAT899 and grown under 25 and 50 mM NaCl. Plant growth, nodulation and nitrogen fixing activity measured by the acetylene reducing activity (ARA) as an indicator of nitrogenase (E.C. 1.7.9.92) activity were more affected by salt concentrations in COCOT than in BAT477, particularly with 50 mM NaCl. Electrophoresis analysis of antioxidant enzymes in nodules, roots and free-living rhizobia showed that only catalase (CAT E.C. 1.11.1.6) isoenzymes varied with genotype. The sensitive genotype showed lower antioxidant enzyme activities than tolerant genotype and it was more affected by salinity. In the tolerant genotype catalase and ascorbate peroxidase (APX, E.C. 1.11.1.11) were inhibited by salt stress, whereas superoxide dismutase (SOD, E.C. 1.15.1.1) and peroxidase (POX, E.C. 1.11.1.7) were activated by salinity. Statistical analysis allowed suggesting that tolerance to salinity is associated with a differential regulation of distinct superoxide dismutase and peroxidase activities.
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Abbreviations
- APX:
-
Ascorbate peroxidase
- ARA:
-
Acetylene reducing activity
- ASC-GSH cycle:
-
Ascorbate–glutathione cycle
- CAT:
-
Catalase
- EDTA:
-
Ethylenediaminetetraacetic acid
- MTT:
-
3-(4,5-Dimethlthiazol-2-4)-5-5diphenyl tetrazolium bromide
- NBT:
-
Nitroblue tetrazolium
- NDW:
-
Nodule dry weight
- PMSF:
-
Phenylmethylsulfonyl fluoride
- POX:
-
Guaiacol peroxidase
- PVP:
-
Polyvinyl-pyrrolidone
- ROS:
-
Reactive oxygen species
- RDW:
-
Root dry weight
- SDW:
-
Shoot dry weight
- SOD:
-
Superoxide dismutase
- TEMED:
-
N,N,N′,N′-tetramethyl ethylene diamine
- Tris:
-
Tris (hydroxymethyl) aminomethane
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Acknowledgments
This work was supported by grants from the Tunisian Ministry of Scientific Research, Technology and Competency Development. We are most grateful to Dr. Inoubli T for English revision. We thank Zitoun A, for excellent technical support.
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Communicated by G. Klobus.
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Jebara, S., Drevon, J.J. & Jebara, M. Modulation of symbiotic efficiency and nodular antioxidant enzyme activities in two Phaseolus vulgaris genotypes under salinity. Acta Physiol Plant 32, 925–932 (2010). https://doi.org/10.1007/s11738-010-0480-3
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DOI: https://doi.org/10.1007/s11738-010-0480-3