Abstract
Drought stress is one of the most important agricultural problems limiting development and growth in plants. Therefore, mechanisms to alleviate drought stress have been one of the major limiting factors in production. H2O2 pretreatment has emerged as a method to induce stress acclimation in plants. In this study, the effects of H2O2 leaf pretreatment on plant growth, antioxidative enzymes, soluble protein, and organic solute content in maize plants under conditions of drought stress were analyzed. Results demonstrated that drought stress reduced shoot and root mass compared with the control, and H2O2 leaf spraying significantly improved the growth of drought-stressed plants. In general, in drought-stressed plants, CAT, APX, GPX, and SOD activities in roots and leaves were increased by H2O2 leaf spraying relative to water spraying. GPX was the main H2O2-scavenging enzyme in leaves and roots, and CAT activity was not detected in the leaves of maize plants. Increased organic solute contents (proteins, carbohydrates, soluble proline, and amino acids) were found in the leaves and mainly in the roots of H2O2-stressed plants relative to water-stressed plants. In conclusion, it was found that H2O2 leaf spraying pretreatment reduced the deleterious effects of drought stress on maize plant growth. This treatment proved to be a beneficial health strategy in plants. This effect could be attributed to the ability of H2O2 to induce antioxidant defense system activity, particularly GPX, and to increase organic solute (protein, carbohydrate, proline, and free amino acid) content in roots and leaves.
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Abbreviations
- ROS:
-
Reactive oxygen species
- SOD:
-
Superoxide dismutase
- CAT:
-
Catalase
- GPX:
-
Guaiacol peroxidase
- APX:
-
Ascorbate peroxidase
- H2O2 :
-
Hydrogen peroxide
- FM:
-
Fresh mass
- NBT:
-
Nitrobluetetrazolium
- SDM:
-
Shoot dry mass
- RDM:
-
Root dry mass
- TDM:
-
Total dry mass
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Acknowledgments
The authors are grateful to Fundação Cearense de Apoio ao Desenvolvimento Científico e Tecnológico (FUNCAP) for scholarship for Déborah Pâmela Freire de Sousa.
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de Sousa, D.P.F., Braga, B.B., Gondim, F.A. et al. Increased drought tolerance in maize plants induced by H2O2 is closely related to an enhanced enzymatic antioxidant system and higher soluble protein and organic solutes contents. Theor. Exp. Plant Physiol. 28, 297–306 (2016). https://doi.org/10.1007/s40626-016-0069-3
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DOI: https://doi.org/10.1007/s40626-016-0069-3