Physiological, oxidative, and antioxidative responses of Quercus vulcanica Boiss. and Quercus aucheri Jaub. & Spach. under drought stress conditions

Year 2024, Volume: 54 Issue: 1, 69 - 79, 30.04.2024

Hakan Özden , Gulriz Baycu

https://doi.org/10.26650/IstanbulJPharm.2024.1404110

Abstract

Background and Aims: Drought stress is one of the most common global factors of abiotic stress affecting plant growth and productivity world-wide. The present study aims to assess the effects of 1, 2, and 4 weeks of drought stress on the two endemic tree species, Quercus vulcanica and Q. aucheri

Methods: After applying drought stress conditions, the study determines the physiological parameters, markers of oxidative damage, and levels of antioxidant enzymes in the leaves and stems of 6-month-old oak seedlings.

Results: The dry and fresh weights were observed to decrease by at least 11.44%, as well as the chlorophyll levels by at least 14%, in both the Q. vulcanica and Q. aucheri that were subjected to 1, 2, and 4 weeks of drought stress. The carotenoid, proline, and anthocyanin levels also increased in the leaves of both Quercus species; however, the amount of ascorbic acid, reduced glutathione (GSH), and total soluble protein decreased in the leaves and stems of both Quercus species. As oxidative stress markers, the levels of hydrogen peroxide (H2O2) and lipid peroxidation were seen to elevate by at least 1.21 fold under drought stress conditions. This revealed some of the alterations in the activities of antioxidant enzymes in the leaves and stems of both Q. aucheri and Q. vulcanica.

Conclusion: In conclusion, this study revealed increasing drought stress to have a substantial impact on the physiological parameters and oxidative and antioxidant responses in Q. vulcanica and Q. aucheri. This will contribute to understanding how oak species respond to drought stress and their adaptation strategies.

Keywords

Q. vulcanica, Q. aucheri, drought stress, oxidative stress, antioxidant enzyme system

Supporting Institution

Scientific Research Projects Coordination Unit of Istanbul University

Project Number

T-756/13092005

Thanks

The authors would like thank to Prof. Mesut Kirmaci for the helping to collect the Quercus seeds and Prof. Osman Erol and Assist. Prof. Erdal Uzen for helping to transfer the seeds

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