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population in June. The lowest phenolic content was observed in GF and SE populations, and drought stress applications did not increase their phenolic content overall. It was determined that the phenol levels of TH populations were different and the populations reacted differently with water deficiency concerning phenolic constituents and photosynthetic efficiency (Fv/Fm ratio). GF and SE populations may be more tolerant, and PL population may be more sensitive to drought stress when comparing Fv/Fm values among populations. Future studies should be focused on antioxidant enzyme activities like SOD, CAT and PAL to clarify the endurance of populations against abiotic stresses. It was observed that TH leaves, byproduct of hazelnut harvesting, have potential as a source of natural antioxidants in nutraceutical industry and can be improved with drought stress depending on genetic differences.
ACKNOWLEDGEMENTS
ZAHVALA
This study was carried out jointly with the Western Black Sea Forestry Research Institute and Bolu Abant Izzet Baysal University, Faculty of Arts and Sciences, Department of Biology. We thank the relevant institutions for their support.
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