Melatonin application enhances salt stress-induced decreases in minerals, betalains, and phenolic acids in beet (Beta vulgaris L.) cultivars.

Autor: Colak N; Department of Biology, Faculty of Science, Karadeniz Technical University, Trabzon, Turkey., Slatnar A; Department of Agronomy, Biotechnical Faculty, University of Ljubljana, Ljubljana, Slovenia., Medic A; Department of Agronomy, Biotechnical Faculty, University of Ljubljana, Ljubljana, Slovenia., Torun H; Biosystem Engineering, Faculty of Agriculture, Düzce University, Düzce, Turkey., Kurt-Celebi A; Department of Biology, Faculty of Science, Karadeniz Technical University, Trabzon, Turkey., Dräger G; Institute of Organic Chemistry, Gottfried Wilhelm Leibniz University Hannover, Hannover, Germany., Djahandideh J; Department of Molecular Food Chemsitry and Food Development, Institute of Food and One Health, Gottfried Wilhelm Leibniz University Hannover, Hannover, Germany., Esatbeyoglu T; Department of Molecular Food Chemsitry and Food Development, Institute of Food and One Health, Gottfried Wilhelm Leibniz University Hannover, Hannover, Germany., Ayaz FA; Department of Biology, Faculty of Science, Karadeniz Technical University, Trabzon, Turkey.
Jazyk: angličtina
Zdroj: Physiologia plantarum [Physiol Plant] 2024 Nov-Dec; Vol. 176 (6), pp. e14611.
DOI: 10.1111/ppl.14611
Abstrakt: Melatonin is a potentially active signaling molecule and plays a crucial role in regulating the growth and development of plants under stress conditions, alleviating oxidative damage, enhancing antioxidant defence mechanisms and regulating ion homeostasis. This study examined the effects of exogenous melatonin application on leaf biomass, ion concentrations, betalains, phenolic acid and endogenous melatonin contents comparing red beet (Beta vulgaris L. 'Ruby Queen' and 'Scarlet Supreme') and white beet ('Rodeo' and 'Ansa') cultivars under increasing salinity levels of 50, 150, and 250 mM NaCl. Exogenous melatonin increased salinity-induced reductions in fresh and dry weights and osmotic potential in leaves. Na + concentrations rose significantly with increasing salinity, but cultivar-specific decreases were observed in K + and Ca 2+ concentrations. Additionally, melatonin application improved betalain, betanin and neobetanin contents induced by salt stress. Furthermore, melatonin application caused salt stress and cultivar-specific changes in phenolic acid contents e.g., ferulic acid, sinapic acid, or m-coumaric acid, in soluble free, ester- and glycoside-conjugated and cell wall-bound forms. In addition, antioxidant enzyme activities and compound contents increased significantly in the beets and were subsequently lowered in a cultivar-specific manner by salt stress + melatonin treatment. The current findings indicate that exogenous melatonin improved plant stress tolerance suppressing reactive oxygen species levels, increasing the antioxidant enzyme activities and compound contents and reducing the levels of Na + , maintaining an ionic homeostasis in the selected red and white sugar beet cultivars. It appears that melatonin application may help improve cultivar-specific salt tolerance by enhancing ion homeostasis and betalain and phenolic acid production levels in beets.
(© 2024 Scandinavian Plant Physiology Society.)
Databáze: MEDLINE
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