Iranian Journal of Horticultural Science

Iranian Journal of Horticultural Science

Effect of ϒ-aminobutyric acid (GABA), humic acid and salicylic acid on some ‎morphophysiological responses and antioxidant characters of Catharanthusroseus L‏.‏‎ (G.Don)‎

Document Type : Full Paper

Authors
Elahe Bayanloo 1
Mitra Aelaei 2
Mohsen Sanikhani 2
1 Former M. Sc. Student, Faculty of Agriculture, Department of Horticultural Science, University of Zanjan, Zanjan, Iran
2 Assistant Professor, Department of Horticultural Science, Faculty of Agriculture, University of Zanjan, Zanjan, Iran
10.22059/ijhs.2018.251946.1397
Abstract
Periwinkle plant Chatarantus roseus L. from Apocynaceae family is one of the valuable ornamental-medicinal plants. In order to evaluate the effects of ϒ-aminobutyric acid, humic acid and salicylic acid on some characteristics of periwinkle an experiment was conducted based on complete randomized design (CRD) with three replications at Agriculture Faculty university of Zanjan. Treatments included ϒ-aminobutyric acid (0.5, 0.75 and 1 mM), humic acid (50, 100 and 150 mg.L-1) and salicylic acid (0.5, 1 and 2 mM). The results showed that highest plant height, stem diameter and leaf number was achieved 0.5mM concentration of ϒ-aminobutyric acid which had a significant difference whit the control treatment. The lowest days to flowering were 0.5 mM salicylic acid. Foliar application of 2 mM salicylic acid was significant (p<0.01) on plant height, stem diameter, phenol, peroxidase and catalase activities in compared to the control treatment. Between the different treatments, the concentration of 50 mg.L-1humic acid had the highest effect on flavonoids content. Also, plant height, stem diameter, day to flowering, peroxidase and catalase activity significantly increased in the concentration of 150 mg.L-1 humic acid compared to control treatment. Between all treatments, the highest catalase activity was observed in 2 mM salicylic acid and the highest peroxidase activity was observed in 1 ϒ-aminobutyric acid and 2 mM salicylic acid treatments. Therefore, the yield, physiological and phytochemical indices of the periwinkle improved by using of ϒ-aminobutyric acid, humic acid and salicylic acid.
Keywords
Antioxidant activity
flavonoids
growth indices
phenol
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Iranian Journal of Horticultural Science
Volume 50, Issue 4
Winter 2020
Pages 993-1008

  • Receive Date 06 February 2018
  • Revise Date 23 September 2018
  • Accept Date 12 October 2018