Iranian Journal of Horticultural Science

Iranian Journal of Horticultural Science

Effect of potassium silicate on growth, physiological and biochemical characteristics of Pelargonium graveolens under salinity stress

Document Type : Full Paper

Authors
Fatemeh Hassanvand 1
Abdolhossein Rezaei Nejad 2
1 Former M.Sc. Student, Faculty of Agriculture, Lorestan University, Khorramabad, Iran
2 Associate Professor, Faculty of Agriculture, Lorestan University, Khorramabad, Iran
10.22059/ijhs.2018.210950.1040
Abstract
This research was carried out to evaluate the effect of potassium silicate on geranium reaction to salinity stress in 2014. The experiment was done hydroponically in pots filled with sand. Experiment was laid out factorially based on a completely randomized design with four replications each replication included 9 treatment compositions with 36 pots. Factors consisted of daily application of 1.8, 4 and 6 ds/m NaCl and weekly application of 0, 0.5 and 1 mM potassium silicate through nutrient solution. Result showed that by increasing salinity, growth parameters, essential oil, relative water content and the activity of catalase and peroxidase decreased while Malondialdehyde, electrolyte Leakage and amount of proline increased. Application of potassium silicate improved growth and physiological and biochemical characteristics ofgeranium under salinity stress. Moreover, leaf Na increased while P content decreased, respectively, as salinity increased and application of potassium silicate increased P and decreased Na under salinity in canopy of plant. Many characters i.e. leaf area, shoot fresh and dry weights values returned to control as 1mM potassium silicate was applied. Overall, the results showed that increasing salinity pronounced stress symptoms and weekly application of potassium silicate especially at 1 mM, alleviated the stress effects.
Keywords
Catalase
Essential oil
potassium
proline
Peroxidase
Silicon
sodium
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Iranian Journal of Horticultural Science
Volume 48, Issue 4 - Serial Number 4
Winter 2018
Pages 743-752

  • Receive Date 10 July 2016
  • Revise Date 25 August 2016
  • Accept Date 03 September 2016