Iranian Journal of Horticultural Science

Iranian Journal of Horticultural Science

The effect of Paclobutrazol and Trinexapac-ethyl on morphological and physiological characteristics of Rosmari (Rosmarinus officinalis) and Thuja (Thuja orientalis “Morgan”) as two hedging plants

Document Type : Full Paper

Authors
Najmeh Zamani 1
Nematollah Etemadi 2
Abdolrahman Mohammadkhani 3
1 Former M.Sc. Student, Faculty of Agriculture-Islamic Azad University Isfahan (Khorasgan Branch), Iran
2 Associate Professor, Department of Horticultural Science, Faculty of Agriculture, Isfahan University of Technology, Iran
3 Associate Professor, Department of Horticultural Science, Faculty of Agriculture, Shahrekord University, Iran
10.22059/ijhs.2016.59813
Abstract
In recent years application of plant growth regulators especially growth retardants, has been significantly increased. Trizols (paclobutrzol and trinexapac-ethyl) as the most effective and least harmful growth retardants, induce more dwarf and denser cover plants with both darker and thicker leaves.  Therefore, an experiment based on completely randomized block design with 16 treatments and 3 replicates, was conducted to investigate the effect of paclobutrzol and trinexapac-ethyl application on morphological and physiological characteristics of rosemari and thuja “Morgan” as two hedge plants. Immediately after pruning, foliar spray was applied on each plant with 1000 and 4000 mg/l of paclobutrzol or 1000 mg/l of trinexapac-ethyl. Distilled water was used as control. Measured traits were included plant height and width, wet and dry weight of pruned parts, internode elongation, proline content, chlorophyll a, chlorophyll b and total chlorophyll content. Results indicated that growth retardants decreased plant height and width, wet and dry weight of pruned parts and internode elongation, while they increased proline content, chlorophyll a, chlorophyll b and total chlorophyll content as compared to the control plants.
Keywords
hedgeing plant
Paclobutrazol
trinexapac-ethyl
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Iranian Journal of Horticultural Science
Volume 47, Issue 3 - Serial Number 3
Autumn 2016
Pages 511-519

  • Receive Date 30 May 2014
  • Revise Date 18 March 2015
  • Accept Date 26 April 2015