Shahed University

The effect of deficit irrigation and foliar application of polyamines on seed and oil yield, water use efficiency and fatty acids of spring safflower seed oil (Carthamus tinctorius L.)

Seyed Ali Mohamad Modares Sanavi | Alireza Rezazadeh | Majid Amini Dehaghi | Kayvan Fathi Amirkhiz

Date :  2021/12/01
Publish in :    علوم گياهان زراعي ايران - علوم کشاورزي ايران سابق

Keywords : Biological yield, harvest index, linoleic acid, oil percentage, water deficit stress

Abstract :
The aim of this study was to investigate the effect of foliar application of polyamine compounds on seed and oil yield and fatty acids profile in safflower under deficit stress irrigation. A split plot experiment based on randomized complete block design with four replications were conducted in the research farm of College of Agriculture, Shahed University in 2016-2017.The studied treatments were included irrigation as the main factor and foliar application of polyamine compounds as a secondary factor. Irrigation factor had two levels normal irrigation and deficit irrigation (irrigation after 50 and 75 depletion of field capacity, respectively). Foliar application of polyamine compounds had 10 levels including: foliar application with water (as control) and foliar application with putrescine, spermidin and spermin each of which in 0.05, 0.1 and 0.2 mM concentrations. At each of the irrigation levels, the Putrescine foliar application significantly increased seed and oil yield, harvest index, water use efficiency and oleic acid. Increased levels of putrescine and spermin foliar application ranged from 0.05 to 0.2 mM under conditions of deficit irrigation stress, increasing the biological yield by 40.4 and 38.3, respectively, compared to the control treatment. Also, foliar application of spermin with the highest concentration (i.e. 0.2 mM) under deficit water stress significantly increased the total amount of unsaturated fatty acids and reduced the percentage of palmitic acid. spermidine foliar application significantly increased the amount of linoleic acid in safflower oil under deficit irrigation conditions. It can be concluded that foliar application of polyamine compounds can increase seed and oil yields and water use efficiency and improve the quality of safflower oil in deficit irrigation conditions.