Published in Scientific Papers. Series A. Agronomy, Vol. LXIV, Issue 2
Written by Abbas BIABANI, Azam ROUMANI, Ali RAHEMI KARIZAKI, Ebrahim GHOLAMALIPOUR ALAMDARI
In order to investigate the effect of drought stress on some physiological and biochemical characteristics of isabgol, a study was carried out as a split-plot factorial experiment based on a randomized complete block design with 18 treatments and three replications, at Iran, during growing seasons of 2016 and 2017. Irrigation treatment included; normal irrigation, cutoff irrigation at the flowering stage and cutoff irrigation at seed filling stage which considered as main-plots. Salicylic acid with three levels (0, 0.4 and 0.8 mM) and Spermine with two levels (0 and 0.02 mM) was assigned in sub-plots. The results of experiment showed that the highest grain yield under irrigation conditions was obtained by foliar spraying of 0.8 mM Salicylic acid and 0.02 mM Spermine at seed filling stage. Application of Salicylic acid at concentration of 0.8 mM along with or without Spermine improved the amount of the cell membrane stability index under different irrigation levels. The highest catalase activity in both years of the study was attributed to normal irrigation treatment with the foliar application of Salicylic acid at 0.4 mM concentration and with or without Spermine. Application of SA0.8 mM and Spm0.02 mM under cutoff irrigation condition increased the most of the measured features compared to control, which indicates the positive effect of these compounds.
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