ISEEP-2017 VIII. Internatıonal Symposium on Ecology and Environmental Problems, Çanakkale, Turkey, 4 - 07 October 2017, pp.210
Environmental stresses can cause changes in physiological and biochemical responses in plants. Oxidative stress is produced in all living cells by excessive accumulation of non-radical molecules such as H2O2 as well as oxy-radicals such as O2●¯ and OH● produced in the biochemical pathways. Some varieties of important agricultural plants such as wheat are resistant to oxidative stress than the others. This study was aimed to investigate the roles of peroxidase (POX) and catalase (CAT) activities after strigolactone (SL) pretreatment (20 μM GR24) of seeds, under salt stress (0, 100, 200 mM NaCl) in drought-resistant (Tosunbey) and -sensitive (Sultan-95) wheat varieties.
Our results showed that POX activities were increased in the control group and decreased by 50% with GR24 pre-treatment with increased salt concentrations at the end of the experiment in Tosunbey. 100 mM and 200 mM NaCl treatments were reduced CAT activities by 37% and 75%, whereas those with GR24 addition were determined to be 9% and 19%, respectively. Conversely, GR-24 pre-treatment reduced the POX activity with 100 mM NaCl 39% and 200 mM NaCl by 35% in Sultan 95, while maintaining the POX activity in control plants at the end of the experiment. While CAT activities did not change this variety during salt stress compared to control plants, the pre-treatment of GR24 increased these activities by 58% and 74%, respectively, at the end of the experiment depending on the increased salt concentration. In conclusion, the addition of strigolactone against oxidative stress helps to reduce the negative effect of salt stress in sensitive wheat variety with increasing POX and CAT activities.