“…Jamshidi Goharrizi et al (2020f) reported that the activity of antioxidants such as ascorbate peroxidase, catalase, and guaiacol peroxidase (GP) were enhanced in pistachio rootstocks under drought or salinity stress or a combination of the two stresses. Numerous studies have shown that the increased activity of enzymatic and non-enzymatic antioxidant systems are associated with tolerance to drought and salinity in a variety of plants including, wheat (Ahanger and Agarwal, 2017;Ahmadi et al, 2018;Dugasa et al, 2019), maize (AbdElgawad et al, 2016), rice (Islam et al, 2016;Basu et al, 2017;Vighi et al, 2017), Amaranthus tricolor (Sarker et al, 2018), soybeans (Liu et al, 2017b), Chenopodium quinoa (Fischer et al, 2017), Thymus vulgaris & T. daenensis (Bistgani et al, 2019), citrus (Hussain et al, 2018), cotton (Ibrahim et al, 2019a), Nicotiana tabacum (Da Silva et al, 2017), Fargesia rufa (Liu et al, 2017a), cabbage (Sahin et al, 2018), Anacardium occidentale (Lima et al, 2018), Cucumis sativus (Ouzounidou et al, 2016), sweet basil (Jakovljević et al, 2017), Carthamus tinctorius (Golkar and Taghizadeh, 2018), and Tagetes minuta (Moghaddam et al, 2019). The results of a study by Sheikh-Mohamadi et al (2017) showed that high levels of diamine oxidase (histaminase: DAO) and polyamine oxidase were associated with increased tolerance to drought and salinity.…”