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Additional information is available at the end of the chapter

http://dx.doi.org/10.5772/64201

### **Abstract**

To delineate the major processes associated with short water scarcity in four tall fescue species, we examined their enzymatic and nonenzymatic antioxidant activity and *FaSGR* expression levels. Moreover, we examined the possibility of *Agrobacterium*-mediated transformation of *Arabidopsis P5CS1* gene in tall fescue. According to the results, proline has been introduced as an important compatible osmolyte, so as to protect enzymes and cellular structures under water scarcity. In addition to that, superoxide dismutase (SOD) along with proline can be used as a core physiological indicator for the assessment of adaptability to environmental conditions. Results indicated that most of the superoxide that was produced as a result of drought stress was converted to H2O2 by SOD and subsequently detoxified by ascorbate peroxidase (APX) into H2O. Notably, the *FaSGR* transcript increased drastically over the course of the drought stress in Pixie and Minimustang, in contrast to jaguar and h–d, supporting the notion of Stay GReen (*SGR*) mediated chlorophyll degradation in the less drought-tolerant cultivars. Different modulations of ROSs quenching system in tall fescue genotypes suggest that even one stress signal causes different signaling responses in different cultivars. The heterolo‐ gous transformation of *P5CS1* in *Festuca arundinacea* background, confirmed by PCR and transient *GUS* assay, most probably can improve tall fescue tolerance to drought stress.

**Keywords:** drought stress, enzymes, proline, *SGR*, tall fescue
