Effect of salicylic acid and progesterone on physiological characteristics of Kentucky bluegrass under salinity stress

Salinity is one of the most important limiting factors in plant growth. It also a predominant constraint that impairs grass growth and quality. Plant hormones play roles capability plants to adapt environmental stresses. Hence, impact two regulators (PGRs) i.e. salicylic acid (SA) progesterone (P4) was studied on biological characteristics Poa pratensis saline conditions greenhouse experimnt. The experimental treatments were composed salinity at four levels (0, 2, 4, 6 dS m-1) six PGRs (control, 1 mg L-1 P4,10 P4, mM SA, 3 P4 + SA). results showed leaf firing percentage increased with excess salinity, but use SA eased effects stress reduced under salinity. m-1 caused maximum electrolyte leakage. highest relative water content observed 4 treatment. glycine betaine related NaCl no hormone application. total protein catalase, simultaneous exhibited catalase content, whilst control lowest ones. application chlorophyll it. improved carotenoid stress. Overall, tolerance pigments antioxidant enzyme activities.