Interactive effects of gibberellic acid and salt stress on growth parameters and chlorophyll content in oat cultivars

Aim: The main objective of this studywas to evaluate the possible mode of interaction between salinity and application of gibberellic acid (GA3) and exploring how GA3 can mitigate the harmful effects of salinity. On the basis of reduction, growth parameter and chlorophyll contents, the cultivars were categorized as tolerant, moderate and sensitive. Methodology: To determine the effect of salinity on seed germination, seedling growth and chlorophyll contents pot experiment was carried out. Three different varieties (UPo-212, NDO-2 and UPO-94) were germinated under four different salinity levels (25,50,75 and 100mM). After 24 hrs., two sets of each were treated with100ppmof GA3 (reusedfor15 days). Results: The results revealed that when seedling were treated with GA3under different salinity conditions, cv. NDO-2 and UPO-212 showed better growth and high chlorophyll content than cv. UPO-94. This study conducts that 100 ppm concentrations of GA3will be able to overcome the toxic effects of salt stress in seed germination, seedling growth and chlorophyll contents. Interpretation: The study reveals that application of GA3 is useful to mitigate salinity stress and is more effective on salt tolerant cultivars.