Physiological and Morphological Responses of Wheat (Triticum aestivum L.) andTomato (Solanum lycopersicum L.) to Seed Priming with Indole Acetic Acid as PlantGrowth Regulator

The use of plant growth hormones has become increasingly important in agriculture as they have the potential to improve plant growth, act as slow-release fertilizers, and facilitate targeted delivery of agrochemicals for sustainable crop production.In our study, we aimed to investigate the effects of different concentrations of Indole acetic acid (IAA) on the growth rate and antioxidant enzyme activities of wheat and tomato plants.Different concentrations of IAA (control, 0.1, 1, 2.5, 5, 10, and 20mmol.L -1 ) were applied for 24 hours using seed priming techniques for wheat and tomato seeds.Our results showed that the application of IAA resulted in enhanced plant height, shoot and root biomass, and leaf area.Chlorophyll (a, b) and total chlorophyll contents were also promoted in wheat and tomato with varying responses.The highest growth level in wheat was recorded at 2.5mmol.L -1 treatment, whereas in tomato, it was recorded at 5mmol.L -1 followed by 10mmol.L -1 treatment.Moreover, the application of IAA significantly increased antioxidant enzyme activities such as Glutathione, Nitric Oxide, and malondialdehyde.These results suggest that IAA has a different effect on wheat and tomato seed priming, indicating that it may increase plant growth and development in different responses.

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