اثر كلريد كلسيم بر محتواي گاما آمينوبوتريك اسيد و كاهش آسيب تنش دمايي در گياه توت فرنگي

Heat stress induces many negative effects on plant growth and development and this damage may be highlighted along
with the prediction of global warming in the future. The purpose of this research was to investigate the metabolism
and the role of application of gamma-aminobutyric acid (GABA) in strawberry 􅅟 Camarosa􅅟 . For this purpose,
strawberries the stage of 4 to 5 fully expanded leaves were treated with GABA at 0.5, 1 and 5 mM and started heat
stress was applied 24 hours after the last foliar application. After applying the treatments, the plants were transferred
to the growth chamber with temperature of 25 and 40 °C, relative humidity of 70% and 1200 lux of light. After 10
hours of applying the temperature stress, the plants were taken out of the growth chamber and some physiological
traits were measured. The results showed that the external application of 5 mM GABA significantly increased the
content of soluble carbohydrates, internal GABA and the activity of catalase, ascorbate peroxidase and peroxidase
enzymes, and reduced hydrogen peroxide and the percentage of ion leakage, compared to the control treatment at 40
°C.
Keywords: Enzymatic antioxidants, 􅅟-Aminobutyric acid (GABA), Heat stress, Strawberry