Zahra Mahdavi, Behrooz Esmailpoor, Rasoul Azarmi,
Volume 12, Issue 3 (9-2025)
Abstract
The different treatments in this experiment were foliar spraying of salinity reducer at five levels (control, 15 and 30 mgL-1 glycine betaine without liquid fish waste fertilizer, 15 and 30 mgL-1 glycine betaine with 15% (v/v) liquid fish waste fertilizer) on stevia plants grown under salt stress conditions (0, 30, 60, 90 mM of NaCl). results showed that salinity negatively affected growth parameters, relative water content, a* and b* color and increased the activity of total phenol, hydrogen peroxide (H2O2), malondialdehyde (MDA), proline, and total carbohydrates compared with control samples. Salinity at 90 mM decreased the relative water content by 44.7% compared to the not stress. Salinity 90 mM salinity stress increased 70.46% total carbohydrates, 66.66% in H2O2 , MDA by 66.66% , Electrolyte leakage (EL) by 67.04 and 47.21% proline content by compared to the control. On the other hand, simultaneous application of glycine betaine and fish waste bio-fertilizer mitigated the effects of salinity stress by enhancing growth parameters especially at the highest salinity level (90 mM).
