مشخصات پژوهش

Salinity is one of the predominant abiotic stress factors that infuence the growth and productivity of plants. Salinity adversely impacts the growth responses via ionic toxicity, osmotic stress, impaired nutrients uptake, hormonal disparity, and the over-production of reactive oxygen species. To study the efects of salinity stress (0, 50, 100, and 150 mM) and foliar treatments (dH2O, 2 g L−1 Dobogen biostimulant, 2 g L−1 KNO3, and 2 g L−1 d-glucose) on the growth and physiological responses of Tanacetum balsamita, a factorial experiment was conducted based on the completely randomized design at the research greenhouse of Azarbaijan Shahid Madani University, Iran. The results showed the signifcant interaction efects of salinity and foliar sprays on chlorophyll a, K+ , Na+ , Mg2+, Fe2+, Zn2+, Mn2+, and Si content, K/Na ratio, and total phenolics and favonoids content. The highest phenolic content was acquired with 100 mM salinity and foliar spray of Dobogen and glucose, 50 mM NaCl × ­KNO3 application, and 50 mM salinity ×no-foliar application. The highest K/Na ratio was observed in control plants and controls × ­KNO3 and/or Dobogen application. The greatest Si content was recorded with no-salinity×Dobogen and KNO3 applications and no-saline×no-foliar (control) plants. The independent efects of treatments infuenced malondialdehyde, favonoids, proline contents, and catalase activity. Chlorophyll b and superoxide dismutase were afected by the salinity. Total soluble solids and Ca2+ content were responsive to the foliar applications. Malondialdehyde and proline content was the highest at 150 mM salinity. Salinity adversely afected the physiological responses of costmary. However, foliar treatments partially ameliorated the salinity efect, and the results with more detailed studies would be advisable to the extension section and pioneer farmers.