In　this study， the effects of saline-alkali stress on seed germination characteristics of two common Artemisia species from the Songnen grassland-Artemisia sieversiana Ehrhart ex Willd. and A. lavandulifolia DC. were investigated under three groups of different day/night temperature conditions （5/15℃， 15/25℃， and 25/35℃）. Four concentrations （0， 12.5， 25， and 50 mmol·L^-1） of neutral salt （NaCl）， alkaline salt （Na₂CO₃）， and composite saline-alkali solutions （NaCl+Na₂CO₃） were simulated to assess germination percentage， germination rate， and germination potential. The results indicated that seed germination in both A. sieversiana and A. lavandulaefolia was significantly influenced by temperature， saline-alkali stress， species， and the most interactive effects （P<0.05）. The germination percentage rate， and potential of A. sieversiana seeds first decreased and then declined with the increase of temperature， and the optimal germination temperature condition was 15/25℃. A. lavandulifolia exhibited declining germination indicators with the increase of temperature， showing optimal performance at 5/15℃. The germination capacity of A. sieversiana seeds decreased with increase of the concentration of the three saline-alkali solutions under all the tested temperature treatments， and was significantly lower than CK at medium-high concentrations （P<0.05）. The germination characteristics of A. lavandulifolia seeds increased first and then decreased with the increase of the concentration of three saline alkali solutions at low temperature. Treatment with 25.0 mmol·L^-1 single salt solution （NaCl）， 12.5 mmol·L^-1 single alkali solution （Na₂CO₃）， and mixed saline-alkali solutions （NaCl + Na₂CO₃） significantly promoted seed germination compared to the control （P<0.05）. At low concentrations across the three solution types， both species showed no significant differences in germination performance. However， under stress with high-concentration of mixed saline-alkali solutions resulted in markedly lower germination rates compared to individual salt or alkali treatments. Additionally， the interactive effects of saline-alkali stress and temperature exerted dual inhibitory impacts on seed germination.

Salt tolerant plants  /  Seed germination  /  Salinization and alkalization  /  Temperature