硬尖神香草种子萌发特性及耐盐性研究OA

To explore the suitable germination conditions for Hyssopus cuspidatus Boriss.,seeds were used as materials to study their germination characteristics under different temperatures(15,20,25,30,35℃),hormone solutions(100 mmol/L IAA,6-BA,GA₃),and salt solutions(NaCl,Na₂CO₃)at various concentrations.Parameters including germination rate,germi-nation potential,seedling plumule length,radicle length,fresh weight,and dry weight were measured.Regression analysis was employed to determine the seed tolerance to salt stress.The results showed that the optimal temperature for seed germi-nation of H.cuspidatus was 20℃.Soaking seeds with exogenous hormones GA₃ and 6-BA improved the germination rate,germination index,and vigor index,exhibiting a positive promoting effect on seed germination.With increasing salt concen-tration,all germination indices of NaCl soaked seeds showed promotion at low concentrations but inhibition at high concentra-tions.For Na₂CO₃ soaked seeds,all indices showed a gradual decreasing trend.The seeds of H.cuspidatus exhibited higher tolerance to NaCl,with a lethal concentration of 212.48 mmol/L.These findings provided a reference for seedling propagation and selection of standardized planting bases for Hyssopus cuspidatus Boriss.