Abstract:

The aim was to study the effects of Salt stress on seed germination and young seedling growth of Vitex trifolia var. simplicifolia. Its’ seeds were treated with different concentrations of salt stress, and related indicators of seed germination and germination index, and determined the protective enzyme activity and other related physiological indexes of young seedlings under salt stress. The results showed that the optimal germination was obtained under control conditions. With the rising of the salt stress，the root activity first increased and then reduced, and they reached the maximum values when salt content was 30%, and the praline content of the seedlings increased. The activities of protective enzyme SOD, CAT and POD were all improved firstly then fell along with salt stress increased, and the activities of SOD and POD reached the maximum values when salt content was 20%, the activities of CAT reached the maximum values when salt content was 30%. The contents of MDA first were reduced and then increased as concentrations of the artificial seawater increased. These results suggested that the seedling growth of Vitex trifolia var. simplicifolia suitable for some concentrations of seawater, but its seed germination was suitable for saltless environment.