Abstract: In this paper , the effect of NaCl concentration ( 1× 104 - 6× 104 mg/L) on the seed germination of smooth cordgrass ( Spartina alterniflora) was investigated using 1/2 Hoagland as the basic culture solution. The results indicated that the coleoptile and embryonal axis grew before the radicle and plumule in the stage of germination . Salinity level had no influence on the seed germination percentage when the salt concentration didn′t exceed 3×104 mg/L. The optimal salinity level for seed germination and embryo growth was 1×104 mg/L . The inhibit effect of salt concentration on the growth of embryo′s different part was different, and the length of radicle and plumule decreased significantly with the increase of salt concentration. However , the lesser inhibition on the embryonal axis and coleoptile was observed under the higher salt concentration, and thus the seedlings out of soil were ensured and the species was quickly adapted to the environment of inter- tidal zone .

Key words: Smooth cordgrass ( Spartina alterniflora)