盐度对拉贡木种子发芽的影响

Effect of Salinity on Seed Germination of Laguncularia racemosa(L.) Gaertn.F.

在盐度梯度为0、5、10、15、20、25、30、35、40、45条件下对拉贡木(Laguncularia racemosa(L.)Gaertn.F.)种子进行萌发实验,选取发芽率、发芽势、发芽指数、活力指数、平均发芽日数作为萌发指标.结果表明:拉贡木种子的最适萌发盐度为0～25,在盐度为30时,发芽受到一定抑制,但仍有较高的发芽率(73±9)%,当盐度达到40时,种子的萌发受到明显的抑制,无论是发芽速度还是发芽质量与低盐度相比都呈现明显的抑制现象.

In order to explore the effect of salinity on seed germination of Laguncularia racemosa （L.） Gaertn F, the seeds were set under 10 salinity gradients, 0,5,10,15,20,25,30,35,40,45, to investigate the seed germination. Germination percentage, germinating viability, germination index, average germinating time and vigor index have been choused as germination indices. The results indicated that the most optimal salinity for the seed germination was 0-25 ,the germination percentage was not different from salinity gradients：nearly 100%. In 10 salinity, the germination viability and germination index were highest. When the salinity was above 30, the germination was slightly inhibited, but the germination percentage was still high （73 ± 9）%. When the salinity above 40, the germination was significantly inhibited, either germination rate or germination quality： the germination percentage was below 4%, and germination viability and germination index were significantly lower than other salinities.