Abstract: Effects of NaCl stress on the seed germination of 10 rapeseed lines were studied according to such salt tolerance indexes as seed germination index, the relative root length and seedling height. The results showed that when the NaCl concentration was 0.4%, the seedling growth was promoted and the seed germination index and the relative root length were not significantly inhibited for most lines. When the NaCl concentration was 0.6%, relative root length was significantly inhibited, but the other indexes were not significantly inhibited. When the NaCl concentration was 0.8%, relative root length and seedling height were significantly inhibited, but the germination index was not significantly inhibited. When the NaCl concentration was 1.0%, seeds of some lines could also germinate, but the germination index was significantly inhibited and the root and seedling could not grow. In conclusion, S82 and ZhiB14 showed the highest salt tolerance while the salt tolerance of Zm50×［9603×Zhe 758］ was the lowest according to the results of three salt tolerance indexes．

Key words: NaCl, seed germination, stress, Brassica napus