以8个白菜型冬油菜品种(系)为材料，研究NaCl胁迫对耐盐性不同白菜型冬油菜种子发芽势、发芽率、胚根、胚芽长度以及干鲜重的影响。结果表明，盐胁迫对白菜型冬油菜种子萌发具有显著的抑制作用，盐浓度越高，对种子萌发的抑制作用越大，种子的发芽指数、活力指数、胚根长和干鲜重等均呈不断下降的趋势，且处理盐浓度越高，下降的速率越快。胚根、胚芽长度对于不同盐浓度处理十分敏感，较低盐浓度处理时，胚根、胚芽长度显著低于空白对照组；盐浓度较高时，胚根、胚芽无法正常生长，种子萌发受到严重抑制。180、240 mmol/L NaCl处理对参试品种均有很强的抑制作用，相关指标下降幅度明显，各品种在相同盐浓度处理下的差异较大，表明各品种(系)的耐盐性存在差异。以耐盐半致死浓度作为评价指标，参试品种的耐盐性由强到弱依次为18R-X、MYW、BHH、DQW-1、GSY-1、WYW-1、TY7、JD8。

In this experiment， eight different winter rapeseeds(Brassica rapa L.) were used as materials to study the effects of NaCl stress on the germination potential， germination rate， radicle， length of germ and dry fresh weight of winter rapeseed seed with different salt tolerance. The results showed that salt stress had significant inhibitory effect on seed germination of winter rapeseed. The higher the salt concentration， the greater the inhibition of salt stress on seed， vigor index， vigor index， radicle length and dry fresh weight of winter rapeseed seed all showed a decreasing trend， the higher the salt concentration， the faster the rate of decrease. The radicle and germ lengths were very sensitive to different salt concentration， and the radicle and germ lengths were significantly lower than those of the blank control group；when the salt concentration was high， the radicle and germ could not grow normally， and the seed germination was seriously inhibited. The NaCl treatment of 180 mmol/L and 240 mmol/L had a strong inhibitory effect on the tested cultivars， and the decrease range of related indexes was obvious. The differences of various cultivars under the same salt concentration treatment were large， indicating that the salt tolerance of various cultivars (lines) was different. With the salt tolerance semi-lethal concentration as the evaluation index， the salt tolerance of the tested cultivars from strong to weak was 18R-X， MYW， BHH， DQW-1， GSY-1， WYW-1， TY7， JD8.

S565.4

甘肃农业大学SRTP项目(201901002)，国家现代农业产业技术体系(CARS-13)；甘肃省重大专项(17ZD2NA016-4) ；甘肃省农业产业技术体系(GARS-TSZ-1)。