以薄皮、厚皮及野生3种类型甜瓜种子为试材，研究了在不同质量浓度Cd胁迫下甜瓜种子的萌发差异。结果表明，Cd质量浓度≤ 50 mg/L时，对甜瓜种子的发芽率没有明显影响；野生甜瓜种子对Cd胁迫最敏感，在200 mg/L的Cd胁迫下发芽率仅为6.7%；高质量浓度Cd胁迫下甜瓜种子胚根不能正常伸长，易产生无根苗。所有参试品种初生根长度均随Cd质量浓度增加而下降，而芽长均随Cd质量浓度增加先升后降，Cd质量浓度 ≥50 mg/L时，初生根长和芽长的降幅较大。各类甜瓜种子萌发的鲜重对Cd胁迫相对比较稳定。总体而言，Cd质量浓度越大，对甜瓜种子萌发的抑制作用越强。Cd对甜瓜种子萌发抑制作用因品种而异，所测各项指标均呈厚皮甜瓜耐受性最高，野生甜瓜最低，薄皮甜瓜居中的趋势。

Three kinds of melon seeds as experimental materials， such as thin skin， thick skin and wild type， the germination difference of melon seeds under different Cd mass concentration was studied. The results show that when the concentration of Cd≤50 mg/L, it had no significant effect to melon seeds germination rate. The seeds of wild melon were most sensitive to Cd， the germination rate were 6.7% under Cd concentration of 200 mg/L. Under high concentration of Cd stress， the radicle growth were not normal， even the melon seeds were growing without roots. The root length of the melon seeds were dropped with increasing Cd concentration. But the hypocotyls length were increased at first and then dropped. The Cd had less effect to melon seeds fresh weight. In conclusion, the higher the Cd concentration， the greater the inhibition effects to the melon seeds germination. The inhibitory effect of Cd on melon seeds germination was different to different genotypes. All of the indicators of the musk melon were the highest， and the wild melon were the lowest.

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国家自然科学基金资助项目(31301795、 31360434、31471896)、农业部西北地区蔬菜科学观测实验站资助项目(2015-A2621-620321-G1203-066)部分内容。