人工老化处理对垂穗披碱草种子活力指标的影响

Effects of artificial ageing treatment on vigor index of Elymus nutans seeds

以垂穗披碱草(Elymus nutans)种子为材料,从12到96h设8个人工老化处理时间,研究老化过程中种子的发芽率和活力的变化以及二者之间的关系。活力指标包括发芽势、活力指数、幼苗长度以及反映膜透性的电导率和可溶性糖含量等。结果表明,随老化时间的增长,种子的发芽率、发芽势以及活力指数先急剧下降(12h)而后缓慢下降,浸种液电导率变化不明显,而可溶性糖含量呈先急剧增加(12h)而后无明显变化。不同老化程度种子的发芽率与发芽势、活力指数相关性极显著(r分别为0.987和0.989,P<0.01);与浸种液电导率不显著相关,与可溶性糖含量呈极显著负相关(r=-0.808,P<0.01)。

An experiment was conducted to determine the relationship between seed germination percentage and the seed vigor in the process of artificial ageing Elymus nutans seed, and the artificial ageing time was set 8 grads from 12 h to 96 h. The vigor indicators included germination energy, vigor index, seedling length, conductivity and soluble sugar content. This study showed that seed germination percentage, ger- mination energy and vigor index sharply decreased and slowly decreased after 12 h as artificial ageing time increased. The conductivity in seed leachate did not significantly respond to the ageing time, while the sol- uble sugar content increased greatly before 12 h and then did not significantly changed when the ageing time continued. Germination percentage of E. nutans was significantly correlated with germination energy （r=0. 987） and vigor index （r=0. 989）, respectively, and was not significantly correlated with conductivity in seed leachate, and negatively and significantly correlated with the soluble sugar content in seed leachate （r=-0. 808）.