KNO3和抗坏血酸对老化草地早熟禾种子活力的影响

试验以贮藏5年自然老化的草地早熟禾(Poa p ratensis)'午夜'种子为材料,采用不同浓度的KNO3(0％,1.0％,2.0％ 和4.0％)和抗坏血酸(0,0.5,1.0和1.5mmol·L-1)引发0,1和2d后,回干进行发芽试验,测定发芽率、活力指数、平均发芽天数、芽长、芽鲜重、根长和根鲜重等指标,探究其对...

Effects of KNO3 and Ascorbic Acid Priming on the Vigor of Aged Poa pratensis Seeds

In this experiment,the seeds of Kentucky bluegrass‘Midnight’which had been stored for 5 years were used as materials.The seeds were primed by KNO₃ or ascorbic acid at different concentrations for 0,1 or 2 d,respectively,then dehydrated for 8 h.The germination percentage,vigor index,mean germination time,shoot length,shoot fresh weight,root length and root fresh weight were determined to explore the effects of KNO₃ and ascorbic acid priming on the vigor of aged Poa pratensis seeds.The results were as follows.The germination percentage,vigor index,root length,shoot length and root fresh weight of aged seeds under KNO₃ or ascorbic acid treatment were significantly higher than those of the control,and the mean germination time was significantly shortened,but the effect on shoot fresh weight was not significant.With the membership function analysis,0.5 mmol·L^-1ascorbic acid priming for 2 d was considered as the best treatment,resulting in that the germination percentage and vigor index were elevated by 25.24%and 41.54%,respectively,and the mean germination time was shortened by 1.76 d,compared with the control.