不同扦插条件对奇岗芒插条生根的影响

Effects of different cutting conditions on rooting of Miscanthus×giganteus cutting

摘要:

以奇岗芒为材料,探究不同扦插部位、扦插时间、外源激素对奇岗芒茎段扦插的成活率及生根的影响。结果表明:下部茎段扦插的幼苗生根与成活状况优于中部茎段扦插的幼苗;不同扦插时间处理8月下旬至9月初扦插幼苗成活率为87.5%,株高为44.05 cm,生根数为7.05条/株,最长根长为26.03 cm,地上部鲜干重为1.673,0.561 g/株,地下部的鲜干重为0.372,0.135 g/株,均达到最大值,且扦插幼苗生长状况最佳。在0、25、50、75、100 mg/L 5个浓度GA₃处理下,随着浓度的增加,茎段扦插幼苗的株高、最长根长、生根数及地上下部鲜干重均呈现先降低后升高再降低的变化趋势,且均在75 mg/L GA₃处理时达到最大值;而IBA、NAA处理对茎段扦插的生根与成活有抑制作用,且NAA处理的抑制作用最强。

Abstract:

In this study,Miscanthus×giganteus was used as cutting material to explore the effects of different cutting position,cutting time and exogenous hormones on the survival rate and root growth of Miscanthus×giganteus stem cutting.The results showed that the rooting and survival status of seedling from lower stem position cutting is better than that from middle stem position cutting.From the end of August to the beginning of September,the survival rate,seedling height,rooting number,longest root length,and fresh and dry weight aboveground and underground of cutting seedlings reached the maximum value,which were 87.5%,44.05 cm,7.05,26.03 cm,1.673 g,0.561 g,0.372 g,and 0.135 g,respectively,and the growth condition was the best.Under the treatment with exogenous hormones at concentrations of 0,25,50,75 and 100 mg/L,with the increase of concentration,the survival rate,seedling height,longest root length,number of roots,and the fresh dry weight aboveground and underground of the stem cutting seedlings decreased first,then increased and decreased again,and reached the maximum at 75 mg/L GA3 treantment.In addition,the results showed that IBA and NAA treatment inhibited the rooting and survival of stem cutting seedlings,and NAA treatment had the strongest inhibiting effect.This study demonstrated the effects of cutting position,cutting time and exogenous hormones on the cutting efficiency of Miscanthus×giganteus,and provided a basis for the stem cutting propagation of Miscanthus×giganteus.