The degreeoflignification varies from slight in protoxylem to heavy in sclerenchyma and some xylem vessels, but values of 25-30% lignin and 50% cellulose are average.
And the activity of PAL coincided with the increasing tendency of the Numbers of vessel element in the plumular axis or juvenile stem of robinia and its degreeoflignification as well.
PAL活力与刺槐胚轴或幼茎的维管系统即导管分子的数量和木质化程度增长趋势相一致。
3
The experiments, proved that developmental quality of root system of cutting seedling and lignificationdegreeof root system during seedling-laying are key factors to influence survival rate.