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枝条扦插,在近代国内外一些著作中论述:同一枝条的上下端具有形态上和生理上的不同特征,即所谓极性现象。还以杨柳为例作了实验,认为无论将枝条顺着正的或倒转方向悬着,根只能从形态下端生出,它们的一端总是形成根,另一端形成带叶的新枝。并认为极性的发生可能与生长素在茎内向一定方向流动和累积有关,即从器官先端向其基部进行的运输,在生长素累积的部分刺激了愈合组织,促进了根的形成和生长。
Branch cutting, in a number of modern writings at home and abroad to discuss: the same branches above and below the morphological and physiological characteristics of different, the so-called polar phenomenon. Will also be an example of willow as an experiment, that regardless of the branches along the direction of positive or inverted dangling, the root can only be born from the bottom of the form, they always form a root at one end and the other end of the formation of new branches with leaves. And it is considered that the polarity may be related to the flow and accumulation of auxin in the stem in a certain direction, that is, the transport from the organ front to the base, and the accumulation in the auxin stimulates the healing tissue and promotes the formation and growth of the root.