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关于苹果树上的凸瘤问题,几个世纪以来人们一直进行着观察研究。它们的存在常被认为是压条和扦插容易繁殖的特征,而被用作选择砧木的一个依据。凸瘤是茎节部形成的一群根原体,起源于形成层内特定部位的根原基,当环境条件有利时,根原体就很快长出不定根。
For the tumor of the apple tree, people have been observing for centuries. Their presence is often regarded as a feature of easy propagation of cuttings and cuttings, and is used as a basis for selecting rootstocks. The knoboma is a group of root primordia formed by the stem nodes that originate from the root primordium of specific sites within the layer. When the environmental conditions are favorable, the root blossoms grow adventitious roots rapidly.