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从50年代开始,美国在果树的矮密栽培中,逐渐地由引入试种英国的 M 系和 MM 系转入积极地利用本国资源,进行更适应于本国风土条件的矮化砧木的选育工作。其特点是选用一些土生土长的野生、半野生或栽培品种(当然必须是经过长期的实践,证明确
Beginning in the 1950s, the United States shifted its efforts to cultivate dwarf trees in fruit trees and gradually switched from using the M and MM lines that were introduced to test the UK to actively utilize their own resources to carry out the breeding of dwarfing rootstocks that are more adapted to their own terroir . It is characterized by the selection of some indigenous wild, semi-wild or cultivated varieties (of course, must be after long-term practice to prove that