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日本秋田县和青麻县的积雪地区,苹果利用的是MM106砧木。近几年来,日本又从世界各国引进了一些新的抗寒砧木。日本1978年从美国引进的MAC_9,已于1981年被美国正式命名为“马克”(Mark系密执安苹果砧木无性系的缩写)。最近,据美国密执安州立大学R.F.卡尔逊博士的研究报告介绍,“马克”是M_9的自然杂交实生苗,有以下几个特性:①树势介于M_9和M_(26)之间;②根系蔓生,生长良好,可以不要支柱;③对土壤的适应范围较广;
Japan’s Akita Prefecture and Qingma County snow area, Apple is using MM106 rootstock. In recent years, Japan has introduced some new cold-resistant stocks from all over the world. Japan imported from the United States in 1978, MAC_9, was officially named the United States in 1981 as “Mark” (Mark Department of Michigan Apple rootstock clones abbreviation). Recently, according to a research report by Dr. RF Carlson from Michigan State University, “Mark” is a natural hybrid seedling of M_9 with the following characteristics: ① The tree potential is between M_9 and M_ (26); ② Roots vineyards, good growth, you can not pillar; ③ a wider range of adaptation to the soil;