日本地少人多,果树资源贫乏。除梨、柿等一些资源原产日本外,大部分果树资源都是从国外引进的。而当前世界上热带林的减少,沙漠化范围的扩大,野生资源随之大量灭绝。先进地区农业生产的发展.导致作物遗传基础趋向单一化,地方品种、珍贵的资源也从地球上迅速地消失。鉴于上述原因,日本对世界果树资源的收集和利用非常重视和关心。农林水产省于1960年拨出专款,成立种苗保 In Japan, there are fewer people and fruit trees are poorly resourced. In addition to some resources such as pears and persimmons originating in Japan, most of the fruit trees are imported from abroad. In the current world, the reduction of tropical forests and the expansion of desertification have resulted in the extinction of wild resources. The development of agricultural production in advanced areas has led to a simplification of the genetic basis of crops and the rapid loss of local varieties and precious resources from the earth. In view of the above reasons, Japan attaches great importance and concern to the collection and utilization of the world’s fruit tree resources. Ministry of Agriculture, Forestry and Fisheries set aside a special fund in 1960 to set up seedling insurance