珠美海棠(Malus zumi)系苹果属小苹果类植物,原产于日本北部山区,是毛山荆子和三叶海棠野生杂交种,也是一种重要的野生果树资源。以往由于种子少,播种繁殖困难,目前经过天津农学院赵惠祥教授用生物技术进行试管快速繁殖,已获得大量的克隆珠美海棠自根苗。 试验表明:珠美海棠适应范围广,在试管内pH3的培养基中能正常生长;而在pH8的培养基中生长也很好。在含盐量6‰的土壤中能正常生长,在pH9.2的土壤中也能正常生长。在温室里,高温、高湿的生长条件下,一般M系的苹果砧木,如M7、M26、M4都感染白粉病, Malus zumi is a small apple plant native to Japan’s northern mountainous area. It is a wild cross between Maustris angustifolia and Malus zumi and is also an important wild fruit tree resource. In the past, due to the small number of seeds, sowing and breeding difficulties, now through the Tianjin Agricultural College Professor Zhao Huixiang biotechnology test tube rapid breeding, has received a large number of clone Begonia officinalis. Experiments show that Begonia excels in a wide range of adaptation and can grow normally in a medium with a pH of 3 in a test tube, and grows well in a medium of pH 8. In 6 ‰ salt content in the soil can grow normally, in the soil pH9.2 can grow normally. In greenhouse, high temperature, high humidity growth conditions, the general M system of apple rootstocks, such as M7, M26, M4 are infected with powdery mildew,