<正>皂荚,学名Gleditsia sinensis Lam,别名皂角树。苏木科,皂荚属。其树体高大,树姿雄伟,树冠阔大阴浓,可做园林观赏树、庭荫树、行道树等,也是"四旁"绿化的优良树种之一。1形态特征常绿大乔木,高可达30 m,胸径1 m以上。树干皮灰黑色,浅纵裂;枝干有单刺或分枝刺,小枝无毛或仅嫩枝有毛。冬

本文对垂柳的形态特征、生态习性、繁殖栽培、病虫防治、适生范围、园林应用等技术要点做了介绍,总结出该树种是适宜河南省大力发展的优良彩色叶树种。

In this article we choose jujube to Xinzheng ash leaves as experimental material,firstly we extract the DNA from the leaf of infected plant,secondly do the sequencing work of phytoplasma 16SrDNA and then make an analysis after using the method of nested PCR.We can get the result that the phytoplasma of 16SrDNA gene fragment is 1 125bp,through sequence comparison,it shows that the homology of the phytoplasma detected from the jujube plant samples with EY(AY197655) can be up to 99 %,and it must belongs to the group 16SrV.This research can set the classification status for the Jujube phytoplasma and provide theoretical basis for the genetic nature.