Cucumber downy mildew, which is caused by Pseudoperonospora cubensis Rostow, is one of main diseases in cucumber product. It was firstly discovered in 1868, and had a serious development recently. Methods of control downy mildew included utilizing medicine and closing a greenhouse at high temperature, but were ultimately to produce resistant varieties. So cloning and marking the resistance gene of the downy mildew in cucumber are fundaments for disease resistance breeding of cucumber.
The study con...