Studies On Test Guideline To New Varieties On Distinctness, Uniformity And Stability (DUS) And Database To Existing Varieties Of Chaenomeles

Chaenomeles is not only a well-known ornamental flower, but also traditional Chinese medicine plant; they have a long cultural history and rich germless resources. But studies on test guideline on DUS and database to existing varieties of were vacancies . On the base of the development of the DUS testing system, the necessity and importance on designing the new varieties of testing system and establishing the database varieties of common knowledge were discussed. Based on the investigation of Chaenomeles, which is on the Forestry Plants New Varieties Protection List of China, the DUS testing guidelines for new varieties of Chaenomeles and the database to existing varieties were established. The main results were summarized as follows:(1) On the basis of consulting documents and information, theories about new varieties protection and DUS testing were studied carefully. The current situation of protection of new varieties and DUS testing guidelines were reviewed. The selection of testing characteristics was analyzed, and some suggestions were proposed on solving problems existed in it. An outlook of new technology and method using DUS testing was raised, such as molecule marker technology.(2) Through the investigation of Chaenomeles varieties in Shandong, Jiangsu and so on, 63 varieties with detailed characteristics were got. Morphological characteristics were analyzed and previous records were added and fixed.(3) The selection principles of example varieties were discussed based on UPOV assessment system and the peculiarity of Chaenomeles. The stability and relevance of characteristics were analyzed. Fourteen example varieties and thirty-one testing characteristics were selected for DUS testing. Twenty-four characteristics were of asterisked as well as seven characteristics of supportive. The identification standard for DUS was put forward. The test guidelines for new varieties of Chaenomeles was established.(4) Combined with investigation and pervious information, 63 varieties were picked out as existed. Referred to the testing characteristics and the grouping principles in test guidelines, Feature information of the database were drawled up. On the basis of this database to Chaenomeles varieties was established.