- Author: Tracy Kahn
- Author: Georgios Vidalakis
Two programs at the University of California-Riverside are working together to provide information on new and existing varieties of citrus as well as information on other types of citrus diversity.
The University of California-Riverside Citrus Variety Collection (CVC) is one of the most diverse living collections of citrus varieties and related genera in the world. This collection encompasses varieties and species of genera in the Aurantiodeae subfamily of the Rutaceae (citrus). With two field trees of each of the over 1000 different types, this collection preserves valuable citrus types for research and to extend knowledge about citrus and citrus diversity. Although the main focus of the Citrus Variety Collection focus is to conduct research on new citrus varieties and facilitate the use of the collection for research by researchers, we also extend knowledge about citrus diversity by writing articles and providing a website with information about the different types of citrus in our collection: www.citrusvariety.ucr.edu Toni Siebert, David Karp and Tracy Kahn with the Citrus Variety Collection are in the process of “growing” our website to provide information and photographs of all of the different types in the collection. Please visit our website to learn more about other types citrus in the collection. Our website also has links to other citrus articles, references and citrus related information as well as a history of the collection and how you can help support the collection to preserve citrus diversity for the future.
The University of California-Riverside Citrus Clonal Protection Program (CCPP) is a cooperative program with federal, state, and citrus industry agencies and its purpose is to provide a safe mechanism for the introduction into California of citrus varieties from any citrus-growing area of the world. This procedure is highly regulated by federal and state law and only three programs in the whole country have authorization to introduce citrus varieties into the USA. The citrus variety introduction mechanism is complex and highly specialized and includes, disease diagnosis and pathogen elimination followed by maintenance and distribution of true to type, primary citrus propagative material. Currently the CCPP germplasm collection extents in more than 20 acres and contains over 1,200 trees representing over 350 different commercially important scion and rootstock varieties. The trees in the CCPP collection are constantly evaluated for several horticultural characteristics such as vegetative growth, fruit yield, and fruit quality. All the information related to the variety evaluation along with budwood distribution, citrus disease and citrus management issues is available to the public via the web site www.ccpp.ucr.edu.
The University of California-Riverside CVC and CCPP are in close collaboration and citrus variety information is exchanged between their websites. In the near future a dynamic data-based website will be launched enabling the users to query from the web pages of both the CVC and the CCPP at one time in order to answer specific questions and to compare variety data from either or both websites.