State-of-the-art and Problems of Walnut Propagation Methods

Abstract

At present budding and grafting are the most widely used appro­aches in the production of grafted walnut trees. Poor callus formation in walnut makes it difficult to propagate. Walnut propagation by cuttings is a method difficult to be realized. The presence of high concentration of phenolic compounds in its tissue and their oxidation, is the major reason of using micropropagation as a suitable method. The most commonly used technique is patch budding. Other used methods are bench grafting and hot callus. In the last years hot callus as a technique has been successfully used for propagation of walnut cultivars, but the height of the trees is not enough at the end of the season. A new walnut propagation method is call­ed epicotyl grafting. All the methods of walnut propagation are dis­cussed in the present paper.