Walnut (Juglans)

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Abstract

Walnut species are important nut and timber producers in temperate regions of Europe, Asia, South America, and North America. Trees can be impacted by Phytophthora, crown gall, nematodes, Armillaria, and cherry leaf roll virus; nuts can be severely damaged by codling moth, husk fl y, and Xanthomonas blight. The long generation time of walnuts and an absence of identifi ed natural resistance for most of these problems suggest biotechnological approaches to crop improvement. Described here is a somatic embryo-based transformation protocol that has been used to successfully insert horticulturally useful traits into walnut. Selection is based on the combined use of the selectable neomycin phosphotransferase (npt II) gene and the scorable uid A gene. Transformed embryos can be germinated or micropropagated and rooted for plant production. The method described has been used to establish fi eld trials of mature trees.

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Leslie, C. A., Walawage, S. L., Uratsu, S. L., McGranahan, G., & Dandekar, A. M. (2015). Walnut (Juglans). Methods in Molecular Biology, 1224, 229–241. https://doi.org/10.1007/978-1-4939-1658-0_19

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