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Submitted to: Eucarpia Cucurbitaceae Symposium Proceedings
Publication Type: Peer Reviewed Journal Publication Acceptance Date: 1/15/2004 Publication Date: 7/20/2004 Citation: Mccreight, J.D. Progress in breeding melon for resistance to lettuce infectious yelows virus. Proceedings of Cucurbitaceae 2004, 8th Eucarpia meeting on Cucurbit Genetics and Breeding, Lebeda, A., Paris, H.S. (eds.)Palacky University in Olomouc, Czech Republic. 2004. p. 219-222. Interpretive Summary: Lettuce infectious yellows virus caused severe losses to lettuce and melon production in the lower desert melon valleys of Arizona and California during the 1980s. Resistance to lettuce infectious yellows virus is being transferred from melon PI 313970, a vegetable-type melon from India, to western U.S. shipping type orange flesh cantaloupe. Although resistance is inherited as a single dominant gene, uncertainty of symptom expression requires use of laboratory assays for the virus and to indicator host plants to verify infection in each backcross generation. Straight backcrossing of selected putative resistant individuals has been carried through the fourth backcross generation. Selection has also been made for resistance to powdery mildew race 2U.S. Technical Abstract: Resistance to lettuce infectious yellows closterovirus is being transferred from PI 313970 to western U.S. shipping type orange flesh cantaloupe. Although resistance is inherited as a single dominant gene, uncertainty of symptom expression requires use of ELISA assays and serial transfers to indicator plants in order to reduce false negative and false positive segregants in each backcross generation. Straight backcrossing of selected putative resistant individuals has been carried through the fourth backcross: 'Top Mark' (BC1), 'PMR 5' (BC2), and breeding line AR 5 (BC3 and BC4). Selection has also been made for resistance to powdery mildew race 2U.S. found in 'PMR 5', AR 5 and PI 313970. |
