Submitted to: Germplasm Release
Publication Type: Germplasm Release
Publication Acceptance Date: 1/13/2006
Publication Date: 1/13/2006
Citation: Mou, B., Hayes, R.J., Ryder, E.J. 2006. Release of crisphead lettuce germplasm with resistances to corky root and lettuce mosaic. Germplasm Release. Release of seven breeding lines of crisphead lettuce (Lactuca sativa L.) U.S. Dept. of Agriculture. Agri. Research Service. Interpretive Summary: N/A
Technical Abstract: The Agricultural Research Service, United States Department of Agriculture announces the release of seven breeding lines of crisphead lettuce (Lactuca sativa L.). The lines 04-0344, 04-0350, 04-0353, 04-0363, 04-0368, 04-0375, and 04-0379 have dull, medium-dark-green outer leaves, similar to 'Salinas' and related cultivars. Green color extends close to the core on a partially trimmed head. The interior is creamy yellow. Leaf margins are incised, indented, and mildly undulated. Leaf surface is slightly crinkled or blistered. Outer leaves are broader than long. Heads are well rounded, partially covered, and firm to hard at maturity. Butt is flat, and ribs are flat but become more pointed toward the base. Bases of outer and interior leaves overlap well. Texture is relatively soft and flexible, and inside leaves are crispy. Seeds are black. The lines may be suitable for commercial production, and are suitable for use as sources of resistance to corky root and lettuce mosaic in the development of cultivars and germplasm. They were developed at the United States Agricultural Research Station in Salinas, California, by Beiquan Mou, Ryan J. Hayes, and Edward J. Ryder.