K.-S. Ling and
A. Levi, United States Department of Agriculture–Agricultural Research Service (USDA-ARS), U.S. Vegetable Laboratory, Charleston, SC 29414;
S. Adkins, USDA-ARS, U.S. Horticultural Research Laboratory, Ft. Pierce, FL 34945;
C. S. Kousik, USDA-ARS, U.S. Vegetable Laboratory;
G. Miller, Edisto Research & Education Center, Clemson University, Blackville, SC 29817; and
R. Hassell and
A. P. Keinath, Coastal Research & Education Center, Clemson University, Charleston, SC 29414
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Accepted for publication 14 January 2013.
In an effort to develop bottle gourd (Lagenaria siceraria) as a widely adapted rootstock for watermelon grafting, we sought to identify lines with broad resistance to several cucurbit viruses that are economically important in the United States. Preliminary analysis under greenhouse conditions indicated that the currently available commercial watermelon rootstocks were either highly susceptible or somewhat tolerant to one or more viruses. However, in greenhouse screening, several breeding lines of bottle gourd displayed broad-spectrum resistance to four viruses tested, including Zucchini yellow mosaic virus, Watermelon mosaic virus (WMV), Papaya ringspot virus watermelon strain (PRSV-W), and Squash vein yellowing virus. Resistance to PRSV-W and WMV was confirmed through field trials in two consecutive years at two different locations in South Carolina. Two breeding lines (USVL#1-8 and USVL#5-5) with broad-spectrum virus resistance could be useful materials for watermelon rootstock development.
This article is in the public domain and not copyrightable. It may be freely reprinted with customary crediting of the source. The American Phytopathological Society, 2013.