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Rengong Meng and Chad Finn

work and the USDA-ARS National Clonal Germplasm Repository (Corvallis, Ore.) for providing plant material.

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Karen A. Williams

helpful comments of Michael Dosmann. I would like to acknowledge Allan Stoner and Ned Garvey of the USDA-ARS National Germplasm Resources Laboratory for their support of the Plant Exploration Program. I would like to thank Judi duCellier for producing the

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Kirk W. Pomper, Sheri B. Crabtree, Shawn P. Brown, Snake C. Jones, Tera M. Bonney, and Desmond R. Layne

1 Principal investigator of horticulture and curator, USDA National Clonal Germplasm Repository for Asimina spp., Kentucky State University, and President of The PawPaw Foundation. To whom reprint requests should be addressed. 2 Research assistant

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Jason D. Zurn, Katie A. Carter, Melinda H. Yin, Margaret Worthington, John R. Clark, Chad E. Finn, and Nahla Bassil

parentage and distinguish seedlings of breeding populations from the University of Arkansas and the USDA-ARS Horticultural Crops Research Unit breeding programs; to develop an improved fingerprinting set, if needed; and to evaluate the new set for germplasm

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Kim E. Hummer

BEGINNINGS OF THE NATIONAL PLANT GERMPLASM SYSTEM In 1898, the U.S. Department of Agriculture (USDA) Division of Botany, Bureau of Plant Industry established a “Seed and Plant Introduction Section” to acquire new germplasm for the United States

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Beiquan Mou

currently grown on ≈25,000 ha in the United States annually for both fresh and processed markets with a crop value of $190 million ( National Agricultural Statistics Service, USDA, 2006 ). In addition to its high nutrient content, spinach is also known to

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Beiquan Mou, Steven T. Koike, and Lindsey J. du Toit

susceptibility could be very useful in developing S. botryosum -resistant spinach cultivars. Materials and Methods Public germplasm collection. Experiments were conducted at the Agricultural Research Station of the USDA, Salinas, CA. The entire

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Ying Wang, Cale A. Bigelow, and Yiwei Jiang

of this study was to determine the ploidy level and DNA content of the 194 USDA National Plant Germplasm System (NPGS) perennial ryegrass accessions and six commercial cultivars using flow cytometry. Materials and Methods Plant materials

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Thomas G. Beckman, Philip A. Rollins, James Pitts, Dario J. Chavez, and Jose X. Chaparro

After the release of Guardian ® in 1993 ( Okie et al., 1994a ), the USDA-ARS peach rootstock breeding program at Byron, GA, shifted its emphasis to combining resistance to PTSL, ARR, and several species of root-knot nematodes into a single

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Florence A. Becot, Virginia Nickerson, David S. Conner, and Jane M. Kolodinsky

( USDA, 2011 ), and better tracking of outbreaks ( Mead et al., 1999 ). Nevertheless, improving food safety of fresh produce should remain a focus of all actors involved in the production, distribution, and preparation of fresh produce. GAPs were