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Richard L. Fery and Judy A. Thies

-cultivar quality parental line that is homozygous for the southern root-knot nematode resistance gene. Origin In 1995, recurrent backcross breeding procedures were initiated to transfer the dominant southern root-knot nematode resistance gene from a Scotch Bonnet

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Richard L. Fery and Judy A. Thies

incorporate the dominant root-knot nematode resistance gene ( N ) into the classical pimento-type “Perfection” genetic background ( Fig. 1 ) ( Fery and Dukes, 1996 ; Hare, 1957 ). The donor parent of the N resistance gene was ‘Mississippi Nemaheart’ and the

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Arthur Villordon and Christopher Clark

al., 1994 ; Lawrence et al., 1986 ), there is a lack of information on how infection affects RSA in either susceptible or resistant genotypes. Thus, it is important to understand the relationship between RSA and nematode resistance in sweetpotato

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Samuel F. Hutton, John W. Scott, and Joshua H. Freeman

commercial hybrid, ‘Tygress’. ‘Tygress’ contains a very large wild-species introgression (≈30 Mb) on chromosome 6—which couples the S. peruvianum nematode-resistance introgression ( Mi gene) together with the S. chilense begomovirus

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Samuel F. Hutton and John W. Scott

3 recombinant inbred line (RIL) developed from the commercial hybrid, Tygress. This hybrid is heterozygous for a very large wild-species introgression (≈30 Mb) on chromosome 6, which resulted from recombining nematode resistance ( Mi ) with

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Randy G. Gardner and Dilip R. Panthee

for root knot nematode resistance and the I-3 gene for fusarium wilt race 3 resistance. Replicated plots of the F 3 generation were grown in two growers’ fields in coastal South Carolina in 2001 under conditions of heavy natural infection by TSWV to

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Ke Cao, Lirong Wang, Gengrui Zhu, Weichao Fang, Chenwen Chen, and Pei Zhao

against the Pp whole genome sequence (Version 1.0; Washington State University, 2010a ) was used to infer their location on specific chromosomes. The RGAs with same alignment results were thought as a “false” RGA. Results Root-knot nematode resistance

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Andrew P. Nyczepir, Janete A. Brito, Don W. Dickson, and Thomas G. Beckman

severe damage on root-knot nematode-resistant soybean ‘Forrest’ and sweetpotato ‘CDH’ cultivars ( Fargette, 1987 ; Fargette et al., 1996 ) and on tomato ‘Rossol’, which contains the Mi-1 nematode resistance gene ( Prot, 1984 ). Brito et al. (2004

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William B. Rutter, Chandrasekar S. Kousik, Judy A. Thies, Mark W. Farnham, and Richard L. Fery

Growers Company (Rocky Ford, CO) ( Fig. 1 ). PA-593 was derived from a single BC 3 F 4 plant grown in 2014, and is homozygous for the dominant N nematode resistance gene. The N gene conditions a high level of resistance against several RKNs, including

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Yiqun Weng

were unsuccessful ( Deakin et al., 1971 ; Fassuliotis, 1977 , 1979 ; Walters and Wehner, 2002 ). An alternative strategy may be through comparative genetic mapping of target genes such as nematode resistance in C. metuliferus using cross