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Yushu Li, Zongda Xu, Weiru Yang, Tangren Cheng, Jia Wang, and Qixiang Zhang

increases the FLC transcript level and causes delayed flowering ( Seo et al., 2009 ). SOC1 belongs to the TM3 clade of MADS-box genes, which possess a highly conserved DNA-binding domain and is conserved among angiosperms including both monocotyledons

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James D. McCreight and William M. Wintermantel

to CYSDV in PI 313970 is controlled by a single recessive gene. The four different F 1 and three different BC TM progenies included in the three tests were similar in their reactions to ‘Top Mark’, and the F 2 and BC PI progenies segregated as

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Dilip R. Panthee

HM-Clause Seeds. Seeds of this line were provided by the tomato breeder of HM-Clause to make crosses with NCSU tomato breeding lines as a source of ToMV resistance ( Tm-2 gene). It is also resistant to LB ( Ph-2 and Ph-3 genes). The crimson gene

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Dilip R. Panthee

( Mi gene). HM-Clause Seeds (Davis, CA) donated the HM-18 parent line as pollen for making crosses. It is resistant to Tomato mosaic virus ( Tm-2 gene) and Tomato spotted wilt virus ( Sw-5 gene). It also has a crimson gene, making the interior

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Konstantinos Anagnostou, Molly Kyle, and Rafael Perl-Treves

We have studied the relationship of resistance to watermelon mosaic virus (WMV), zucchini yellow mosaic virus (ZYMV), papaya ringspot virus (PRSV), and powdery mildew (PM) in melon (Cucumis melo). We have confirmed monogenic dominant inheritance of these four resistances and report that PI414723-4S3, which was initially selected as a source of ZYMR, is also a source of dominant monogenic resistance to PRSV. Further, we observed departure from independent assortment for resistance to WMV and ZYMV in a study of 73 (UC Top Mark × PI414723-4S3) F3 families (χ2 = 39.87 significant at both 0.01 and 0.05 levels), indicating linkage between Wmv and Zym. The map distance between these resistance genes calculated from the number of recombinant families (RF% = 9.58) was 10.5 cM. Compari-sons among WMV, PM, ZYMV-PM, PRSV-PM, ZYMV-PRSV, and WMV-PRSV of 48 (TM × PI414723-4S3) F3 families, which were screened with all four pathogens, showed no consistent cosegregation.

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Santiago García-Martínez, Adrián Grau, Aranzazu Alonso, Fernando Rubio, Manuel Valero, and Juan J. Ruiz

Spanish landraces has already resulted in the release of two breeding lines, UMH 1200 and UMH 1203, both homozygous for Tm-2 a , Ty-1, and Sw-5 genes ( García-Martínez et al., 2011 , 2012 ). These breeding lines allow farmers to obtain acceptable

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Santiago García-Martínez, Adrián Grau, Aranzazu Alonso, Fernando Rubio, Pedro Carbonell, and Juan J. Ruiz

program for the introgression of virus into Spanish landraces has resulted in the release of the UMH 1200 breeding line, homozygous for Tm-2 a , Ty-1 , and Sw-5 genes ( García-Martínez et al., 2011 ). This breeding line allows farmers to obtain an

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Xin Hao, Yu Fu, Wei Zhao, Lifei Liu, Rengui Bade, Agula Hasi, and Jinfeng Hao

, BS, and TM8. In addition to the M domain, MADS-box genes have three other conserved domains: the K domain, which is relatively conserved and characterized by a coiled-coil structure, only exists in type II genes and is the basis of the distinction

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Santiago García-Martínez, Adrián Grau, Aranzazu Alonso, Fernando Rubio, Pedro Carbonell, and Juan J. Ruiz

Miguel Hernández University (Spain). The breeding line UMH 1203, homozygous for Tm-2 a , Ty-1 , and Sw-5 genes, was the first obtained within the ‘De la pera’ tomato type ( García-Martínez et al., 2012 ). This breeding line has enabled farmers to

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Yuanfu Ji, John W. Scott, and David J. Schuster

chromosomes 6 and 3, respectively ( Ji et al., 2007a , 2008 ). The Ty-2 gene is one of the major sources of TYLCV resistance used in tomato breeding programs, but it is not effective against some TYLCV strains in some regions in the world ( Mejía et al