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
Abstract
Germplasm sources for resistance to tobacco mosaic virus-induced blotchy ripening of greenhouse tomato (Lycopersicon esculentum Mill.) were tested in hybrid combinations using a virus strain belonging to Pelham Group I. Breeding lines possessing Tm-2 or Tm-2a genes contributed high tolerance against TMV infection based on both leaf and fruit symptoms. ‘Perou 2’ (Tm-2), Ohio MR-13 (Tm-2 a), and Ohio MR-12 (Tm-2a ) and hybrids involving these lines were tolerant to the virus. Significant dominance for tolerance was observed in most hybrids heterozygous at the Tm-2 or Tm-2a locus. Tm-1 gene sources were not very effective in controlling blotchiness.
exhibited CuLCrV symptoms was lower: 67% and 28% of ‘Top Mark’ and PI 313970, respectively (F 2 : 52%, BC TM : 54%, BC PI : 9%). Several cultivated cucurbit species exhibited recovery, most likely mediated by gene silencing and methylation. This was
Abstract
The Tm-2a gene and probably the Tm-2 gene, both of which confer resistance to tobacco mosaic virus (TMV), were used to develop fresh-market type red tomato (Lycopersicon esculentum Mill.) lines. Crosses were made between lines carrying these genes and susceptible fresh-market type tomato cultivars. Progenies were screened for resistance to TMV by inoculating with 5 known Ohio strains and inheritance was studied at 17° and 28°C. The highest level of resistance to all virus strains was obtained when the 2 resistant genes were combined in a single cross.
Abstract
‘Auburn 76’ FMN, herein referred to as ‘AU 76’, is an indeterminate true breeding fresh market tomato cultivar named in honor of America’s Bicentennial and released by the Alabama Agricultural Experiment Station (Fig. 1). ‘AU 76’ possesses 3 dominant genes (I, Tm2a and Mi) conditioning, respectively, near-immunity to both Fusarium race 1 (F) and tobacco mosaic virus (M), and resistance to root knot nematodes (N).
oxysporum f.sp. lycopersici (Sacc.) Snyd. and Hans.) (races 1 and 2) ( I/I and I-2/I-2 genes), late blight (LB) ( Ph-2/ph-2 and Ph-3/ph-3 genes), Tomato mosaic virus (ToMV) ( Tm2/tm2 gene), and Tomato spotted wilt virus (TSWV) ( Sw-5/sw-5 gene
f.sp. lycopersici (Sacc.) Snyd. and Hans.] races 1, 2, and 3 ( I, I-2 , and I-3 genes); root-knot nematodes ( Meloidogyne spp., Mi gene); Tomato mosaic virus ( Tm-2 gene); and Tomato spotted wilt virus ( Sw-5 gene). Origin The
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.
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 ( GarcÃa-MartÃnez et al., 2011 , 2012 ). These breeding lines allow farmers to obtain acceptable
subfamily and were distributed in 10 subclasses: SEP (5 members), AGL6 (2), AP1/FUL (2), SCO1 (5), AG (5), AGL17 (4), AGL15 (2), AP3/PI (2), SVP (8), and FLC (1); there were no genes in the AGL12, BS, TM8, and MIKC* groups ( Fig. 4 ). Meanwhile, we collected