`Equinox' Heat-tolerant Hybrid Tomato

Abstract

results in more reliable marketable fruit production during cooler cropping seasons. Origin 'Equinox' was tested as Fla. 7249B and is a hybrid resulting from the Fla. 7324 x Fla. 7060 cross. The pollen parent was tested as Fla. 7249B (Fig. 1). Fla. 7060 also was the pollen parent in 'Solar Set', and its background has been described by Scott et al. (1989). Fl. 7060 was the seed parent cited in the release circular, but subsequently the parentage was reversed due to germination sensitivity in Fla. 7060, which was transferred maternally to 'Solar Set'. 'Solar Set' contributes large fruit size and good flavor to the hybrid. Fla. 7324 is the seed parent and contributes heat-tolerant fruit set and major components of blossom scar smoothness and crack resistance. The major source of heat tolerance in Fla. 7324 is from 'Campbell 28', although heat tolerance was enhanced by crosses with other lines, all of which are heat sensitive. Florida line 626 is similar to 'Florida 1A' (Augustine et al., 1981) and Florida line 648, which has been described briefly by Scott et al. (1985). Fla. 7057 is a jointless breeding line with firm fruit, used to increase the fruit size and firmness of the heat-tolerant inbred to which it was crossed. Description Vines of 'Equinox' are determinate (sp), similar in size to those of 'Solar Set' and smaller than those of 'Sunny' or 'Agriset 761',

Mapping quantitative trait loci for heat tolerance of reproductive traits in tomato (Solanum lycopersicum)

“…A number of studies have assessed tomato cultivars for fruit set under CMH condition and identified relatively well-performing genotypes (Levy et al 1978 ; Dane et al 1991 ; Sato et al 2000 ; Sato et al 2004 ; Bhattarai et al 2016 ). The largest, multi-year characterisations by the Asian Vegetable Research and Development Center (AVRDC) identified 39 tolerant lines, some of which have already been utilised in tomato breeding programs (Opeña et al 1992 ; Scott et al 1995 ; Gardner 2000 ). However, to be able to efficiently use variation in heat tolerance for fundamental and applied aims, it is necessary to have knowledge on the genetic basis of the trait.…”

Genome Mapping and Molecular Breeding of Tomato

“…These species, which are mostly self incompatible and produce green fruit, have been rather partial in their usefulness to cultivated forms due to various barriers present in sexual hybridization and gene transfer. However, they can be hybridized with members of the esculentum complex by the application of techniques such as embryo rescue [ 23 , 24 , 32 ] or by the use of pollen mixtue (with tomato pollen) when fertilizing tomato plants [ 33 ]. There are documented examples of crosses with peruvianum complex which have been utilized in tomato breeding, including transfer of tobacco mosaic virus and nematode resistance [ 30 , 34 ].…”

Bulked segregant analysis to detect quantitative trait loci (QTL) related to heat tolerance at grain filling rate in wheat using simple sequence repeat (SSR) markers

“…It is unfortunate that the literature contains relatively little information on breeding for heat tolerance in different crop species. However, despite all the complexity of heat tolerance and difficulties encountered during transfer of tolerance, some heat-tolerant inbred lines and hybrid cultivars with commercial acceptability have been developed and released, at least in a few crop species such as tomato (Scott et al, 1986(Scott et al, , 1995. Composite interval mapping (CIM) has been used in the present investigation for mapping QTLs associated with heat tolerance using pooled bulks from the F 2 population of Ksu106 (heat tolerant)/Yecora Rojo (heat-sensitive) cross.…”