Table Grape ‘Suok’

in HortScience

‘Suok’ (‘Kyoho’ × ‘Beniizu’) is a tetraploid (4×) table grape cultivar showing large berries with high quality. ‘Suok’ has a mean bud burst on 17 Apr., flowering on 31 May, and fruit maturity on 15 Sept. The mean berry weight is 10.9 g, and mean soluble solids are 18.5 °Brix. The skin color is black with abundant bloom and the flesh is soft and juicy.

Origin

‘Suok’ resulted from a cross between and ‘Kyoho’ (4×) and ‘Beniizu’ (4×) with the intention of producing high-quality table grapes with the taste of ‘Kyoho’ at the National Horticultural Research Institute (NHRI), RDA, Korea, in 1992 (Fig. 1). It was preliminarily selected in 2000, tested in seven sites from 2001 to 2004 as ‘Wonkyo RA-18’, and named in 2004. Three randomized vines were planted and tested to evaluate characters of vines and fruit production in each site for 4 years.

Fig. 1.
Fig. 1.

Pedigree of ‘Suok’ grape.

Citation: HortScience horts 43, 7; 10.21273/HORTSCI.43.7.2224

Description

Flowers.

Flowers of ‘Suok’ are perfect and self-fertile, blooming at midseason (on 31 May in Suwon, Korea) after midseason bud break (17 Apr.).

Fruits.

Fruits of ‘Suok’ have black–blue skin when fully ripened. Fruits are large in size averaging 10.9 g, similar to ‘Kyoho’, and are round to slightly ovate. When the grapes are fully ripened, the aroma of ‘Suok’ is very similar to that of ‘Kyoho’ with a pronounced foxy flavor. ‘Suok’ ripens between 22 Sept. and 25 Sept. in Suwon, Korea, 8 d later than ‘Kyoho’. It is considered a late-season cultivar. The mean total soluble solids (TSS) of ‘Suok’ are 18.5 °Brix, ≈2.1 °Brix higher than ‘Kyoho’, and pH is usually similar to ‘Kyoho’ (Table 1). The balance between sugar (18.5 °Brix) and acidity (0.62% titratable acidity, pH 3.12) is excellent. These indicate that ‘Suok’ can accumulate satisfactory amounts of sugar while maintaining sufficient acidity. Its berry has two to four seeds of 8.0 mm in length, and its skin is slip, pulpy, and medium in thickness. The flesh texture is soft and juicy. ‘Suok’ is a late-season grape variety, which produces fruits with long shelf life compare with ‘Kyoho’. It is possible to produce seedless berries by the gibberellic acid treatment (25 ppm in full bloom) in ‘Suok’, like in ‘Kyoho’.

Table 1.

Fruit characteristics of grape cultivar Suok and its parent ‘Kyoho’.

Table 1.

Clusters.

The clusters of ‘Suok’ are large in size (400 to 450 g with 35 to 40 berries each), conical, and sometimes shouldered. The berries are set very tightly with no shattering, which causes their low marketability with bad appearance of clusters in ‘Kyoho’ grape. The cluster appearance is excellent with a uniform shape and black skin color (Fig. 2).

Fig. 2.
Fig. 2.

Fruit cluster of grape cultivar Suok at full maturity.

Citation: HortScience horts 43, 7; 10.21273/HORTSCI.43.7.2224

Vines.

Own-rooted vines are vigorous and more productive than 20 Mt·ha−1 in total yield than ‘Kyoho’ (18 Mt·ha−1) in randomly designed blocks. Vines show uniform clusters in size and ripening period with excellent berry setting by cane pruning. Vines are moderately hardy to cold with 40% to 50% survival of buds at –20 °C in Suwon, Korea.

Diseases.

The foliage is moderately susceptible to anthracnose (Elsinoe ampelina Shear) and downy mildew (Plasmopara viticola Berl. & de Toni). However, the trunk is moderately resistant to crown gall (Agrobacterium vitis). After fruit harvest, it is required to keep as many healthy leaves as possible on the vines to maintain sufficient nutrient for good plant growth in the next year. Although own-rooted vines of ‘Suok’ grape were cultivated in the vineyard, they were not infested with phylloxera owing to low risk for natural attacks by them in the soil in Korea.

‘Suok’ is a table grape with large berries, which produce fruits with pronounced varietal characteristics similar to ‘Kyoho’, one of its parents. ‘Suok’ is distinguished by its superior fruit quality combined with good productivity and partial resistance to crown gall disease superior to its acclaimed parent, ‘Kyoho’. ‘Suok’, which means “excellent gem” in Korean, is the eighth table grape cultivar named by NHRI. It follows the release of ‘Cheongsoo’ (Lee et al., 1994), ‘Hongdan’ (Suh et al., 1995), ‘Tamnara’ (Park et al., 2004a), ‘Heukgoosul’ (Park et al., 2004b), ‘Hongisul’ (Park et al., 2006a), ‘Heukboseok’ (Park et al., 2006b), and ‘Jinok’ (Yun et al., 2008). ‘Suok’ may be used as a substitute for ‘Kyoho’ in grape cultivation in Korea as a result of its large-sized berries with high quality and several characteristics for facilitating vineyard management such as excellent coloring of skins and easy bearing habit.

Availability

Requests for cuttings for research purposes may be addressed to Haekeun Yun (hekeun@rda.go.kr). Vines are available for sale at the Korean Society for Fruit Tree Nursery (4-38 Seonghwang-dong Cheonan, 330-130, Korea).

Literature Cited

  • LeeD.K.SuhH.S.ParkK.S.LeeC.H.MoonJ.Y.YaeB.W.HwangH.S.KimJ.H.KimJ.C.LeeJ.C.KimY.K.1994‘Cheongsoo’ a new mid-season ripening table grape cultivar with high qualityKor. J. Hort. Sci. Technol.12144145(abstr.).

    • Search Google Scholar
    • Export Citation
  • ParkK.S.YunH.K.SuhH.S.2006aRed table grape ‘Hongisul’J. Amer. Pom. Soc.602829

  • ParkK.S.YunH.K.SuhH.S.2006bBlack table grape ‘Heukboseok’J. Amer. Pom. Soc.603031

  • ParkK.S.YunH.K.SuhH.S.JeongS.B.ChoH.M.2004aBreeding of early season grape cultivar ‘Tamnara’ (Vitis hybrid) with high quality and disease resistanceKor. J. Hort. Sci. Technol.22458461

    • Search Google Scholar
    • Export Citation
  • ParkK.S.YunH.K.SuhH.S.JeongS.B.ChoH.M.2004bBreeding of black table grape cultivar ‘Heukgoosul’ (Vitis sp.) with large berries and high qualityKor. J. Hort. Sci. Technol.22462466

    • Search Google Scholar
    • Export Citation
  • SuhH.S.LeeD.K.ParkK.S.LeeJ.S.MoonJ.Y.KimJ.H.KimS.B.KimY.K.1995High quality early season grape cultivar ‘Hongdan’ for off-season fresh marketKor. J. Hort. Sci. Technol.13188189(abstr.).

    • Search Google Scholar
    • Export Citation
  • YunH.K.ParkK.S.RohJ.H.KwackY.B.JunJ.H.JeongS.T.JangH.I.KimS.H.ShinY.U.2008Table grape ‘Jinok’HortScience4322222223

If the inline PDF is not rendering correctly, you can download the PDF file here.

Contributor Notes

This research was supported in part by MAF/ARPC through the Grape Research Project Group.

To whom reprint requests should be addressed; e-mail hekeun@rda.go.kr

Article Sections

Article Figures

Article References

  • LeeD.K.SuhH.S.ParkK.S.LeeC.H.MoonJ.Y.YaeB.W.HwangH.S.KimJ.H.KimJ.C.LeeJ.C.KimY.K.1994‘Cheongsoo’ a new mid-season ripening table grape cultivar with high qualityKor. J. Hort. Sci. Technol.12144145(abstr.).

    • Search Google Scholar
    • Export Citation
  • ParkK.S.YunH.K.SuhH.S.2006aRed table grape ‘Hongisul’J. Amer. Pom. Soc.602829

  • ParkK.S.YunH.K.SuhH.S.2006bBlack table grape ‘Heukboseok’J. Amer. Pom. Soc.603031

  • ParkK.S.YunH.K.SuhH.S.JeongS.B.ChoH.M.2004aBreeding of early season grape cultivar ‘Tamnara’ (Vitis hybrid) with high quality and disease resistanceKor. J. Hort. Sci. Technol.22458461

    • Search Google Scholar
    • Export Citation
  • ParkK.S.YunH.K.SuhH.S.JeongS.B.ChoH.M.2004bBreeding of black table grape cultivar ‘Heukgoosul’ (Vitis sp.) with large berries and high qualityKor. J. Hort. Sci. Technol.22462466

    • Search Google Scholar
    • Export Citation
  • SuhH.S.LeeD.K.ParkK.S.LeeJ.S.MoonJ.Y.KimJ.H.KimS.B.KimY.K.1995High quality early season grape cultivar ‘Hongdan’ for off-season fresh marketKor. J. Hort. Sci. Technol.13188189(abstr.).

    • Search Google Scholar
    • Export Citation
  • YunH.K.ParkK.S.RohJ.H.KwackY.B.JunJ.H.JeongS.T.JangH.I.KimS.H.ShinY.U.2008Table grape ‘Jinok’HortScience4322222223

Article Information

Google Scholar

Related Content

Article Metrics

All Time Past Year Past 30 Days
Abstract Views 0 0 0
Full Text Views 59 59 2
PDF Downloads 17 17 4