Sun, Lei

Xu, Hai-Ying

Yan, Ai-Ling

Zhang, Guo-Jun

English

JKI Open Journal Systems (Julius Kühn-Institut)

Vitis 50 (4), 183–184 (2011)Research Note'Ruiduwuheyi Seedless': A new late-maturing seedless table grapeHAI-YING XU, GUO-JUN ZHANG, AI-LING YAN and LEI SUN  Institute of Forestry and Pomology, Beijing Academy of Agriculture and Forestry Science, Beijing, ChinaK e y   w o r d s :   fresh market, table grape, cultivars.Introduction: Chinese consumers prefer seedless grape cultivars. The foreign cultivars such as ‘Autumn Royal’, ‘Superior Seedless’, and ‘Crimson Seedless’ (DAVID 1995) show different adaptation responses to the local environ-ment. The natural berry size of domestic seedless cultivars is usually small. The ‘Ruiduwuheyi Seedless’ grape (Vitis vinifera L.) is a late-season, attractive, red seedless grape with naturally large and firm berries (Fig. 1). In the cur-rent study, the average bud break date is April 23rd, average bloom date is May 29th, and typically harvest is September 15th. The cultivar, released in 2010, has a sweet crisp flavor and is a good seedless alternative for table grape produc-tion in northern China.brid seedlings were planted in a vineyard, among which 10 vines produced seedless berries. The original plant was preliminarily selected in 2003 from the 10 vines and tested as ‘17-13-3’. 20 buds were grafted on the rootstock for trials in 2004. The plantings were spaced 2 x 3 me-ters. The asexually reproduced vines first produced fruit in 2005, yielding 4,500-7,500 kg·ha-1; in 2006, the yield was 9,000-1,500 kg·ha-1.Results and Discussion: ‘Ruiduwuheyi Seedless’ vines are moderate to vigorous on their own roots, with relatively short internodes and good productivity when spur-pruned. On the average, it ripens during middle to late September in Beijing. The cluster is medium-sized, well-filled to compact, has an average weight of 459 g, and is conical-shaped with a shoulder. The round to oval-shaped berry weights on average 6.2 g with a maximum weight of 11.4 g, and is 21.8 mm in diameter and 24.3 mm in length. In comparison, ‘Ruby Seedless’ has a natural berry that weights only 2.5 g, 15.0 mm in diameter, and 17.7 mm in length. The berries are not sensitive to gibberellins. The pe-duncle of the ‘Ruiduwuheyi Seedless’ grape is medium in diameter and length, averaging 3.9 cm. The pedicel, with an average of 0.7 cm, is medium in length. The berries are reddish-purple in color with light white bloom. The flesh is firm and crisp with an excellent flavor and does not sepa-rate from the skin. The average soluble solid content of ‘Ruiduwuheyi Seedless’ is 16.2 %. For commercial pro-duction, the cluster size of this grape should be thinned to 70-90 berries. These grapes mature relatively earlier than ‘Ruby Seedless’ grapes. The vine has the characteristics of early fruiting and easy management. Correspondence to: Prof. HAI-YING XU, Institute of Forestry and Pomology, Beijing Academy of Agriculture and Forestry Science, Beijing, 100093, China. E-mail: haiyingxu63@sina.comFig. 1: Cluster of 'Ruiduwuheyi Seedless' grape.Material and Methods: The table grape breeding pro-gram is based at the Institute of Forestry and Pomology in Beijing (39°58’ N and 116°13’ E), where the winter tem-perature is usually between 0 and -10 °C and summer tem-perature ranges from 32-36 °C. ‘Ruiduwuheyi Seedless’ is the result of three generations of hybridization in 1997 (Fig. 2). The progeny of ‘Muscat Hamburg’ and ‘Pearl of Csaba’ was hybridized with ‘Cardinal’ to obtain ‘Xiang-fei’ (XU, 2001), which is the seed parent of ‘Ruiduwuheyi Seedless’. The seedlessness of ‘Ruiduwuheyi Seedless’ is attributed to its pollen parent, ‘Ruby Seedless’. 84 hy-Fig. 2: Pedigree of 'Ruiduwuheyi Seedless' grape. T a b l eFruit characteristics of the two cultivars during 2006-2008 at the Institute of Forestry and Pomology, BeijingxYear CharacteristicRuiduwuheyi SeedlessRuby Seedless2006 Soluble solids (%) 18.0ay 19.1aCluster weight (g) 359.2a 396.5bBerry weight (g) 4.3a 2.5bHarvest date Sep 27 Sep 272007 Soluble solids (%) 19.5a 22.0bCluster weight (g) 423.3a 513.5bBerry weight (g) 5.1a 2.5bHarvest date Sep 27 Sep 282008 Soluble solids (%) 15.2a 20.0bCluster weight (g) 518.1a 513.3aBerry weight (g) 7.4a 2.8bHarvest date July 3z Sep 28x Data are the means from 20 vines of each cultivar with  10 berries per vine.y Mean separation within columns by Duncan’s multiple range   test, p < 0.05.z No fruit in the field due to the bad weather that year; data  obtained were from the greenhouse.  184 LEI SUN et al.This research was supported by the Earmarked Fund for Chi-na Agriculture Research System (CARS-30-yz-3) and Training Program for Excellent Talents in Beijing (20104D002020000007). Passport data on this cultivar can be found under "variety number VIVC 23378" in the Vitis International Variety Catalogue (http://www.vivc.de).DAVID, W. R.; RONALD, T. 1995: Crimson seedless: A new late-maturing, red seedless grape. Hortscience 30, 1473-1474.XU H. Y., ZHANG G. J., YAN A. L. 2001: Xiangfei: A new early ripening grape variety. Acta Hortic. Sinica 28, 375. Received July 4, 2011

'Ruiduwuheyi Seedless': A new late-maturing seedless table grape

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'Ruiduwuheyi Seedless': A new late-maturing seedless table grape

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