'Cheonghyang': A Green Seedless Table Grape

Abstract

'Cheonghyang', a hybrid of 'Red Pearl' (4x) × 'Muscat Bailey A' (2x), is a new green table grape cultivar, which was developed and cultivated by the Gangwon Provincial Agricultural Research and Extension Services, from a cross made in 1999. It is a triploid grape of which the chromosome number is 2n = 3x = 57. The color of the upper surface of young leaves is dark bronze, mature leaves have five blades with a deep upper lateral sinus, and berries have a strong muscat aroma. Average phenological data in the Chuncheon region over the 2006-09 seasons revealed that the bud burst date was 25 April, full bloom occurred on 5 June, and fruit ripened on 25 August. Consequently, it is classified as an early-to mid-season seedless fruit cultivar. The cluster weight was 283.4 g, the soluble solids concentration (SSC) was 17.0°Brix, and the titratable acidity (TA) was 0.45%. This cultivar requires some special management techniques: it is a triploid that has vigorous growth which must be contained, thinning the flower clusters is necessary at the 50% flowering stage, and a single treatment of 100 ppm GA ₃at the flower thinning stage is essential for achieving effective fruit set.