Effect of Rootstock on the Tree Growth and Fruit Quality of 'Shiranuhi' Mandarin Hybrid in Plastic Film House

摘要

The tree growth and fruit quality of 'Shiranuhi' [(Citrus unshiu x C. sinensis) x C. reticulata] grafted on five rootstocks were measured in 2004 to 2006 namely, 'Trifoliate orange' (Poncirus trifoliata), 'Swingle citrumelo' (C. paradisi x P. trifoliata), 'Shiikuwasha' (C depressa Hayata), 'Yuzu' (C. junos Sieb.), and 'Shin Amanatsu' (C. natsudaidai) in plastic film house. The trunk diameter, spring shoot length, and the height and width of the tree were significantly higher in 'Swingle citrumelo' and 'Shiikuwasha' than the other rootstocks in 2004 and 2006. The fruit widths were not significantly different in five rootstocks. The fruit height of 'Swingle citrumelo' was the highest compared with other rootstocks. The number of fruits and the yield per tree in 'Swingle citrumelo' were significantly the highest among the rootstocks studied in 2004 and 2006. Soluble solids content and acidity of 'Swingle citrumelo' and 'Shiikuwasha' were significantly lower than those of 'Trifoliate orange'. The concentration of glucose in 'Swingle citrumelo' and 'Shiikuwasha' rootstock was lower than those of other rootstocks, but the concentration of sucrose in 'Swingle citrumelo' increased, which was higher than other rootstocks. In 'Swingle citrumelo', concentration of citric acid was lower and malic acid was higher than 'Trifoliate orange'.