Field Performance Test of 'Baeyun No. 1' Selected as Resistant Rootstock against Some Physiological Disorders of Pear Fruits

This study was carried out to select a resistant rootstock against some physiological disorders and confirm the field performance test of selected pear (Pyrus pyrifolia) rootstock. 'Chojuro' and 'Whasan' which had shown higher physiological disorder occurrence such as yuzu skin, stony flesh, and cracking were grafted onto 'Baeyeoen No.1', 'Cheongkye', 'Baegkye', and two seedlings of 'Cheongdangrori' and 'Okusankichi'. Tree growth, inorganic nutrient absorption, fruit quality, and some physiological disorder were investigated according to pear rootstocks. Tree growth of scion cultivars affected by rootstock cultivars did not show differences in both 'Chojuro' and 'Whasan' pear after grafting. When 'Baeyoen No.1' was used as a rootstock, yuzu skin in 'Hwasan' and stony flesh in 'Chojoro' occurred 26.7% and 14.3%, respectively. Although there were differences according to rootstocks, phosphate (P), calcium (Ca), and magnesium (Mg) were higher in in both scion cultivars grafted onto 'Baeyoen No. 1' than others those grafted onto other rootstock cultivars excepting potassium. As a result, Ca/K, Ca/Mg, and Mg/K values were also higher in the scion cultivars grafted onto 'Baeyoen No. 1'. Consequently, 'Baeyoen No.1' rootstock reduced the physiological disorder such as yuzu skin and cracking in 'Hwasan' and yuzu skin and stony flesh in 'Chojoro'. Therefore, we recommend 'Baeyoen No.1' as a rootstock against some physiological disorders.