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‘Noksu’, a New Late-Summer Season Pear Cultivar with High Fruit Quality and Green Skin
Sam Seok Kang(강삼석),Kwang Sik Cho(조광식),Jang Hoon Song(송장훈),Yoon Kyeong Kim(김윤경),Sang Bouk Jeong(정상복),Dong Su Son(손동수),Hyeon-Mo Cho(조현모),Kyung Hy Hong(홍경희),Myung-Su Kim(김명수),Il-Sheob Shin(신일섭),Yong-Uk S 한국원예학회 2008 한국원예학회 학술발표요지 Vol.2008 No.12
‘녹수’는 배시험장에서 1983년 ‘단배’에 ‘행수’를 교배한 품종으로 1997년에 1차 선발하고, 2005년에 품종으로 명명되었다. 수세는 강하고, 수자는 반직립성이다. 꽃가루가 풍부하고 주요 재배 품종과 친화성이 있으며, 포장에서 흑반병(Alternaria kikuchiana)에 저항성이다. 수확기는 나주에서 ‘행수’보다 5일 늦은 8월 25일이며, 녹색 과피로 새로움을 요구하는 소비자의 구매 요구를 만족시킬 수 있다. 과형은 모본인 ‘단배’를 닮아 편원형이며, 과피 색은 정상적인 수확기에 녹색이지만 완숙기에는 점차 노란색으로 변한다. 과중은 약 529g이고 당도는 11.9°Brix 이다. 육질은 유연하고, 과즙이 많아 식미가 우수하다. 상온 보구력은 약 10일 정도이다. ‘Noksu’ pear cultivar (Pyrus pyrifolia var. culta Nakai) originated from the cross between ‘Danbae’ and ‘Kosui’ in 1983 at Pear Experiment Station of National Horticultural Research Institute, Rural Development Administration, Korea. It was preliminarily selected in 1997 and named in 2005. The tree habit shows vigorous growth and upright spreading. It carries abundant pollen grains and shows cross compatibility with leading cultivars. Also it shows high resistance to black leaf spot (Alternaria kikuchiana) in the field condition. Optimum harvest time is around August 25, which is 5 days later than that of ‘Kosui’ in Naju area, and it could satisfy consumers’ curiosity by its green skin color. The oblate fruit shape resembles maternal parent ‘Danbae’ and skin color is green at normal harvesting time and gradually turns to yellowish green at full ripening state. Fruit weight is about 529 g, and the soluble solids content is 11.9°Brix. The flesh is soft and juicy and renders good eating quality. Shelf life of the fruit is about 10 days at ambient temperature.
강삼석(Sam-Seok Kang),조광식(Kwang-Sik Cho),김윤경(Yoon-Kyeong Kim),정상복(Sang-Bouk Jeong),송장훈(Jang-Hoon Song),이희재(Hee Jae Lee) 한국원예학회 2007 원예과학기술지 Vol.25 No.1
The fruit shape of ‘Geumchonjosaeng’ (Pyrus pyrifolia var. culta Nakai) which was released in 2001 is obovate owing to perpetual calyx naturally existed till harvest time. Thus, this experiment was conducted to determine the effect of calyx removal on shape alteration of ‘Geumchonjosaeng’ pear fruit. The calyx was removed manually at 5, 10, 20, 30, 40, and 60 days after floral abscission (DAFA) respectively. Removing calyx during floral abscission period affected fruit shape. The calyx removal at 5 and 10 DAFA produce round type fruit. The fruit that calyx removed at 20 and 30 DAFA form long-round shape with a projecting part at the fruit apex. The extent of protrusion at calyx end increased as the treatment was delayed. The calyx removal at 45 and 60 DAFA was not effective for improving fruit shape of ‘Geumchonjosaeng’ pear. The calyx removal-treated fruits during floral abscission period were smaller than those of other treatments. Thus, it concluded that the existence of calyx affect the fruit shape and growth at the early stage of fruit development.
생리장해 저항성 배 대목으로 선발된 ‘배연 1호’의 포장 성능 검정
강삼석(Sam-Seok Kang),조광식(Kwang-Sik Cho),손동수(Dong-Su Son),송장훈(Jang-Hoon Song),김윤경(Yoon-Kyeong Kim),정상복(Sang-Bouk Jeong),김정배(Jeong-Bae Kim),김명수(Myung-Su Kim),이상현(Sang-Hyun Lee) 한국원예학회 2008 원예과학기술지 Vol.26 No.3
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.