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A New Hairless Baby Kiwifruit ‘Bangwoori’
Yong-Bum Kwack(곽용범),Pong-Nyul Paek(백봉렬),Kyeong-Ho Chung(정경호),Jeong-Hwan Hwang(황정환) 한국원예학회 2008 한국원예학회 학술발표요지 Vol.2008 No.12
비타민 C가 풍부한 참다래는 세계적으로 ‘헤이워드’라는 단일 품종이 거의 대부분 재배되고 있어 재배 농가와 소비자의 선택의 폭이 매우 좁다. 농촌진흥청 남해출장소에서는 기존의 우점 품종인 ‘헤이워드’를 대체하고 다양한 새로운 형질을 지닌 시장성이 있는 품종을 육성하기 위해 1984년부터 육종 프로그램을 운영해 오고 있다. 1989년 국내에서 수집된 자생 다래에 ‘토무리’를 교배하여 나온 실생 중에 특성이 우수한 계통을 2000년에 1차 선발하였으며, 2001~2005년까지 특성 검정을 통해 2006년에 최종 선발하였다. 과육은 녹색이며, 과실의 껍질에는 털이 없다. 과중은 평균 21g 정도이며, 평균 당도는 14.5°Brix이다. 수확기는 10월 상?중순이며, 과피 색은 과실 생장 초기에는 녹색이나 수확기에 이르러 녹색바탕에 부분적으로 갈색을 띤다. 생육 후반기에 그늘짐에 의한 낙엽이 발생할 수 있으므로 수관 하부가 지나치게 그늘지지 않도록 유의해야 한다. Commercial planting of kiwifruit in Korea is mainly done with ‘Hayward’. Consumers and producers’ choice of cultivars and the enjoyment of this attractive fruit with abundant vitamin C are very limited. We have had breeding programs to improve the dominant cultivar, ‘Hayward’, and to diversify marketable cultivars having such characters as novel flesh color, hairlessness, etc. since 1984. ‘Bangwoori’ was born as a cross of mother plant Actinidia arguta collected from Korean mountains and the pollinizer A. deliciosa ‘Tomuri’. It has a mouthful fruit size without skin hair. It was selected firstly in 2000 and finally released in 2006 after evaluation of characteristics for more than 3 years. It has green flesh color, no hair on fruit skin, 21 g of average fruit weight, 14.5°Brix of soluble solids content and picking is usually done in early to mid October. It has green skin in early time of fruit enlargement, and scab-like brown spot or stripe appears partially in late fruit development. Shading of canopy might cause early defoliation.
‘Redvita’ : A Yellow-fleshed Kiwifruit with Red Color Around the Core
Yong-Bum Kwack,Hong-Lim Kim,Jae-Han Lee,Kyeong-Ho Chung,Won Byoung Chae 한국원예학회 2017 원예과학기술지 Vol.35 No.3
Kiwifruits introduced to Korea typically have green fruit flesh, yellow flesh, or yellow flesh with red coloration around the core. Here, we describe a new cultivar called ‘Redvita’, the first kiwifruit cultivar of Korea with yellow flesh and red coloration around the core. A conventional field cross was conducted in 2003, and permission for the final release of ‘Redvita’ was obtained in 2012. ‘Redvita’ originates from ‘Red Princess’, a maternal vine known for the red coloration in its flesh. The pollinizer is ‘NHK0013’ (IT233175), which blooms in early May. A principal feature of ‘Redvita’ is its high vitamin C content, which at an average of 140 ㎎ per 100 g of fresh weight is 2 - 4 times higher than other commercial cultivars. The average fruit weight is 97 g; bigger than that of the control cultivar ‘Hongyang’. ‘Redvita’ blooms in mid-May and is usually harvested in early to mid-October, approximately 150 - 160 days after anthesis. ‘Redvita’ produces 3 or 4 flowers per fruiting shoot, with no small lateral flowers, therefore does not need to be thinned before blooming for commercial production. The cultivar is acidulous because of a high titratable acidity content (about 1.5%), which is higher than other cultivars (less than 1.0%). ‘Redvita’ was registered with the Korean Seed and Variety Service in 2015 for plant variety protection rights (no. 5604).
Yong-Bum Kwack,Hong Lim Kim,Youn-Sig Kwak,Yong Bok Lee 한국토양비료학회 2018 한국토양비료학회지 Vol.51 No.1
Yuzu (Citrus junos) gummosis disease, caused by Phytophthora nicotianae, was first reported in 1997. As known in citrus, Phytophthora is the most fastidious soil-borne pathogen to control. In order to minimize its damage to Citrus spp., integrated pest management (IPM) approach, including fungicide chemicals and resistant cultivars, is necessary. Therefore, in this study we tried to evaluate tolerance of yuzu cultivars and its related species against yuzu Phytophthora. Trifoliate orange was evaluated as a susceptible host to yuzu Phytophthora by both mycelial growth onto extract media and immature fruit inoculation. However, in zoospores spray-inoculation on 2-year-old cuttings tree, trifoliate orange appeared to have a resistant property as showing less than 6% diseased leaf rate. Among yuzu cultivars only ‘Namhae No. 1’ appeared resistant property against both P. nicotianae and P. citrophthora. The ‘Namhae No. 1’ showed 5.7% and 10.6% diseased leaf ratio by P. nicotianae and P. citrophthora, respectively. Clearly, in order to reduce damages caused by two yuzu Phytophthora, we suggest that growers may utilize a trifoliate orange as a rootstock and ‘Namhae No. 1’ as a scion for fruit production.
Kwack, Yong-Bum,Kim, Hong Lim,Kwak, Youn-Sig,Lee, Yong Bok Korean Society of Soil Science and Fertilizer 2018 한국토양비료학회지 Vol.51 No.1
Yuzu (Citrus junos) gummosis disease, caused by Phytophthora nicotianae, was first reported in 1997. As known in citrus, Phytophthora is the most fastidious soil-borne pathogen to control. In order to minimize its damage to Citrus spp., integrated pest management (IPM) approach, including fungicide chemicals and resistant cultivars, is necessary. Therefore, in this study we tried to evaluate tolerance of yuzu cultivars and its related species against yuzu Phytophthora. Trifoliate orange was evaluated as a susceptible host to yuzu Phytophthora by both mycelial growth onto extract media and immature fruit inoculation. However, in zoospores spray-inoculation on 2-year-old cuttings tree, trifoliate orange appeared to have a resistant property as showing less than 6% diseased leaf rate. Among yuzu cultivars only 'Namhae No. 1' appeared resistant property against both P. nicotianae and P. citrophthora. The 'Namhae No. 1' showed 5.7% and 10.6% diseased leaf ratio by P. nicotianae and P. citrophthora, respectively. Clearly, in order to reduce damages caused by two yuzu Phytophthora, we suggest that growers may utilize a trifoliate orange as a rootstock and 'Namhae No. 1' as a scion for fruit production.