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강삼석(Sam-Seok Kang),김윤경(Yoon-Kyeong Kim),조광식(Kwang-Sik Cho),정상복(Sang-Bouk Jeong),황해성(Hea Seong Hwang),김명수(Myung-Su Kim),신일섭(Il-Sheob Shin),신용억(Yong-Uk Shin),원경호(Kyeong-Ho Won),최장전(Jang-Jeon Choi) 한국원예학회 2011 원예과학기술지 Vol.29 No.6
Pear cultivar Supergold (Pyrus pyrifolia var. culta Nakai) was originated from the cross between Chuwhangbae and Manpungbae with the aims of improving the fruit quality of Chuwhangbae cultivar at Pear Research Station of National Institute of Horticultural & Herbal Science, Rural Development Administration in 1994. Supergold was preliminarily selected in 2002 and named in 2008. The tree shows a vigorous growth habit and semi-spread characters like as Manpungbae. Furthermore, it has sufficient flowers and carries abundant pollen grains, so it can also be used as a pollinator. Supergold is highly resistant to black leaf spot (Alternaria kikuchiana) in the field condition. The optimum harvest time is around Sep. 11th, which is ahead of Whangkeumbae about 5 days in the harvest period. The fruit shape is oblate and fruit skin color is greenish-white at harvesting time. The average weight of fruit is 570 g, and the soluble solids content is 13.6 °Brix. The flesh is very soft and juicy, and renders good eating quality. Shelf life is about 6 months under the cold storage condition. To determine the self-incompatibility (SI) genotype of Supergold pear cultivar, it was crossed with other cultivars of which SI genotypes have already known. The result of cross-pollinations of Supergold with other cultivars showed relatively high rates of fruit set from 64.5% to 91.0%, except for the cross with pollens of Nijisseiki that represented only 28.8% of fruiting rate. Although sometimes the stigma of Supergold crossed with Hayatama, Chojuro, and Nijisseiki showed malformed pollen tube tips, Supergold is generally supposed to have cross-compatibility with all other pollen donor cultivars. It is considered that the S-allele of Supergold is S<SUB>3</SUB>S<SUB>4</SUB>, which is based on the result of PCR-RFLP.
화학 약제가 배 화분 발아와 화분관 신장에 미치는 영향
강삼석(Sam-Seok Kang),김윤경(Yoon-Kyeong Kim),정상복(Sang-Bouk Jeong),조광식(Kwang-Sik Cho),최장전(Jang-Jeon Choi),한점화(Jeam-Wha Han),이희재(Hee Jae Lee) 한국원예학회 2010 원예과학기술지 Vol.28 No.2
Pear pollen germination and pollen tube elongation in artificial medium were evaluated following the application of ten pesticides which are generally used at flowering period. Pollen germination was not significantly affected by abamectin, fenarimol, and myclobutanil sprayed on the medium immediately after pollen sowing. On the other hand, kresoxim-methyl and mancozeb were most inhibitory. Intermediate inhibitory effects on pollen germination were also observed in the sprays of azoxystrobin + difenoconazole, difenoconazole, dithianon, and imidacloprid. Pollen tube elongation was not affected by myclobutanil spray in ‘Wonwhang’ and ‘Chuwhangbae’ pear cultivars.Intermediate inhibitory effects were observed in the sprays of azoxystrobin + difenoconazole, difenoconazole, and mancozeb. Dithianon and kresoxim-methyl were most inhibitory in pollen tube elongation. As the result of cluster analysis, pollen germination and pollen tube elongation type of the pear cultivars could be divided into five groups by three pesticides.
강삼석(Sam-Seok Kang),김윤경(Yoon-Kyeong Kim),최장전(Jang-Jeon Choi),조광식(Kwang-Sik Cho),원경호(Kyeong-Ho Won),이한찬(Han Chan Lee),유덕준(Duk Jun Yu),이희재(Hee Jae Lee) 한국원예학회 2013 원예과학기술지 Vol.31 No.6
During pear fruit development, calyx can abscise from fruitlet following petal fall. The calyx abscission varies with pear cultivars. The presence of calyx on pear fruit makes the fruit shape calyx end protruded. In the present study, the degrees of the calyx abscission were examined in 120 Southern-type Asian pear (Pyrus pyrifolia), 52 Nothern-type Asian pear (P. ussuriensis), and 34 European pear (P. communis) cultivars, and its inheritance was investigated using cross combinations between the Southern-type Asian pear cultivars showing different degrees of calyx abscission. Majority of the cultivars produced < 10% or > 90% calyx-perpetual fruit, but the cultivars producing both calyx-perpetual and -deciduous fruit were in minor frequency. The cultivars producing < 10% calyx-perpetual fruit were in higher frequency in Southern-type Asian, Nothern-type Asian, and European pears in that order, while those producing calyx-perpetual fruit were in higher frequency in European, Nothern-type Asian, and Southern-type Asian pears in that order. In the cross between the parents producing < 10% calyx-perpetual fruit, most of the F1 seedlings also produced < 10% calyx-perpetual fruit. In the cross between the parents producing > 90% calyx-perpetual fruit, on the contrary, most of the F1 seedlings also produced > 90% calyx-perpetual fruit. When the paternal parent produced < 10% calyx-perpetual fruit, most of the F1 seedlings also produced < 10% calyx-perpetual fruit regardless of the degree of calyx abscission in the maternal parent. When the cross was between the maternal parent producing < 10% calyx-perpetual fruit and the paternal parent showing different degrees of calyx abscission, the F1 seedlings showed similar degrees of the calyx abscission to those in the paternal parent. These results suggest that the characteristics of the calyx abscission is influenced more greatly by the paternal parent than by the maternal parent, and the calyx abscission in Southern-type Asian pears is a qualitative trait which is governed by dominant gene(s).
강삼석(Sam-Seok Kang),조광식(Kwang-Sik Cho),송장훈(Jang-Hoon Song),김윤경(Yoon-Kyeong Kim),정상복(Sang-Bouk Jeong),손동수(Dong-Soo Son),조현모(Hyeon-Mo Cho),홍경희(Kyung-Hui Hong),김명수(Myung-Su Kim),신일섭(Il-Sheob Shin),신용억(Yon 한국원예학회 2009 원예과학기술지 Vol.27 No.1
‘Manhwang’ pear cultivar (Pyrus pyrifolia var. culta Nakai) originated from the cross between ‘Okusankichi’ and ‘Chuwhangbae’ to improve the fruit quality of ‘Chuwhangbae’ cultivar in 1986 at Pear Experiment Station of National Horticultural Research Institute (NHRI), Rural Development Administration (RDA). ‘Manhwang’ was preliminarily selected in 1999 and named in 2006. The tree habit shows vigorous growth and upright. It abounds with a flower cluster and carries abundant pollen grains, so it can be used as a pollinizer. ‘Manhwang’ is highly resistant to black leaf spot (Alternaria kikuchiana) in the field condition. The optimum harvest time is around Oct. 26th, which is 6 days later than that of ‘Chuwhangbae’, and it’ll be used for the long-term storage cultivar. The fruit shape is round and fruit skin color is yellowish brown with bloom at harvesting time. The average of fruit weight is 563 g, and the content of soluble solid is 14.0°Bx. The flesh is very soft and juicy, and rendering good eating quality. Shelf life is about 9 months under the cold storage condition.