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강삼석(Sam-Seok Kang),김윤경(Yoon-Kyeong Kim),황해성(Hea Seong Hwang),조광식(Kwang-Sik Cho),신일섭(Il-Sheob Shin),원경호(Kyeong-Ho Won),최장전(Jang-Jeon Choi),김기홍(Ki-Hong Kim),조지형(Ji Hyeong Jo) 한국원예학회 2013 원예과학기술지 Vol.31 No.4
Pear cultivar ‘Sinhwa’ (Pyrus pyrifolia var. culta Nakai) was originated from a cross between ‘Niitaka’ and ‘Whasan’ with the aims of improving the fruit quality and the traits of cultivation and of early maturing more than ‘Whasan’ cultivar at Pear Research Station of National Institute of Horticultural & Herbal Science, Rural Development Administration in 1995. ‘Sinhwa’ was preliminarily selected in 2004 and named in 2009. The tree shows vigorous growth habit and semi-spread characters like ‘Niitaka’. Furthermore, it has a sufficient and well upkeep of the flower bud, so it can be more easily cultivated in orchards. In the flower characteristics, flowering time of ‘Sinhwa’ is 11<SUP>th</SUP> April like as maternal parent ‘Niitaka’. Also ‘Sinhwa’ has short of pollen grains, so it is need above two pollinizer cultivars. ‘Sinhwa’ is highly resistant to black leaf spot (Alternaria kikuchiana) and relatively strong to pear scab (Venturia nashicola) in field condition. The optimum harvest time is around Sep. 15<SUP>th</SUP> in Naju, which is ahead of ‘Whasan’ about 10 days in the harvest period. The fruit shape is oblate and fruit skin color is yellowish-brown during harvesting time. The average weight of fruit is 627 g, and the soluble solids content is 13.0°Brix. The flesh is very soft and juicy, and renders good eating quality. Shelf life is about 30 days under the room temperature condition.
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.