초록
Venturia nashicola에 의한 검은별무늬병 저항성 품종을 육성하기 위하여 저항성 유전자원 탐색을 1997~1999년까지 국립원예특작과학원 포장검정 및 인공 접종을 실시하여 저항 성친으로 서양배 "청마려"을 선발하였다. 농촌진흥청 국립원예특작과학원 과수과에서 고품질 만생종 "만수"에 "청마려"를 1997년에 교배하여 저항성 우량 계통인 중간모본 "원교나-흑성 2호" 을 2008년에 선발하였다. 2008년 만개일은 4월 19일로 "만수" 보다 1일 늦고, "청마려"보다 7일 정도 빠르며 수세는 강하고 수자는 직립형이다. 검은별무늬병에 "청마려"와 "Bartlett"과 같이 강하고 "신고", "원황"등 국내 주요 재배 품종들과 교배 친화성이 있다. 과실은 만개 후 180일경에 성숙되어 양친에 비해 20일 정도 성숙 일수가 짧으며, 과형은 방추, 과피는 황녹갈색이다. 평균과중은 484 g, 당도는 $13.2^{\circ}Brix$이며 과즙량은 중~다이다 석세포가 적고 동양배의 아삭아삭함이 있다.
"Wonkyo Na-heukseong 2" was selected from a cross between "Kiyomaro", late season European cultivar with highly resistance and "Mansoo", late season Asian cultivar with long storability, large size and low susceptibility to pear scab made in 1997 at the National Institute of Horticultural & Herbal Science of Rural Development Administration in Korea. "Kiyomaro", released cross between "Taiheiyo" and "Bartlett" with scab resistance caused by Venturia nashicola in Japan, with no visual symptoms on any leaves was used as scab resistant source after field investigation and artificial inoculation test during 1997~1999. "Wonkyo Na-heukseong 2" blooms 1 day earlier than "Mansoo" and 3 days later than "Kiyomaro" in 2008. It is strong in tree vigor and upright-spreading in tree habit. It is classified as highly resistant to pear scab as "Kiyomaro" and "Bartlett", and cross-compatible with parental variety and Korean major pear varieties such as "Niitaka" and "Wonwhang". The average optimum harvest time of "Wonkyo Na-heukseong 2" was approximately 180 days after full bloom and it matured about 20 days shorter than parental varieties. The fruit is spindle in shape and yellowish greenish brown in skin color. Average fruit weight was 484 g and soluble solids content was $13.2^{\circ}Brix$. The flesh had medium to high juice and negligible grit. Its fruit was crisp like Asian pear.
