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Screening of Pyrus Species Resistant to Pear Psylla (Cacopsylla pyricola)
Il Sheob Shin,Dong Soon Kim,Seong Sik Hong,Jeong Hee Kim,Kang Hee Cho,Se Hee Kim,Hyun Ran Kim,Dae Hyun Kim,Se Jin Hong,Jeong Hwan Hwang,Hae Sung Hwang 한국국제농업개발학회 2011 韓國國際農業開發學會誌 Vol.23 No.5
꼬마배나무이 (Cacopsylla pyricola)에 저항성 품종육성을 위한 육종재료를 선발코자 월동형 성충수, 단과지내의 산란수, 과총엽내의약충수 및 수관 전체적인 그을음 발생정도를 15개 종 및 종간잡종133개 유전자원을 대상으로 조사하였다. 월동형 성충수는 Pyrus.calleryana 4.6마리, 단과지내 산란수는 P. calleryana 0.3개, 과총엽내약충수는 P. calleryana 0마리, 그리고 그을음 발생정도는 P.betulaefolia, P. calleryana, P. communis, P. hybrid (P.pyrifolia × P.communis), P. lindleyi 0으로 발생 및 피해정도가 가장 낮았으며 종간의 차이가 뚜렷하였다. 전체적으로 대목으로 이용하고 있는 콩배인P. calleryana와 P. betulaefolia가 조사 대상 유전자원 중 가장 높은 항객성(antixenosis)을 보였으나 품질개량에 많은 기간이 요구됨에 따라 실용적으로는 서양배(P. communis) 중 ‘Conference', 'Cascade','Bosc', 'Winter Nelis' 가 가장 낮은 발생 및 피해정도를 보여 꼬마배나무이 저항성 품종 육성을 위한 좋은 육종재료로 판단되었다. Breeding for pear resistance to pear psylla (Cacopsylla pyricola) is one of important objective of the National Institute of Horticultural and Herbal Science breeding program. One hundred thirty three accessions from 15 Asian, Chinese and European pear species were investigated for their resistance against pear psylla. The pear psylla resistance was determined based on the following four characteristics: overwintering adult population, the number of eggs and nymphs, and the degree of soot. The different pear species showed varied resistance to pear psylla. Pyrus calleryana and P. betulaefolia indicated the highest antixenosis as ovipositional preference and antibiosis as nymphal feeding and were the most resistant genetic resources. Likewise the European pears (P. communis), ‘Conference’ and ‘Cascade’, exhibited little occurrence and damage by pear psylla. These were proved to be promising genetic materials for breeding resistant cultivars because they had good fruit quality and showed resistance to pear paylla. The observed population of overwintering adult , the number of eggs and nymphs of psylla had significant correlation each other.
Il Sheob Shin,Hae Sung Hwang,Whee Cheon Kim,Hyun Mo Cho,Daeil Kim,Seong Heo,Yong Uk Shin 한국원예학회 2006 Horticulture, Environment, and Biotechnology Vol.47 No.6
Pear characters such as fruit ripening time, fruit weight, soluble solids, and flesh firmness were analyzed to obtain information on their inheritance using interspecific hybrid seedling populations of 17 crossing combinations between Pyrus pyrifolia and P. ussuriensis or P. bretschneider and their parental cultivars. The average values for the ripening time (calculated as days after full bloom), fruit weight, soluble solids, and flesh firmness in the parental cultivars were 193 days, 416 g, 14.5˚Bx, and 1.41 ㎏/5 ㎜ φ, respectively, and their coefficients of variation were 7.69, 20.22, 10.17, and 14.81%, respectively. The average values of individual crossing combination during 2000-2003 ranged from 159 to 185 days after full bloom, 291 to 447 g in fruit weight, 12.1 to 13.5˚Bx in soluble solids, and 1.06 to 1.89 ㎏/5 ㎜ in flesh firmness, and also the overall average values of the 17 cross combinations for these characters were 174 days after full bloom, 373 g in fruit weight, 12.7˚Bx in soluble solids, and 1.24 kg/5 mm in flesh firmness. The estimates of heritability for days after full bloom, fruit weight, soluble solids, and flesh firmness were in the range of 0.81-0.98, 0.11-0.85, 0.14-0.88, and 0.23-0.98, respectively. The average value of heritability was 0.94 in days after full bloom, 0.46 in fruit weight, 0.48 in soluble solids, and 0.70 in flesh firmness.