earticle

영어

Citrus canker, caused by the bacterial pathogen Xanthomonas citri subsp. citri (Xcc), is one of the most severe diseases and a significant threat to all citrus growing regions. Citrus canker can induce severe defoliation on susceptible cultivars, drastically decrease crop yields by causing premature fruit drop, and can decrease fruit marketability. To evaluate whether citrus varieties developed in Citrus Research Institute in jeju Island are resistant or susceptible to citrus canker disease, the leaves were inoculated with bacterial suspension and then the characteristics symptoms were observed. The potted trees of 'Haryejosaeng', 'Joeunyegam', 'Noeulhyang', 'Miraehyang', 'Winterprince' and 'Tambit 1ho' used in this study, were pruned to stimulate production of uniform flushes of new leaves and maintained at 25℃ in growth room. When leaves were three-fourth of mature size, the new leaves of them were sprayed with bacterial suspensions of Xcc (OD=0.1, 108 CFU/mL) grown for 3 days on Yeast Nutrient Agar (YNA) medium. In result, at 15 days after inoculation, typical symptoms (circular lesions with yellow pustules) were observed in these varieties. In characteristics symptoms of these varieties, it was confirmed that the lesions were evenly spread across the front and back of a leaf in 'Joeunyegam', 'Noeulhyang', 'Miraehyang', 'Winterprince' and 'Tambit 1 ho' but only partially or the edge in 'Haryejosaeng'. In conclusion, we classified 'Haryejosaeng' as resistant to cirus canker disease, and 'Joeunyegam', 'Noeulhyang', 'Miraehyang', 'Winterprince' and 'Tambit 1ho' as susceptible.

한국어

감귤은 Xanthomonas citri subsp. citri (Xcc)에 의한 세균성 식물병으로 감귤산업에 심각한 피해를 끼친다. 궤양병은 감귤 모든 부위에 나타나며 병징이 심해지면 잎이 떨어 지며 수량이 감소하고 과실의 상품성이 떨어 진다. 궤양병 저항성 형질을 갖춘 감귤 품종 이 노지에서 안정적인 상품과 생산이 가능하 다. 궤양병에 취약한 품종은 노지에서 상품과 생산이 어렵기 때문에 시설에서 재배해야 안 정적으로 상품과를 생산할 수 있다. 감귤연구 소에서 육성한 '하례조생', '조은예감', ' 노을향', '미래향', '윈터프린스', '탐빛1 호'의 궤양병 저항성을 평가하였고, 시험 결과 '하례조생'은 궤양병 저항성, '조은 예감', '노을향', '미래향', '윈터프린스 ', '탐빛1호'는 감수성으로 분류하였다.