본 연구는 치콘 생산에 적합한 치커리 뿌리 외적(근경, 근중), 내적(이눌린, 당)특성을 구명하여 상품성 있는 치콘을 생산할 수 있는 치커리 뿌리의 지표특성을 개발하고자 하였다. 치커리 뿌리의 외적지표인 근경과 근중이 치콘의 생체중에 미치는 영향을 알기 위해 근경(0.726)과 근중(0.508)의 상관관계를 분석한 결과 모두 생체중과 정(+)의 상관관계를 보였다. 치콘 생체중에 영향을 주는 종근의 외적요인인 근경과 근중 중 상대적으로 높은 영향인자를 찾기 위하여 다중회귀 분석을 실시한 결과 치커리 근경의 회귀계수(6.06***)만이 유의하여 치콘 생체중에 높은 영향을 미치는 것으로 나타났다. 이러한 관계를 검증하기 위하여 치커리 근경(x) 크기별로 x≤30㎜, 30<x≤40㎜, 40<x≤50㎜, x>50㎜ 등 4처리로 치콘을 생산한 결과 거의 모든 처리구에서 근경이 증가할수록 치콘 생체중, 치콘 폭, 엽수 등이 증가하였다. 이상의 결과로 보아 치커리 종근의 탄수화물 함량 등 내부요인을 분석하지 않고, 상대적으로 간편한 외적요인인 치커리 근경을 수확 후 측정하여 치콘의 생체중을 미리 판단할 수 있을 것으로 사료되었다. 치커리 뿌리의 내적지표를 구명하기 위해 ?2℃에 저장 중인 뿌리를 2℃로 옮겨 1주, 2주, 3주 및 4주간 저온처리를 하여 inulin과 당 함량을 분석해 본 결과, 처리기간이 경과됨에 따라 inulin 함량이 감소하였고, 품종별로 다른 양상을 보였다. 유리당 함량은 sucrose>fructose>glucose 순으로 높았고, ‘Focus’ 품종이 ‘Vintor’ 품종보다 sucrose의 함량이 높게 나타났다. 또한 fructose의 함량이 ‘Vintor’ 품종에서는 2주 저온처리에서 가장 높게 나타난 뒤 점차 감소한 반면, ‘Focus’ 품종에서는 저온처리 기간이 경과함에 따라 점차 감소하는 경향이 나타났다. 저온처리 기간별 치콘의 상품율을 비교한 결과 ‘Vintor’ 품종이 2주간 저온처리 시 74.2%로 가장 높게 나타났고, ‘Focus’ 품종은 저온처리 기간에 상관없이 모든 처리구에서 55%이하로 낮게 나타났다. 치커리 뿌리의 내적 소질인 당과 치콘 상품율을 비교해본 결과, ‘Vintor’ 품종은 저장 2주까지 뿌리 당 함량과 치콘 상품율 모두 증가하였고, 2주 이후에는 당함량과 상품율 모두 다소 감소하였다. ‘Focus’ 품종은 저장처리 후 함께 감소하는 경향을 보였다. 이로서 당 함량이 치콘의 상품율에 영향을 미친다고 판단할 수 있었다.
1. Effect of External Factors of Chicory(Cichorium intybus L.) Root on Chicon Quality This study was conducted to investigate correlation between external factors of chicory root and chicon fresh weight, whereby, to provide basic information of external yardstick of producing standardized chicon. For correlation between external factors(root diameter, root weight) of chicory root and chicon fresh weight were highly correlated. The relationship between external factors(root diameter, root weight) of chicory root and chicon fresh weight, root diameter was strongly affecting chicon fresh weight due to significant at its regression coefficient(6.06***). In order to verify this correlation, the root diameter(x) of chicory that were 3 different varieties were based on the 4 different root diameter treatments, such as x≤30㎜, 30<x≤40㎜, 40<x≤50㎜ and x>50㎜. The chicon production increased as root diameter increased and the chicon fresh weight, chicon width, and the number of leaves increased as well. Therefore, the measure of root diameter of chicory instead of the internal factors(carbohydrate, and so on.) can be used to predict the chicon fresh weight.
2. Effect of Internal Factors of Chicory(Cichorium intybus L.) Root on Chicon Quality This study was conducted to investigate correlation between internal factors of chicory root and chicon quality. The low-temperature processing temperature of root was treated with 2°C. And the low-temperature processing periods were treated with 0, 1, 2, 3 and 4 weeks each. After treatment, roots were analysed inulin and sugar contents. Along with the passage of low-temperature processing period in 2°C the inulin content decreased. Free sugar content, sucrose> fructose> glucose was higher in the order. And the sucrose content of ''Focus'' more higher than ''Vintor''. The fructose content when low-temperature processing during 2 weeks was the highest. ''Focus'' tend to was gradually reduced to along with the passage of low-temperature processing period. After low-temperature processing treatment, chicon was produced in the forcing stage(at 15 to 17°C and 98 to 100% relative humidity in dark condition) during 20 days. The chicon marketability of ''Vintor'' when low-temperature processing during 2 weeks was the highest at 74.2%. In contrast, ''Focus'' was low less than 55% in all treatments. In addition total soluble solid contents of roots showed the same trend. The total soluble solid contents of roots of ‘Vintor’ when low-temperature processing during 2 weeks was the highest at 22.08 Brix. In contrast, ''Focus'' was gradually reduced to along with the passage of low-temperature processing period. Therefore, the measure of the total soluble solid contents of chicory roots can be used to predict the chicon quality.
I. 서 론 ················································1II. 연 구 사 ················································3III. 재료 및 방법·············································71. 외적특성 영향 연구····································7(1) 뿌리 외적특성과 치콘 생체중간 관계분석··········7(2) 근경에 따른 치콘 품질 비교·······················82. 내적특성 영향 연구····································9(1) 저온처리 기간별 뿌리 내적특성(이눌린, 당)분석···9(2) 저온처리 기간별 치콘 픔질 비교···················10IV. 결과 및 고찰 ············································121. 외적특성 영향 연구····································12(1) 뿌리 외적특성과 치콘 생체중간 관계분석··········12(2) 근경에 따른 치콘 품질 비교·······················172. 내적특성 영향 연구····································20(1) 저온처리 기간별 뿌리 내적특성(이눌린, 당)분석···20(2) 저온처리 기간별 치콘 픔질 비교···················31Ⅴ. 적 요 ····················································41