Horticultural Science & Technology (원예과학기술지)

Korean Society of Horticultural Science (한국원예학회)
권호 표지

Pyruvic Acid and Sugar Contents according to Bulb Growth Stage in Onion

양파의 구 비대 단계에 따른 pyruvic acid와 당 함량

Lee, Eun-Ju;Suh, Jun-Kyu
이은주;서전규

  • Published : 2009.03.31
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Abstract

This study was designed to investigate the pungency response according to the bulb growth stage in onion (Allium cepa). The number of leaves, plant height and bulb scales were significantly increased as the plants grew rapidly after winter. As the bulbs began to enlarge, plant height and the number of leaves were decreased but the weight and diameter of bulbs were significantly increased. The bulbing index (bulb diameter/neck diameter) showed a sharp increase, while the bulb shape index (bulb height/bulb diameter) was reduced. Dry matter rate and crop growth rate (CGR) were increased as bulb enlarged, but remarkably decreased as the bulb enlarged in the harvest time. The pyruvic acid and sugar content in onion bulb were gradually increased as the duration of growth became longer. However, the pyruvic acid content per unit weight of the bulb was temporarily decreased as plant height increased, but increased rapidly again as bulb progressively enlarged. Afterwards it was gradually decreased as bulb got bigger on the account of dilution of chemical constituents in harvest time. The pyruvic acid content per unit weight of the leaf was higher than that of the bulb in the beginning of growth, but it showed a sharp decrease as the bulb enlarged. Sugar content per unit weight of bulb and leaf were increased continuously owing to a translocation of photosynthate, but afterwards it was gradually decreased as bulb got bigger. Also, the content of sugar in a unit size of bulb was higher than that of leaf.

양파의 구비대 단계에 따른 단맛과 매운맛의 발현 양상을 구명하고자 생육기간 경과에 따른 생육 및 pyruvic acid와 당 함량을 분석한 결과, 월동 후 생육이 왕성히 진행되면서 엽수, 초장, 인편수가 유의하게 증가하였고 이 후 구가 비대하기 시작하면서 지상부 생육은 둔화되었으나 구경과 구중은 생육기간이 경과할수록 유의하게 증가하였다. 따라서 구비대지수는 생육기간이 경과할수록 급격히 증가하였으며 구형지수는 감소하였다. 건물함량과 작물생장률(CGR)은 구가 비대 되기 시작하면서 증가하다가 이 후 수확기에 이르러 구가 급격히 비대하면서 감소하였다. 양파 구 전체의 pyruvic acid 함량과 총당 함량은 생육기간이 경과할수록 점진적으로 증가하였다. 양파 구의 단위 무게 당 pyruvic acid 함량은 초장이 길어지면서 일시적으로 감소하였으나 구비대가 시작되면서 다시 큰 폭으로 증가하였고, 이 후 수확기에 이르러 지상부 생장이 둔화되고 구가 급격히 비대하면서 서서히 감소하였다. 그리고 생육 초기에는 구에 비해 엽의 pyruvic acid 함량이 더 많았으나 구비대가 시작되면서 엽내 pyruvic acid 함량이 큰 폭으로 감소하였다. 구의 단위무게 당 총당 함량은 생육 초기에는 지속적으로 증가하다가 이 후 구가 급격히 비대하면서 점점 감소하였다. 엽의 단위 무게 당 총당 함량은 구비대 개시기 이전에는 광합성에 의해 생성된 당이 엽 내 축적되어 있어 큰 폭으로 증가하였으나, 이 후 지상부 생장이 정지되고 구가 급격히 비대하면서 감소하였다.

Keywords

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