KOREAN JOURNAL OF CROP SCIENCE (한국작물학회지)

The Korean Society of Crop Science (한국작물학회)
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Changes in the Physicochemical Characteristics of Sweet Corn Kernels during Grain Filling Stage with Different Sowing Date

단옥수수 주요 품종의 등숙 중 종실 이화학적 특성 변화

  • 김미정 (농촌진흥청 국립식량과학원) ;
  • 박효진 (농촌진흥청 국립식량과학원) ;
  • 김선림 (농촌진흥청 국립식량과학원) ;
  • 정건호 (농촌진흥청 국립식량과학원) ;
  • 김정태 (농촌진흥청 국립식량과학원) ;
  • 신성휴 (농촌진흥청 국립식량과학원) ;
  • 권영업 (농촌진흥청 국립식량과학원) ;
  • 정일민 (건국대학교 생명환경과학대학 응용생물과학과)
  • Received : 2014.08.25
  • Accepted : 2014.10.09
  • Published : 2014.12.31
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Abstract

This study was conducted to investigate the kernel characteristics of sweet corn during ripening with different sowing date. Godangok and Guseulok were sown at April 10, July 10, July 20, and July 30 in 2013. Irrespective of sowing date, fresh and dry weight of 100 kernel, starch content, crude fat content, and hardness of sweet corn kernels were significantly increased according to maturation (p<0.05). But moisture content, total sugar content, crude protein content and crude ash content of sweet corn kernels were significantly decreased according to maturation (p<0.05). The changing rates of 100 kernel weight and starch content on kernels were faster at early sowing date than at late sowing date. The moisture content of sweet corn kernels was 68~69% at optimum for harvesting. The degree of sweetness on Godangok was about 1.8 and 1.4 times higher in sowing at July 20 and July 30 than in sowing at April 10. On the other hand, the degree of sweetness was similar regardless of sowing time on Guseulok. These results will be helpful to farmers for fall-harvest sweet corn cultivation and management.

본 연구에서는 단옥수수 주요 품종인 고당옥과 구슬옥을 재배하여 고품질 단옥수수 생산 재배법을 보급하기 위한 기초자료를 제공하고자 종실의 등숙 중 이화학적 특성 변화를 조사하였다. 파종시기와 관계없이 등숙이 진행됨에 따라 수분 함량은 감소하고, 종실 100립의 생중과 건중은 증가하였고(p<0.05), 파종시기가 늦어질수록 100립중의 증가 속도는 느려졌다. 종실의 조단백과 조회분 함량은 출사 후 일수가 경과함에 따라 감소하는 경향을 보였고, 조지방 함량은 유의하게 증가하였다(p<0.05). 단옥수수 종실의 총 유리당 함량은 파종시기와 관계없이 출사 후 일수가 경과함에 따라 유의하게 감소하였으나(p<0.05), 유리당을 구성하는 fructose, glucose, sucrose와 maltose의 조성은 파종시기에 따라 차이를 보였으며 그 중 sucrose가 대부분을 차지하고 있었다. 종실의 전분 함량과 경도는 출사 후 일수가 경과함에 따라 유의하게 증가하는 경향을 보였으며(p<0.05), 전분 함량의 증가 속도 역시 100립중과 마찬가지로 파종이 늦어질수록 느려지는 경향을 보였다. 수확 적기의 종실 수분함량은 68~69% 정도였으며, 전분 함량은 7월 10일 파종이 가장 높았고 7월 30일 파종이 가장 낮았다. 적기에 수확한 단옥수수의 단맛을 비교한 결과 고당옥은 4월 10일 파종한 것에 비해 7월 20일, 7월 30일 파종이 약 1.8배와 1.4배 단맛이 높은 반면 구슬옥은 파종시기와 상관없이 단맛의 정도가 비슷하였다.

Keywords

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