Journal of Bio-Environment Control (생물환경조절학회지)

The Korean Society for Bio-Environment Control (한국생물환경조절학회)
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Appropriate Cold Treatment Periods and Shading Levels on Codonopsis lanceolata for Plug Seedling Production in Summer Season

더덕 플러그묘의 하절기 생산을 위한 적정 저온처리 기간과 차광 수준

  • Eun Won Park (Division of Applied Life Science, Graduate School of Gyeongsang National University) ;
  • Jeong Hun Hwang (Division of Applied Life Science, Graduate School of Gyeongsang National University) ;
  • Hee Sung Hwang (Division of Crop Science, Graduate School of Gyeongsang National University) ;
  • Hyeon Woo Jeong (Division of Applied Life Science, Graduate School of Gyeongsang National University) ;
  • So Yeong Hwang (Division of Applied Life Science, Graduate School of Gyeongsang National University) ;
  • Jin Yu (Division of Applied Life Science, Graduate School of Gyeongsang National University) ;
  • Seung Jae Hwang (Department of Agricultural Plant Science, College of Agriculture & Life Sciences, Gyeongsang National University)
  • 박은원 (경상국립대학교 응용생명과학부) ;
  • 황정훈 (경상국립대학교 응용생명과학부) ;
  • 황희성 (경상국립대학교 작물생산과학부) ;
  • 정현우 (경상국립대학교 응용생명과학부) ;
  • 황소영 (경상국립대학교 응용생명과학부) ;
  • 유진 (경상국립대학교 응용생명과학부) ;
  • 황승재 (경상국립대학교 농업생명과학대학 농업식물과학과)
  • Received : 2023.04.06
  • Accepted : 2023.04.24
  • Published : 2023.04.30
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Abstract

Codonopsis lanceolata (S. et Z.) Trautv. is mainly cultivated in Korea and China as a medicinal crop. C. lanceolata is difficult to produce plug seedlings in the summer, because C. lanceolata has a low germination rate and is vulnerable to high temperatures. Cold treatment is effective in breaking dormancy of seeds and increasing the germination rate. Shading cultivation can control the solar irradiance received by plants and reduce the damage by high temperatures and strong light. This study was conducted to examine the appropriate cold treatment period for the improving germination of C. lanceolata, and shading level during the summer seedling period. Cold treatment experiments were conducted for 0 (control), 1, 2, 3, and 4 weeks at 4℃ before sowing. In the shading experiment, C. lanceolata was grown for 45 days with 0 (non-treatment), 45, 75% shading levels. Cold treatment for one week significantly improved the germination energy. The plant height, leaf area, and fresh and dry weights of C. lanceolata seedlings were significantly increased under the 45% shading level. Total root length, root surface area, and the number of root tips were significantly higher in shading treatment (45 and 75%) than in non-treatment. The C. lanceolata seedling's compactness and Dickson's quality index were the highest at 45% shading level. Therefore, these results recommended sowing C. lanceolata after cold treatment for one week at 4℃, and 45% shading level could stably culture C. lanceolata plug seedlings during the high temperature period.

더덕은 한국과 중국에서 주로 재배되는 약용작물로 낮은 발아율과 고온에 취약한 문제점을 지니고 있어 하절기 육묘에 어려움이 있다. 저온처리는 종자의 휴면을 타파하고 발아율을 향상시키는데 효과적이다. 차광재배는 식물체가 받는 태양광을 조절함으로써 고온과 강한 광에 의한 피해를 줄일 수 있다. 본 연구는 더덕의 발아를 위한 적정 저온처리 기간과 육묘기간 중 차광 수준을 조사하기 위해 수행되었다. 저온처리는 4℃에서 0(control), 1, 2, 3, 그리고 4주간 수행되었다. 차광 시험은 더덕을 0(무처리), 45, 그리고 75% 차광 수준에서 45일간 육묘하였다. 일주일간의 저온처리는 더덕의 발아세를 유의하게 향상시켰다. 45% 차광처리에서 더덕 묘의 초장, 엽면적, 그리고 생체중과 건물중은 유의적으로 증가되었다. 총 뿌리 길이, 뿌리의 표면적과 근단 수 등의 지하부 생육은 45%와 75% 차광처리에서 무처리에 비해 향상되었다. 묘소질 지표인 충실도와 DQI는 45% 차광처리에서 가장 우수하였다. 따라서 더덕은 4℃에서 일주일간 저온처리를 거친 후 파종하고, 하절기 육묘 시 45% 차광처리를 통해 안정적인 육묘가 가능할 것이다.

Keywords

Acknowledgement

이 연구는 2020년도 경상국립대학교 연구년제 연구교수 연구지원비에 의하여 수행되었음.

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