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Analysis of the Growth Responses and Multispectral Reflectance Characteristics of Rehmannia glutinosa Plug Seedlings under Drought Stress

건조 스트레스에 따른 지황 플러그묘의 생육 및 다분광 반사율 특성 분석

Ji Hye Yun1
,
So Yeong Hwang1
,
Jeong Kil Koo1
,
Hyeong Eun Choi1
,
Seong Ha Park1
,
Seung Jae Hwang234*
윤 지혜1
,
황 소영1
,
구 정길1
,
최 형은1
,
박 성하1
,
황 승재234*
1Division of Applied Life Science, Graduate School of Gyeongsang National University, Jinju 52828, Korea
2Division of Horticultural Science, College of Agriculture & Life Sciences, Gyeongsang National University, Jinju 52828, Korea
3Institute of Agriculture & Life Sciences, Gyeongsang National University, Jinju 52828, Korea
4Research Institute of Life Science, Gyeongsang National University, Jinju 52828, Korea
1경상국립대학교 응용생명과학부
2경상국립대학교 농업생명과학대학 원예과학부
3경상국립대학교 농업생명과학연구원
4경상국립대학교 생명과학연구원
*Corresponding Author
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Abstract

Rehmannia glutinosa is a high-value medicinal crop with extreme sensitivity to drought stress. However, non-destructive methods by which to assess the quality of plug seedlings remain limited. This study evaluated the spectral reflectance and vegetation index responses of R. glutinosa plug seedlings to drought stress using multispectral imaging. Drought stress significantly increased the leaf temperature and decreased shoot and root growth parameters compared to the control. NIR (near-infrared) band reflectance declined initially in the early stage of drought stress, with this followed by a significant decrease in visible bands (blue, green, red) as stress intensified. Among the five vegetation indices, the NGRDI (normalized green-red difference index) responded earliest at the early stage of drought stress, while the GNDVI (green normalized difference vegetation index), PSRI (plant senescence reflectance index), and NDRE (normalized difference red edge index) showed significant changes as stress intensified. The NDVI (normalized difference vegetation index) showed a delayed response and was significantly lower in the drought-stressed seedlings than in the control only after rewatering. These results suggest that multispectral imaging is a promising non-destructive tool for early drought stress detection and seedling quality assessments in medicinal plug seedling production systems.

Keywords
early detection
medicinal crop
non-destructive assessment
phenotyping
water deficit

지황(Rehmannia glutinosa)은 경제적 가치가 높은 약용작물로 건조 스트레스에 민감하나, 플러그묘 소질의 비파괴적 진단 방법은 현재까지 제한적이다. 본 연구는 다분광 영상을 활용하여 지황 플러그묘의 건조 스트레스에 따른 분광 반사율 및 식생지수 반응을 구명하고자 하였다. 건조 스트레스 처리에 의해 대조구 대비 엽온은 유의적으로 상승하였으며, 지상부 및 지하부 생육 지표는 유의적으로 감소하였다. 건조 스트레스 초기에는 근적외선 밴드(NIR) 반사율이 먼저 감소하였으며, 스트레스가 심화됨에 따라 가시광 밴드(Blue, Green, Red) 반사율의 유의적 감소가 후속적으로 나타났다. 5개 식생지수 중 NGRDI(Normalized Green-Red Difference Index)는 건조 스트레스 초기에 가장 빠르게 반응하였으며, GNDVI(Green Normalized Difference Vegetation Index), PSRI(Plant Senescence Reflectance Index), NDRE(Normalized Difference Red Edge Index)는 스트레스 심화에 따라 유의적인 변화를 나타냈다. NDVI(Normalized Difference Vegetation Index)는 반응이 지연되어 회복관수 후 건조 스트레스 처리구에서 대조구보다 유의하게 낮았다. 이상의 결과는 다분광 영상이 공정육묘 생산 시스템에서 건조 스트레스 조기 탐지 및 묘소질 평가를 위한 유망한 비파괴적 도구로 활용될 수 있음을 시사한다.

키워드
조기 탐지
약용 작물
비파괴 평가
표현형 분석
수분 결핍
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Information
  • Publisher :KOREAN SOCIETY FOR HORTICULTURAL SCIENCE
  • Publisher(Ko) :한국원예학회
  • Journal Title :Horticultural Science and Technology
  • Journal Title(Ko) :원예과학기술지
  • Received Date : 2026-06-01
  • Revised Date : 2026-07-31
  • Accepted Date : 2026-09-02
  • DOI :https://doi.org/10.7235/HORT.20260033
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