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2025 Vol.34, Issue 4 Preview Page

Original Articles

Effect of Exogenous Application of Glutamic Acid on Alleviation of Drought Stress in Garlic (Allium sativum L.)

글루탐산 처리가 마늘의 건조 스트레스 경감에 미치는 효과

Jinhyoung Lee1
,
Seunghwan Wi2
,
Taecheol Seo3
,
Seonghoe Jang4
,
Heeju Lee3*
이 진형1
,
위 승환2
,
서 태철3
,
장 성회4
,
이 희주3*
1Post-Doctoral Researcher, Vegetable Research Division, National Institute of Horticultural & Herbal Science, RDA, Wanju 55365, Korea
2Research Officer, Vegetable Research Division, National Institute of Horticultural & Herbal Science, RDA, Wanju 55365, Korea
3Senior Research Officer, Vegetable Research Division, National Institute of Horticultural & Herbal Science, RDA, Wanju 55365, Korea
4Country Director, World Vegetable Center Korea Office (WKO), Wanju 55365, Korea Vegetable Research Division, National Institute of Horticultural & Herbal Science, RDA, Wanju 55365, Korea
1농촌진흥청 국립원예특작과학원 박사후연구원
2농촌진흥청 국립원예특작과학원 농업연구사
3농촌진흥청 국립원예특작과학원 농업연구관
4세계채소센터 한국사무소 소장
*Corresponding Author
31 October 2025. pp. 517-525
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Abstract

This study investigated the effects of foliar application of glutamic acid under drought stress on the growth, photosynthetic performance, and physiological responses of garlic (Allium sativum L.), with the goal of identifying the optimal concentration. After drought stress treatment (no-irrigation), glutamic acid was applied at concentrations of 10, 80, and 169 mg·L-1 twice at 7－day intervals. Treatments increased photosynthetic rate, stomatal conductance, intercellular CO2 concentration, and transpiration compared with the untreated control, with the highest values observed after the first application. On average, the photosynthetic rate increased by 20－40%, with the 80mg·L-1 treatment showing the strongest effect. Activities of antioxidant enzymes (APX, CAT, and SOD) were also highest at 80mg·L-1, exhibiting ≈30% greater activity than the control. Measurements of MDA content and root activity further supported the positive effect of glutamic acid treatment (80mg·L-1) against drought stress. Growth parameters consistently increased, with bulb weight reaching 11.1g in the 80mg·L-1 group compared to 8.5g in the control. Overall, foliar application of glutamic acid enhanced growth, photosynthetic efficiency, and antioxidant defense in garlic under drought stress, with 80 mg·L-1 identified as the optimal concentration.

Keywords
antioxidant enzyme
oxidative stress
photosynthetic rate
root activity
stomatal conductance

본 연구는 건조 스트레스 조건에서 글루탐산의 경엽처리가 마늘의 생장, 광합성 특성 및 생리활성 반응에 미치는 영향과 적정 농도를 구명하고자 하였다. 건조 스트레스 처리 후 글루탐산(Glu; 10, 80, 169mg·L-1)을 각각 7일 간격으로 2회 엽면살포 하였다. 글루탐산 처리 시 마늘의 광합성 속도, 기공전도도, 세포내 CO2 농도 및 증산속도는 무처리 대비 증가하였고, 1회차 처리시 효과가 높았다. 광합성 속도는 무처리 대비 평균 20－40% 이상 증가하였고, Glu80 처리가 가장 높았다. 항산화 효소 활성 분석 결과 1회차 처리시 APX, CAT 및 SOD 활성은 Glu80 처리가 가장 높았고, 무처리 대비 평균 30% 정도 높은 활성을 보였다. MDA 함량과 근활력을 측정한 결과 Glu80 처리가 Glu를 엽면살포 하지 않은 건조 처리와 유의한 차이를 보였다. 마늘의 생육 특성은 전반적으로 증가하는 경향을 보였으며, 구중은 Glu80 처리가 11.1g으로 무처리 8.5g에 비해 가장 무거웠다. 따라서, 건조스트레스 조건에서 글루탐산 경엽 처리는 마늘의 생육, 광합성 특성 및 항산화 효소 활성을 증대시켜 스트레스 피해를 완화하였고, 적정 농도는 80mg·L-1으로 판단된다.

키워드
광합성 속도
근활력
기공전도도
산화스트레스
항산화 효소
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Information
  • Publisher :The Korean Society for Bio-Environment Control
  • Publisher(Ko) :(사)한국생물환경조절학회
  • Journal Title :Journal of Bio-Environment Control
  • Journal Title(Ko) :생물환경조절학회지
  • Volume : 34
  • No :4
  • Pages :517-525
  • Received Date : 2025-10-02
  • Revised Date : 2025-10-23
  • Accepted Date : 2025-10-28
  • DOI :https://doi.org/10.12791/KSBEC.2025.34.4.517
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