Cold Injury and Temperature-Dependent Hardiness of Citrus spp. under Rain-Shelter Greenhouse Cultivation in Gyeongnam

Jin Hyang Son; Mi Geon Cheon; Sang Woo Choi; Hae In Lee; Hee Sung Jang; Chul Geum Ahn

doi:10.12791/KSBEC.2025.34.4.640

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2025 Vol.34, Issue 4 Preview Page Next Page

Original Articles

Cold Injury and Temperature-Dependent Hardiness of Citrus spp. under Rain-Shelter Greenhouse Cultivation in Gyeongnam 경남지역 비가림 하우스 재배 시 만감류 품종 및 저온에 따른 내동성 비교

31 October 2025. pp. 640-646

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Abstract

The cultivation area of late-maturing citrus (mandarin hybrids) has been expanding into inland regions of Gyeongnam, Korea, due to recent climate warming. To evaluate the feasibility of protected cultivation in rain-shelter houses, this study investigated four-year-old trees of four cultivars-Hallabong(Citrus hybrid ‘Shiranui’), Cheonhyehyang (Citrushybrid ‘Setoka’), Hwanggeumhyang (Citrusreticulata ‘Blanco’), and Redhyang (Citrushybrid ‘Kanpei’)-planted in Jinju. In January 2025, the minimum external temperature dropped to －10.2°C, while the internal temperature fell to －5.2°C; in February, the lowest recorded temperatures were －7.9°C outside and －2.4°C inside. Following these cold events, the extent of leaf injury was evaluated. Among the cultivars, Cheonhyehyang exhibited the highest level of cold damage, whereas Redhyang and Hwanggeumhyang showed relatively lower susceptibility. Artificial low-temperature chamber tests revealed that all cultivars suffered lethal damage at －5°C, whereas cultivar- and age-dependent differences became evident around －3°C. In particular, Cheonhyehyang showed a sharp increase in injury at the threshold temperature. Electrolyte leakage analysis indicated that Hwanggeumhyang and Cheonhyehyang were more vulnerable at the two-year-old stage, although stability generally increased in four-year-old trees. Triphenyl tetrazolium chloride assays demonstrated that Redhyang maintained higher viability across all tested temperatures, whereas Cheonhyehyang exhibited a marked reduction in viability at －3°C. These findings demonstrate clear varietal differences in cold tolerance among late-maturing citrus cultivars. Cheonhyehyang and Hwanggeumhyang were particularly sensitive to low temperatures, suggesting that maintaining a minimum night temperature above 2°C is necessary to ensure stable production in inland rain-shelter cultivation systems.

Keywords

citrus

electrolyte leakage

low temperature

tree age

TTC

지구온난화로 인해 경남 내륙지에 만감류 재배면적이 증가하고 있어, 비가림 하우스에서의 재배 가능성을 평가하기 위하여 본 연구를 수행하였다. 진주지역에 재식된 4년생 ‘한라봉’, ‘천혜향’, ‘황금향’, ‘레드향’ 4품종을 대상으로 2025년 1월에는 1월 10일 외부온도는 －10.2℃, 내부온도는 －5.2℃로 내려갔으며, 2월에는 2월 9일 외부온도 －7.9℃, 내부온도 －2.4℃까지 경과한 후 4년생 잎의 동해 정도를 조사하였다. ‘천혜향’이 가장 높은 피해율을 보였으며 ‘황금향’과 ‘레드향’은 상대적으로 낮았다. 저온 처리 결과 －5℃에서 모든 품종이 치사 수준의 피해를 받았으나, －3℃ 전후에서는 품종별·수령별 차이가 나타났으며 특히 ‘천혜향’은 임계온도에서 급격한 피해 증가를 보였다. 전해질 누출률은 2년생에서 ‘천혜향’과 ‘황금향’이 취약하였으나, 4년생에서는 전반적으로 안정성이 증가하였다. TTC 검정에서는 ‘레드향’이 전 온도에서 높은 활력을 유지하였고, ‘천혜향’은 －3℃에서 급격히 활력이 저하되는 특성을 보였다. 이러한 결과는 품종 간 동해 내성에 뚜렷한 차이가 존재하며, ‘천혜향’과 ‘황금향’은 특히 저온에 민감하여 야간 최저온도를 2℃ 이상으로 유지하는 적극적 관리가 필요한 것으로 판단되었다.

키워드

감귤류

수령

저온

전해질 누출

TTC

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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 :640-646
Received Date : 2025-10-09
Revised Date : 2025-10-30
Accepted Date : 2025-10-31
DOI :https://doi.org/10.12791/KSBEC.2025.34.4.640

Journal of Bio-Environment Control ISSN:1229-4675(Print) 2765-3641(Online) 생물환경조절학회지

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