Enhancing agrochemical delivery in citrus leaves with geraniol: a promising strategy for controlling huanglongbing (HLB)
文献类型： 外文期刊
作者： Chen, Shuning 1 ; Yuan, Ao 1 ; Wang, Huafeng 1 ; Yang, Daibin 1 ; Cui, Li 1 ; Hao, Fengjiao 1 ; Yan, Xiaojing 1 ; Yuan, Huizhu 1 ;
作者机构： 1.Chinese Acad Agr Sci, Inst Plant Protect, China & Key Lab Integrated Pest Management Crops, Minist Agr, Beijing 100193, Peoples R China
关键词： citrus huanglongbing; chemical permeation; essential oils; adjuvants; fungicides; antimicrobials
期刊名称：PEST MANAGEMENT SCIENCE （ 影响因子：3.8； 五年影响因子：4.3 ）
ISSN： 1526-498X
年卷期： 2025 年 81 卷 3 期
页码：
收录情况： SCI
摘要： BACKGROUNDCitrus huanglongbing (HLB) is a devastating disease in citrus, caused by Candidatus Liberibacter asiaticus (CLas), which primarily resides in the phloem where chemicals cannot effectively reach, posing a significant challenge in controlling HLB. To address these challenges, plant essential oils (EOs), widely used as transdermal enhancers and known for their benefits for plant tissues, were investigated for their potential to enhance chemical permeation.RESULTSIn this study, seven EOs - eugenol, carvacrol, eucalyptol, geraniol, linalool, cinnamaldehyde, and d-limonene - were evaluated for their potential to enhance chemical penetration into citrus leaves. Preliminary screening with tracer methods revealed that geraniol provided the greatest enhancement of permeation, achieving the deepest and broadest distribution into the spongy tissue of the citrus leaf. The permeation levels of rhodamine B and crystal violet through the cuticular layer were elevated from 0.55 mg L-1 and 0.11 mg L-1 to 20.04 mg L-1 and 7.14 mg L-1, respectively, by the addition of geraniol. Further validation through high-performance liquid chromatography-mass spectrometry (HPLC-MS) confirmed that the penetration of fludioxonil and tetracycline into citrus leaf tissues was enhanced by 15.07-fold and 20.43-fold, respectively. In planta experiments confirmed that adding geraniol to tetracycline and oxytetracycline via foliar application eliminated CLas bacteria in HLB-affected citrus more efficiently than controls.CONCLUSIONOur study underscores the potential of geraniol as an effective EO-based permeation enhancer for combating HLB. By significantly improving the delivery and efficacy of bactericidal treatments, geraniol offers a promising strategy for managing this catastrophic citrus disease, potentially transforming the approach to controlling HLB. (c) 2024 Society of Chemical Industry.
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