biostudies-literatureReglinski TZespri Group Limited833https://www.ebi.ac.uk/biostudies/studies/S-EPMC9962033biostudies-literatureUnknown12(4)The plant defence inducer Actigard^® (acibenzolar-S-methyl [ASM]) is applied before flowering and after fruit harvest to control bacterial canker in kiwifruit caused by <i>Pseudomonas syringae</i> pv. <i>actinidiae</i>. Pre-flowering application of ASM is known to upregulate defence gene expression; however, the effect of postharvest ASM on defence gene expression in the vine is unknown. In this study, the expression of eight "defence marker" genes was measured in the leaves of <i>Actinidia chinensis</i> var. <i>chinensis</i>, "Zesy002," and <i>Actinidia chinensis</i> var. <i>deliciosa,</i> "Hayward," vines after postharvest treatment with ASM and/or copper. There were two orchards per cultivar with harvest dates approximately three weeks apart for investigating potential changesPlants (Basel, Switzerland)Postharvest Application of Acibenzolar-S-Methyl Activates Salicylic Acid Pathway Genes in Kiwifruit Vines.PMC9962033VI19001VI19001 and VI22043VI22043Fehlmann CSchipper MMReglinski THedderley DParry FOldham JMVanneste JLYu JCornish DAfalsePostharvest Application of Acibenzolar-S-Methyl Activates Salicylic Acid Pathway Genes in Kiwifruit Vines.The plant defence inducer Actigard^® (acibenzolar-S-methyl [ASM]) is applied before flowering and after fruit harvest to control bacterial canker in kiwifruit caused by <i>Pseudomonas syringae</i> pv. <i>actinidiae</i>. Pre-flowering application of ASM is known to upregulate defence gene expression; however, the effect of postharvest ASM on defence gene expression in the vine is unknown. In this study, the expression of eight "defence marker" genes was measured in the leaves of <i>Actinidia chinensis</i> var. <i>chinensis</i>, "Zesy002," and <i>Actinidia chinensis</i> var. <i>deliciosa,</i> "Hayward," vines after postharvest treatment with ASM and/or copper. There were two orchards per cultivar with harvest dates approximately three weeks apart for investigating potential changes2023-01-01T00:00:00Z2023 Feb2025-08-17T03:07:47.82Z2025-08-17T03:07:47.82ZS-EPMC99620333684017910.3390/plants12040833