Phosphite-Induced Defense Mechanisms in Crop Disease Management

Phosphite (Phi), a reduced form of phosphorous closely related to orthophosphate, has emerged as a versatile tool in crop protection through both direct pathogen suppression and the stimulation of plant immune responses. Upon foliar or soil application, phosphite can exert local toxicity against oomycetes and certain fungal pathogens, while at the same time serving as a priming agent that readies defence pathways for faster and stronger activation upon pathogen encounter. At the cellular level, phosphite treatment often triggers an oxidative burst characterised by the controlled production of reactive oxygen species, coupled with up-regulation of antioxidant enzymes. These biochemical shifts are accompanied by rapid changes in gene expression, including defence-related transcripts and proteins secreted into the apoplast, which collectively reinforce cell‐wall barriers and enhance pathogen recognition. Beyond the initial molecular events, phosphite has been shown to modulate hormone signalling networks—among them salicylic acid, jasmonic acid and auxin pathways—thereby integrating local responses into a systemic acquired resistance that persists for days to weeks. In practical terms, phosphite formulations have been deployed successfully in a range of cropping systems—from potato and tomato against late blight to amenity turfgrass and orchard crops—to reduce disease severity while lowering reliance on conventional fungicides. The global adoption of phosphite-based strategies aligns with sustainable disease management by offering broad-spectrum protection, compatibility with integrated pest-management schemes and potential fertilisation benefits when engineered for phosphite oxidation in planta.

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Phosphite-Induced Defense Mechanisms in Crop Disease Management publication trend

The graph below shows the total number of articles in phosphite-induced defense mechanisms in crop disease management across all publications each year (not limited to Nature Index journals).

Technical terms

Phosphite (Phi): A phosphate analogue used as a systemic pesticide and resistance inducer in plants.

Priming: A process by which prior exposure to an elicitor enhances the speed and intensity of subsequent defence responses.

Reactive Oxygen Species (ROS): Highly reactive molecules produced transiently during stress signalling, involved in pathogen restriction and signal transduction.

Antioxidant Enzymes: Enzymes such as superoxide dismutase and peroxidase that regulate ROS levels to prevent cellular damage.

Transcriptome: The complete set of RNA transcripts produced by the genome at a given time, reflecting gene expression changes after treatment.

Biostimulant: A substance that enhances plant growth or stress tolerance, often through modulation of physiological and biochemical pathways.

References

1. ROS and Oxidative Response Systems in Plants Under Biotic and Abiotic Stresses: Revisiting the Crucial Role of Phosphite Triggered Plants Defense Response. Frontiers in Microbiology (2021).
2. Review of Phosphite as a Plant Nutrient and Fungicide. Soil Systems (2021).
3. Phosphite-induced changes of the transcriptome and secretome in Solanum tuberosum leading to resistance against Phytophthora infestans. BMC Plant Biology (2014).
4. Phosphite Protects Fagus sylvatica Seedlings towards Phytophthora plurivora via Local Toxicity, Priming and Facilitation of Pathogen Recognition. PLOS ONE (2014).
5. Suppression of the auxin response pathway enhances susceptibility to Phytophthora cinnamomi while phosphite-mediated resistance stimulates the auxin signalling pathway. BMC Plant Biology (2014).
6. Phosphite Application Alleviates Pythophthora infestans by Modulation of Photosynthetic and Physio-Biochemical Metabolites in Potato Leaves. Pathogens (2020).
7. Suppression of Microdochium nivale by potassium phosphite in cool-season turfgrasses. Acta Agriculturae Scandinavica Section B - Soil & Plant Science (2012).