Plant-Aphid Interactions and Resistance Mechanisms

Aphids are ubiquitous phloem-feeding insects that inflict substantial yield losses across a wide range of crops. Their stylet probes navigate through plant tissues to reach sieve elements, where aphids inject a cocktail of salivary effectors and small RNAs that modulate host signalling and suppress defences. Plants counter these attacks through constitutive barriers and inducible immune responses. Cell surface receptors perceive aphid-derived elicitors, triggering pattern-triggered immunity, while intracellular resistance proteins often belonging to the NB-LRR family detect effectors to initiate stronger effector-triggered immunity. Downstream responses include oxidative bursts, callose deposition at sieve plates, and the activation of hormone-mediated pathways—chiefly the salicylic acid and, in some contexts, jasmonic acid routes. Structural defences, such as reinforced cell walls and phloem occlusions, further restrict aphid access. Advances in transcriptomics and proteomics have unveiled species-specific and conserved effector repertoires that underpin aphid adaptability and host range. Insights into the genetic basis of plant resistance, including single-gene and quantitative trait loci, are informing breeding strategies aimed at antixenosis, antibiosis and tolerance. Integrating molecular understanding of plant defence with field-tested resistance traits is vital for developing durable, environmentally sound control of aphid pests.

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Plant-Aphid Interactions and Resistance Mechanisms publication trend

The graph below shows the total number of articles in plant-aphid interactions and resistance mechanisms across all publications each year (not limited to Nature Index journals).

Technical terms

Phloem: The living vascular tissue that transports photosynthates and nutrients, which aphids exploit as a food source.

Effector: A secreted aphid molecule—often a protein or small RNA—that manipulates host cell processes to facilitate infestation or suppress immunity.

Salicylic acid signalling pathway: A plant hormone-mediated defence mechanism particularly effective against biotrophic pathogens and phloem-feeding insects.

Callose deposition: The rapid synthesis of a β-1,3-glucan polymer at sieve plates or plasmodesmata to block phloem sap flow and impede aphid feeding.

References

1. Cross-kingdom RNA interference mediated by insect salivary microRNAs may suppress plant immunity. Proceedings of the National Academy of Sciences of the United States of America (2024).
2. SmCSP4 from aphid saliva stimulates salicylic acid‐mediated defence responses in wheat by interacting with transcription factor TaWKRY76. Plant Biotechnology Journal (2023).
3. Functional Evaluation of Proteins in Watery and Gel Saliva of Aphids. Frontiers in Plant Science (2016).
4. Plant immunity in plant–aphid interactions. Frontiers in Plant Science (2014).
5. How phloem-feeding insects face the challenge of phloem-located defenses. Frontiers in Plant Science (2013).
6. Comparative transcriptomics and proteomics of three different aphid species identifies core and diverse effector sets. BMC Genomics (2016).