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TL;DR
The central result is that gall formation is a complex, multistep process requiring continuous transfer of arthropod-derived stimuli, which alters plant gene expression and development.
Life · 6 authors, 5 centres
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The central result is that gall formation is a complex, multistep process requiring continuous transfer of arthropod-derived stimuli, which alters plant gene expression and development.
This review synthesizes published research on the stimuli and molecular mechanisms underlying gall formation induced on dicotyledonous plant leaves by eriophyoid mites and insects from four orders (Diptera, Hemiptera, Hymenoptera, Lepidoptera). It analyzes evidence for arthropod-derived secretions (e.g., saliva) as primary and reinforcing inducers, host plant gene expression changes during gall development, and the multistep nature of gallogenesis. Key findings include that gall development requires continuous stimulation, as shown by studies where removal of mites or insect larvae at different times resulted in incomplete gall formation. Molecular studies reveal dynamic, stage-specific changes in plant gene expression, including genes involved in cell cycle, development, and defense. The review also discusses proposed hypotheses, such as the role of bacterial symbionts and the relationship between gall size and volume of parasite secretions. Limitations include the difficulty in collecting sufficient saliva for analysis, especially from microscopic mites, and that omics technologies have not yet identified the nature of the initial inducing agents.