These bacteria trick plants into luring their own insect spreaders
Kumar R, Maurya R, Maity A, Tiwari RK, Lal MK
Plant Signaling
That witch's-broom-looking cluster of stunted, bushy growth on a garden shrub or roadside tree could be a phytoplasma infection that's chemically seducing leafhoppers to spread it to your other plants.
Phytoplasmas are stripped-down bacteria that live only inside plant plumbing and insect carriers, and they can't survive on their own, so they've evolved a clever trick: injecting special proteins into plants that scramble the plant's hormones and immune system. This turns leaves into flower-like structures, stunts growth into witches'-brooms, and even changes how the plant smells and tastes so that sap-sucking insects like leafhoppers are drawn in, feed longer, and carry the infection to new plants. Scientists are now using this detailed molecular map to develop new defenses, including CRISPR-edited resistant crops and RNA-based sprays.
Key Findings
Phytoplasmas infect over 1,000 plant species worldwide despite having reduced genomes and limited independent metabolism
Key effector proteins (SAP11, SAP54/PHYL1, SAP05, TENGU, SWP1) target host transcription factors, hormone pathways, and protein degradation systems to reprogram plant development and immunity
Infected plants show altered volatile chemicals and nutritional quality that change insect vector behavior, increasing transmission to new host plants
chevron_right Technical Summary
Tiny bacteria called phytoplasmas hijack over 1,000 plant species by injecting proteins that rewire plant hormones, growth, and immune defenses, even making infected plants smell and taste more attractive to the insects that spread the disease further.
Abstract Preview
Original paper
Phytoplasma-plant interactions: effector-mediated host reprogramming, hormonal crosstalk, metabolic alterations and plant-mediated vector manipulation.
Phytoplasmas are wall-less, phloem-restricted bacterial pathogens that infect over 1,000 plant species, causing substantial losses in agriculture, horticulture, and forestry worldwide. Despite thei...
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