Needle patch spots tomato disease before symptoms show
Cao C, Jiang D, Zhang X, Pal T, Liu Z
Crispr
If you grow tomatoes, a sticky patch pressed on a leaf could warn you about bacterial speck disease three days before the telltale black spots show up, giving you time to act before it spreads through your whole bed.
Researchers built a small patch covered in microscopic needles that gently pierce a tomato leaf's outer layer without harming the plant, pulling out tiny amounts of fluid in minutes. That fluid gets tested with a CRISPR-based tool that lights up if it detects DNA from the bacteria causing tomato bacterial speck. In test plants, the patch caught the infection a full day before any visible spots appeared, and it works without needing a lab, just a sample and a couple of hours.
Key Findings
Microneedle patch made of polyvinyl alcohol extracts pathogen DNA directly from the leaf's apoplast (intercellular space) within minutes, without destructive sampling
CRISPR fluorescence assay detects unamplified target DNA at 0.16 nM, or as few as 1,000 copies with PCR preamplification; bacterial detection limit is 10,000 CFU/mL unamplified and 1,000 CFU/mL with PCR, all within 2 hours
In inoculated tomato plants, the platform detected Pseudomonas syringae infection on day 3 post-inoculation, 24 hours before visible necrotic speck symptoms appeared
chevron_right Technical Summary
Scientists created a tiny patch of microscopic needles that painlessly pulls fluid from a tomato leaf and uses a CRISPR-based test to detect bacterial infection days before any visible damage appears, offering a fast, in-field alternative to lab testing.
Abstract Preview
Original paper
Microneedle-Assisted CRISPR Biosensing Platform for Presymptomatic Detection of Plant Diseases.
Presymptomatic diagnosis of tomato bacterial speck caused by Pseudomonas syringae requires rapid sample preparation and specific molecular readout. Although existing methods offer high reliability,...
open_in_new Read full abstractAbstract copyright held by the original publisher.
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