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High-Throughput Identification of Resistance to Pseudomonas syringae pv. Tomato in Tomato using Seedling Flood Assay
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Postharvest Decay Risk Associated with Hydrocooling Tomatoes.

Clément Vigneault1, Jerry A Bartz2, Steven A Sargent3

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Hydrocooling tomatoes with chlorinated water prevents decay. Optimizing water contact and chlorine levels minimizes water uptake and pathogen risk, ensuring safe, quality produce.

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Area of Science:

  • Horticultural Science
  • Food Safety
  • Postharvest Technology

Background:

  • Tomatoes are susceptible to decay during postharvest storage.
  • Hydrocooling is a rapid cooling method, but water uptake can increase pathogen risk.
  • Controlling microbial contamination during hydrocooling is crucial for maintaining tomato quality.

Purpose of the Study:

  • To evaluate the efficacy of hydrocooling with chlorinated water in preventing tomato decay.
  • To assess the impact of hydrocooling methods on water uptake and potential pathogen internalization.
  • To determine optimal conditions for hydrocooling tomatoes to minimize risks.

Main Methods:

  • Tomatoes were hydrocooled using a shower or flume system with varying levels of free chlorine (0-200 ppm) and bacterial suspensions (Erwinia carotovora, Rhizopus stolonifer).
  • Water uptake and weight changes were measured under different cooling durations and orientations.
  • Phytotoxicity and ripening were assessed after treatment.

Main Results:

  • Hydrocooling with 50-200 ppm free chlorine prevented decay from Erwinia carotovora during 10-day storage.
  • Chlorinated water reduced disease incidence compared to non-chlorinated water.
  • Shower hydrocooling resulted in greater water uptake than flume cooling, especially with stem scar exposure.
  • Intermittent submersion reduced water uptake compared to continuous submersion.

Conclusions:

  • Hydrocooling is a viable method for rapid tomato cooling.
  • Chlorine levels up to 200 ppm are effective and non-phytotoxic.
  • Minimizing continuous water contact and optimizing chlorine concentration reduces decay and water uptake risks.