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Early Detection of Botrytis cinerea Infection in Cut Roses Using Thermal Imaging.

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Summary

Thermal imaging can detect gray mold disease (GMD) in cut roses before symptoms appear. Infected rose petals show a significant temperature increase, enabling early GMD detection and reducing crop loss.

Keywords:
gray mold diseasepetal temperaturepostharvestrosethermographyvase life

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Area of Science:

  • Plant Pathology
  • Horticultural Science
  • Agricultural Technology

Background:

  • Gray mold disease (GMD), caused by *Botrytis cinerea*, significantly reduces the quality and economic value of horticultural crops, including cut roses.
  • Early detection of GMD is crucial for preventing postharvest losses during distribution.
  • While thermal imaging shows promise for GMD detection in potted plants, its efficacy in cut roses remains unestablished.

Purpose of the Study:

  • To investigate the utility of thermal imaging for the early detection of *Botrytis cinerea* infection in cut roses.
  • To monitor changes in petal temperature as an indicator of GMD development.
  • To correlate thermal changes with disease severity and postharvest quality.

Main Methods:

  • Cut roses were inoculated with varying concentrations of *Botrytis cinerea* conidial suspensions.
  • Petal temperature was monitored using thermal imaging post-inoculation.
  • Postharvest quality parameters, including flower opening and vase life, were assessed.
  • Gene expression related to ethylene, reactive oxygen species, and water transport was analyzed.

Main Results:

  • *Botrytis cinerea* infection negatively impacted cut rose postharvest quality, reducing flower opening and vase life.
  • Infected rose petals exhibited a significantly higher average temperature compared to non-inoculated controls.
  • A temperature increase of 1.1 °C was observed in infected petals one day prior to visible necrotic symptom development.
  • Increased petal temperature correlated strongly with GMD symptom severity and fungal biomass.
  • Elevated petal temperature was associated with altered mRNA levels of genes involved in ethylene signaling, ROS production, and water transport.

Conclusions:

  • Thermal imaging is an effective tool for detecting temperature variations in cut rose petals caused by *Botrytis cinerea* infection.
  • The observed temperature increase in infected petals provides a reliable indicator for early GMD detection.
  • Thermography offers a promising, non-invasive method for the early diagnosis of GMD in the cut flower industry, potentially reducing postharvest losses.