W. repanda (ID9122) was obtained from the Rutgers Duckweed Stock Cooperative (Rutgers University, New Brunswick, NJ, USA). Plants were grown on 0.8% (w/v) agar pH 5.8, containing Schenk and Hildebrandt basal salts (1.6 g/L) and sucrose (1% w/v) in an Adaptis A1000 growth chamber (Conviron, Canada) at 19 °C and 15 °C with a 14 h light–10 h dark cycle, respectively, and a light intensity of 120 μmol quanta m−2 s−1. After 14 days of growth, the plants were washed from the surface of the agar using deionized water and kept at − 20 °C. Celery stalks (petioles) were purchased from a local supermarket.
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