Brassica oleracea plants (var Italica cv Marathon) were grown under controlled greenhouse conditions (25 ± 3 °C, 50 ± 10% relative humidity) from seeds in polystyrene pots filled with peat. After one week, seedlings were transplanted individually in 14 cm diameter plastic pots, fertilized with commercial soil (Trflor—HOCHMOOR), and watered as needed. All experiments were carried out using 5–6 week old plants.
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