Seeds of mung bean (Vigna radiata L. Wilczek), radish (Raphanus sativus L. var. ‘Flamboyant 2’), broccoli (Brassica oleracea L. var. italica ‘Ramoso Calabrese’) were purchased from Diet Food (Warsaw, Poland), and sunflower (Helianthus annuus L.) seeds from KHNO POLAN Ltd (Krakow, Poland).