Pilot Cultivation of the Local Endemic Cretan Marjoram Origanum microphyllum (Benth.) Vogel (Lamiaceae): Effect of Fertilizers on Growth and Herbal Quality Features
2021
Fanourakis, Dimitrios | Paschalidis, Konstantinos | Tsaniklidis, Georgios | Tzanakakis, Vasileios A. | Bilias, Fotis | Samara, Eftihia | Liapaki, Eleftheria | Jouini, Manal | Ipsilantis, Ioannis | Maloupa, E. (Eleni) | Tsoktouridis, Georgios | Matsi, Theodora | Krigas, Nikos
Wild phytogenetic resources are threatened by overexploitation. This pressure on species and natural ecosystems can be alleviated in part by recruiting and domesticating wild-growing species under pilot cultivation with tailor-made fertilization schemes. This study focused on the pilot cultivation of Origanum microphyllum—a critically endangered local endemic plant of Crete, Greece—investigating the effect of conventional and integrated nutrient management () fertilizers by foliar or root application and biostimulant. Above-ground biomass together with leaf chlorophyll fluorescence and color (SPAD meter, DA meter, Chroma Meter) were determined. Leaf chlorophyll, antioxidant compound (carotenoids, phenols, flavonoids), and nutrient contents were also assessed. The results showed that fertilization did not significantly affect plant growth and leaf nutrient content. Root fertilization was associated with greener leaves compared to foliar. The same trend was generally evident for antioxidant compound content. The small size of leaves may have impeded the efficiency of the foliar application. In conclusion, root application of conventional or INM fertilizers seems more suitable to promote visual quality and herbal antioxidant profile of O. microphyllum, than the foliar one.
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