Effects of treatments on production of useful natural products of Pelargonium graveolens L'Hér.
Effects of treatments on production of useful natural products of Pelargonium graveolens L'Hér.
- Author(s) L. Oualha, S. Messgo-Moumene, A. Aissat, N. Ayachi, D. Saddek, M. Bellatreche and H. M. El-Shora
- Year: 2022
- Month: January
- Volume: 55
- Pages: 35-50
We evaluated the stimulatory effects of aqueous extracts of Posidonia oceanica L. Delile (Aquatic Plant), Ulva rigida C. Agardh (Algae), coffee spent residues and conidial suspensions of two isolates of Trichoderma spp. (A and B) to increase its plant biomass, methanolic extract yield, phenolic compounds content and the antioxidant power in Pelargonium graveolens L'Hér. The aqueous extracts and conidial suspensions were applied in irrigation water to plants of Pelargonium graveolens during vegetative growth (autumn) and flowering (spring). All applied treatments increased the vegetative biomass of plants, content of chlorophyll, carotenoids and phenolic compounds (including flavonoids, flavonols and condensed tannins), and their antioxidant power except isolate (A) of Trichoderma sp. The highest IC50 values (0. 35 mg/mL and 0.40 mg/mL) were recorded for plants treated with P. oceanica L. and U. rigida C. extracts, respectively. These values were calculated at the vegetative stage in autumn, which remained low compared to that of ascorbic acid (0.09 mg/mL). The infrared spectroscopic analysis of P. graveolens L. dry weight showed the presence of chemical groups characteristic to phenolic compounds and the transmittance values of the spectra revealed a better absorption of the radiation in plant samples treated with the above mentioned extracts. These results confirm the presence of higher content of phenolic compounds responsible for increased antioxidant activity compared to the other treatments. The bio-stimulatory effect of these treatments can be recommended as biological inputs for industrial-scale production of P. graveolens L.
