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A comprehensive analysis of the responses of Nigella sativa L. to elevated zinc concentrations was assessed in pot experiments. Zn excess supply did not affect the germination but drastically reduced radicle elongation. A concentration-dependent reduction in all growth parameters, yield, and yield components was observed. With the increasing Zn concentrations, total lipid contents decreased and changes in fatty composition toward the production of saturated ones were underscored. Despite the reduction in the seeds essential oil yield, a redirection of the terpene metabolism toward the synthesis of oxygenated compounds has been evidenced. A significant increase in the total phenols and flavonoids contents concomitant with improved antioxidant activities has also been found. Collectively, these results highlight the possible use of N. sativa L. in phytoremediation applications, on the one hand, and that Zn excess could represent an excellent alternative to improve the nutritional attributes of this important species, on the other hand.

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The main aims of this study were to analyze the chemical composition and total phenolic, and to evaluate the in vitro fermentation and antioxidant activities from some shrubs (Erica arborea, Myrtus communis, Arbutus unedo and Phillyrea latifolia). The determination of the chemical composition, total phenolic, flavonoid contents and the antioxidant activity were investigated by using in vitro methods. The in vitro gas production and ruminal parameters were determined in the presence of goat rumen juice. Total nitrogen content was significantly high with Myrtus communis (p less than 0.01). Total phenolic and flavonoid content vary by species and season (p less than 0.01). It can be concluded that all parameters were significantly affected by the seasonal period and the shrubs nature. Expect the OM that was similar regardless the seasonal period.

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