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The main objective of the present study was to assess the effect of cold and hot Nigella sativa seeds aqueous extracts (NSSCAE and NSSHAE, respectively) and Nigella sativa seeds crude powder (NSSCP) on germination, some growth parameters and chemical constituents of Lupinus termis L. in mixed cropping system. Proximate analysis of Nigella sativa seeds showed that it contains oil, crude protein and ash beside significant amounts of vital mineral elements. The germination percentage was notably decreasing with increasing the concentrations of NSSCAE and NSSHAE. The effect on hypocotyl (HL) and radicle lengths (RL) of L. termis seeds was highly recognized. The applied concentrations of NSSCP caused a significant decline in growth parameters of L. termis. In addition, there was an inverse proportional relationship between increasing NSSCP concentrations and chlorophyll a and b, carotenoids and total pigment content of leaves. The variation in some biochemical constituents of L. termis seeds as affected by different concentrations of NSSCP was documented. The study concluded that seeds of Nigella sativa adversely affect seed germination and seedling growth of L. termis.

T HE MOST plentiful and important seagrass in the Mediterranean Sea is Posidonia oceanica L. (Delile) because of its ability to create a three-dimensional habitat with high biodiversity and to build the "matte"(a terrace of interlaced rhizomes and roots trapping sediment). This matte highly influences coast features in terms of wave attenuation and shoreline stabilization. In addition, P. oceanica meadows, which could extend along the coast, from the shoreline until 40m depth, are directly exposed to anthropic pressure coming from the coastal zones and it is particularly sensitive to the environmental conditions. In the last decades, human activities in coastal areas impacted sedimentary processes severely affecting P. oceanica meadows with consequent seagrass loss. This review aims to shed light on the importance of this plant, the extent of its dangerous status, and to urge the international community and governments to try to protect it in all possible ways, especially in Egypt.