Osmoregulation and antimic robial activity of two egyptian true xerophytes launaea spinosa (forssk.)‎ and leptadenia pyrotechnica (forssk.)‎

الملخص EN

In the present work, some of the adaptive responses against dehydrative factors were evaluated in two true xerophytic plants, for their medicinal importance: [Launaea spinosa (Forssk.) Sell, and Leptadeniapvrotechnica (Forssk.) Decne.] glowing naturally (wild plants) at Wadi Hagul.

Eastern Desert of Egypt diuing both wet and dry seasons.

The results reveled that Launaea spinosa achieved the highest significant ash concentration during the dry season and this was mainly due to accumulation of Na+, K+.

Cl" and S042".

meanwhile the opposite was found in Leptadenia pvrotechnica, which accumulated Ca2+.

Mg2+ and P3" diuing the wet season.

The highest significant concentrations of total carbohydrates, insoluble sugars as well as phytohonnones were recorded diuing the wet season, while organic acids, free thiols, total fibers, and soluble sugars were accumulated, in both species, during the diy season.

From the results it is clear that, ethyl acetate extracts for both species possessed the highest antimicrobial activity against all tested fungal and bacterial strains.

The obtained results showed that the studied species have different mechanisms to adapt and tolerate the various environmental conditions.