<div>Background: Temperature and salinity effects on the germination and seedling growth of two subspecies of Atriplex halimus were studied in order to select the best one for the rehabilitation of degraded lands at risk of desertification. 
 
Methods: Influence of salinity levels (0, 100, 200, 300 and 400 mM) and temperature (15, 20, 25, 30 and 35&deg;C) on seed germination of two subspecies of Atriplex halimus, halimus and Schwein furthii, were assessed. Results showed optimal germination at NaCl concentration of 100 mM that decreases above 200 mM for both subspecies. In sp Schwein furthii the germination capacity is higher at NaCl concentration of 100 mM and temperatures varying between 20 and 30&deg;C. 
 
Result: High doses of salt (300 and 400 mM) strongly decrease the number of seeds germinated at all temperature regimes. In contrast, at temperatures between 30 and 35&deg;C, seed germination appears to be strongly affected in sphalimus. Salinity levels of 300 and 400 mM with temperatures of 15, 20 and 35&deg;C, reduce germination and increase mean germination time. The presence of 100 mM of NaCl in the culture medium sometimes appears to be beneficial for the growth of the seedlings. However, at high doses of salt (300 and 400 mM), length, fresh and the dry weight of the seedlings are reduced.</div>

Effect of Salinity and Temperature on Seed Germination of Atriplex halimus L. (halimus and schweinfurthii subspecies) Harvested in Western Algerian Region

Background: Natural products possess interesting biological activities, which attracted several researchers to their elucidation to provide knowledge that will lead to the advancement medicine. Chenopodaceae is an important plant family in the world; it contains a number of phytochemicals and has been used to treat a wide range of human diseases. The aim of this work was to carry out qualitative analyses of secondary metabolites and an antimicrobial investigation on the crude extracts from Atriplex halimus (Chenopodaceae) growing in Algerian Sahara.&nbsp; 
 
Methods: In this laboratory investigation during 2021-2022, phytochemical screening based on staining and precipitation tests was carried out using some solvents of different polarities. The antibacterial essay was carried out by the disc diffusion method on solid medium, using seven bacterial strains chosen for their high pathogenicity. 
 
Result: The secondary metabolites detected in the various extracts were essentially flavonoids, tannins, saponins and terpenoids. The antibacterial investigation made it possible to know that the aqueous extract from Atriplex halimus showed a significant inhibition against all bacteria tested. Diethyl ether and chloroform exracts had only one activity against Enterococcus faecalis and Listeria monocytogenes, respectively, whereas the methanolic extract exhibited the highest inhibition of Pseudomonas aeruginosa.

Effect of Salinity and Temperature on Seed Germination of Atriplex halimus L. (halimus and schweinfurthii subspecies) Harvested in Western Algerian Region

Phytochemical Screening and Antibacterial Activity of Some Extracts from Atriplex halimus Growing in Algerian Sahara