| Summary: | Allelopathy is considered as a physiological phenomenon with ecological implications that have stimulatory or inhibitory effects on organisms. The aim of the present study was focused on the effect of Ulva lactuca aqueous extract on growth and some physiological and metabolic aspects as well as gene expression of both Dunaliella salina and Chlorella salina. Linoleic acid ethyl ester; Propanoic acid, 3-(methylthio); Ethanol, 2-(9-octadecenyloxy)-, (Z); Oleic Acid; and 9-Octadecynoic acid, methyl ester were active phytochemical compounds detected from the gas chromatography-mass spectrometry (GC–MS) analysis for the donor species aqueous extract. Data revealed that U. lactuca contains appreciable amounts of Mg, K, Ca, Na and Fe. Results showed a dramatic effect of U. lactuca extracts on growth of both D. salina and C. salina, which significantly increased at low extract concentrations and vice versa. The activity of total antioxidants achieved a gradual increase by increasing the extract concentration. Furthermore, the two recipient algae attained the highest value of protein polymorphism under 10% extract concentration. Sequences of soluble inorganic pyrophosphatases (sPPases) gene showed that, allelochemicals of U. lactuca extract reflected the highest genetic variation in C. salina and D. salina while causing a significant variation in different biochemical parameters.
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