Ahlam Al-Watban and Hediat M.H.Salama
The objective of this study was to determine the impact of allelopathic potentials of aqueous extract of Artemisia monosperma aerial parts on germination and metabolite accumulation in common bean seedlings. Artemisia monosperma collected from Al-Thomamah region, Saudi Arabia and the experimental design was a complete randomized with four replicates. The results showed that the quantitative analysis of aqueous extract of Artemisia contained the phenolic compounds and flavonoids that might be implicated as allelochemicals agents. The germinated seedlings after 8 days were inhibited with the increase in concentration of aqueous Artemisia aerial parts, but the phenolic compounds of the common bean seedlings had stimulatory effects with high level of concentration of Artemisia aerial parts extract. Degradation of storage carbohydrates of common bean seedlings was significantly retarded with increasing the concentration of Artemisia aerial parts extract. It seems that the retardation was attributed to the activity inhibition of amylase enzyme that reduced the contents of reducing and non-reducing sugars. However, the polysaccharides remained at high level when compared with those of the control. While, inhibition of protease activity led to accumulation of free amino acids and protein contents in germinated seedlings of common bean. Although aqueous extract of Artemisia shoots contain allelopathic chemicals and phytotoxic, this effect led to increase in unsaturated fatty acids than saturated fatty acids in germinated common bean seeds.
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