With the development of scientific knowledge, approaches towards different peripheries are being changed. Likewise, use of chemicals sprays in agricultural field is discouraged by experts because of high cost and its lethal effects on environment and health because pesticides residues. Therefore; researchers are focusing on alternate methods to use the naturally occurring substances to control pests. These natural compounds found in medicinal plants which interact with other plants species chemically1. Such chemical interaction is termed as allelopathy. Allelopathy is a biological event in which plant produces one or more biochemicals that influence the germination, growth, survival, and reproduction of other plants by production of chemical compounds (Allelochemicals)2. Leaves are considered the most reliable source of Allelochemicals3.
Artemisia (Artremisia monosperma) and thyme (Thymus vulgaris) are significant medicinal plants in Saudi Arabia and traditionally have been utilized for numerous medicinal purposes. The quantitative analysis of aqueous extract of A. monosperma exhibited the presence of phenolic compounds and flavonoids that can play a role of allelochemicals agents4. T. vulgaris is reported to have the volatile oils having toxic effect on germination of seed and growth of some plants5. While on the other hand, pea (Pisum sativum L.) is one of the most important leguminous crops in Saudi Arabia, but its output is limited by allelochemicals6,7.
A research was performed to assess the impact of different concentrations of leaf aqueous extract of Artrmisia monosperma and Thymus vulgaris on growth criteria, physio-biochemical attributes and antioxidant enzyme activities of pea seedlings. In experiment; germination of pea was carried out in Petri dishes under diverse concentrations (0, 2, 4, 6, 8 and 10%) of leaf aqueous extracts of the two medicinal plants collected from natural habitats in Saudi Arabia. At the final stage of trial (10 days), the growth and physio-biochemical characteristics of pea seedlings were calculated. One-way ANOVA was used to analyze the data.
It was observed that leaf aqueous extracts of A. monosperma and T. vulgaris abridged germination potential, shoot and root length, total free amino acids and proline content of pea plant. Conversely, carbohydrates, proteins, K+, Ca2+ and the activity of antioxidant enzymes were boosted which indicates the occurrence of allelochemicals causing both inhibition and stimulation of the tested parameters. The highest inhibitory or stimulatory impacts of leaf aqueous extract were examined at concentrations 8 and 10%. T. vulgaris was noted to be more effective as compared to A. monosperma. This investigation found that the two medicinal plants had allelopathic compounds, which may leads towards their potential use as herbicides to control weeds and as an alternative of chemical compounds.
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18 August, 2019