Abstract
This present study was conducted to investigate the possible allelopathic effect of Oudneya africana (donor species) on Bromus tectorum (weed species) and Triticum aestivum (cv. Sahel1; crop species) through germination bioassay experiment. B. tectorum is a winter annual grass that grows in winter wheat and other crops and in both disturbed and undisturbed grasslands. The effect of O. africana aqueous leachate (OAAL) on germination and seedling growth of B. tectorum and T. aestivum was investigated. Higher concentrations of the aqueous leachate significantly reduced the germination rate of B. tectorum. Similarly, coleoptile (CL) and radicle (RL) lengths of B. tectorum seeds was significantly inhibited. To go through with this, seedling growth of the weed species was also affected. On the other hand, the germination parameters of wheat seeds were slightly affected with applying different OAAL concentration levels compared to B. tectorum. In conclusion, allelochemicals extracted from the donor species caused a significant reduction in germination and growth parameters of B. tectorum > T. aestivum. Key words: Aqueous leachate, Oudneya africana, Bromus tectorum, germination rate.
Highlights
Allelopathy was defined as the direct or indirect harmful or beneficial effects of one plant or another through the production of chemical compounds that escape into the environment (Rice, 1984)
Allelochemicals extracted from the donor species caused a significant reduction in germination and growth parameters of B. tectorum > T. aestivum
10 seeds of each of the weed and crop species were arranged in 9-cm diameter Petri-dishes lined with two discs of Whatman No 1 filter paper under normal laboratory conditions with day temperature ranging from 19 to 22°C and night temperature from 12 to 14°C. 2 ml of each level of O. africana aqueous leachate (OAAL) were added daily to three replicates
Summary
Allelopathy was defined as the direct or indirect harmful or beneficial effects of one plant or another through the production of chemical compounds that escape into the environment (Rice, 1984). Allelochemicals are plant secondary metabolites mainly produced from medicinal and aromatic plants (Delabys et al, 1998); have been identified, including the phenolic acids, coumarins, terpenoids, flavoniods, alkaloids, glycosides and glucosinolates. These chemical substances (phytotoxic) are known to be exuded by plants to suppress emergence or growth of the other plants; allelopathic effects of these compounds are often observed to occur early in the life cycle, causing inhibition of seed germination and seedling growth. Medicinal plants have inhibitory effects (Lin et al, 2003, 2004) on selected weeds and its allelochemicals inhibiting weed growth.
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