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| Phytotoxic Effects of Thorn Apple (Datua stramonium L.) Seed Aqueous Extract on Seed Germination of some Leguminous Crops Using Probit Analysis |
Awadallah B. Dafaallah, Waleed N. Mustafa and Yasir H. Hussein
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Abstract:
Solanaceae plants are phytotoxic in nature as they produce and release many allelochemical compounds into the ecosystem. This study was carried out to investigate the phytotoxic effects of the seeds aqueous extract of thorn apple (Datua stramonium L.) on seed germination of common bean (Phaseolus vulgaris L.), cowpea (Vigna sinensis [L.] Walp.), pigeon pea (Cajanus cajan [L.] Millsp.) and alfalfa (Medicago sativa L.) using probit analysis. Laboratory experiments were carried out at the Faculty of Agricultural Sciences, University of Gezira, Sudan in season 2014/15. Ten concentrations (4.62, 9.26, 13.87, 18.51, 23.12, 27.74, 32.36, 36.98, 41.61 and 46.28 g/l) of the seeds aqueous extract of D. stramonium were prepared from the stock solution (100 g / l). A control with sterilized-distilled water was included for comparison. Treatments were arranged in completely randomized design with four replicates. The seeds were examined for inhibition (%) in germination at three days after initial germination. Data were subjected to probit analysis (P £ 0.5). The results showed that the seeds aqueous extract of D. stramonium inhibited the seed germination of the tested leguminous crops and there was direct positive relationship between concentration (g/l) and inhibition (%).The results also showed that the LC50 for common bean, cowpea, pigeon pea and alfalfa was 20.7, 21.9, 22.2 and 22.2 g/l, respectively. It was concluded that that the aqueous extract of thorn apple (D. stramonium L.) was phytotoxic to the seed germination of the tested leguminous crops.
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