Allelopathic Potential of Selected Invasive Alien Weed Species and Mathematical Modelling of Rhizospheric Soil Impact of Ageratum conyzoides on Phaseolus vulgaris L. — Oak Academic Publishing
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Allelopathic Potential of Selected Invasive Alien Weed Species and Mathematical Modelling of Rhizospheric Soil Impact of Ageratum conyzoides on Phaseolus vulgaris L.
Department of Agronomic and Applied Molecular Sciences, University of Buea, Buea, Cameroon
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Department of Plant Science, Faculty of Science, University of Buea, Buea, Cameroon
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Department of Plant Science, Faculty of Science, University of Buea, Buea, Cameroon
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Department of Agronomic and Applied Molecular Sciences, University of Buea, Buea, Cameroon
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Department of Agronomic and Applied Molecular Sciences, University of Buea, Buea, Cameroon
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Department of Plant Science, Faculty of Science, University of Buea, Buea, Cameroon
1 Department of Agronomic and Applied Molecular Sciences, University of Buea, Buea, Cameroon
2 Department of Plant Science, Faculty of Science, University of Buea, Buea, Cameroon
3 Department of Plant Science, Faculty of Science, University of Buea, Buea, Cameroon
4 Department of Agronomic and Applied Molecular Sciences, University of Buea, Buea, Cameroon
5 Department of Agronomic and Applied Molecular Sciences, University of Buea, Buea, Cameroon
6 Department of Plant Science, Faculty of Science, University of Buea, Buea, Cameroon
Terrestrial invasive alien weed plants are known to infest cultivated land, potentially releasing allelochemicals into the rhizosphere during decomposition, negatively impacting crop growth. This study aimed to evaluate: (1) the allelopathic activity of five invasive weed species ( Ageratum conyzoides , Bidens pilosa , Cecropia peltata , Tithonia diversifolia , and Chromolaena odorata ) on Lactuca sativa and Phaseolus vulgaris growth; and (2) the effects of A. conyzoides rhizospheric soil on P. vulgaris seed germination. Bioassays of aqueous and leachate extracts were prepared from fresh leaves of the invasive species at concentrations of 0%, 25%, 50%, 75%, and 100% to assess allelopathic effects on L. sativa and P. vulgaris seed germination. Additionally, rhizospheric soil from A. conyzoides stands was collected, processed, and applied at varied weights (0.5 - 7 kg) to P. vulgaris seeds, with germination observed over nine days. Polynomial regression analysis was applied to model the data. High-concentration extracts (75% and 100%) significantly inhibited germination, root, and shoot growth in both L. sativa and P. vulgaris ( P < 0.05), while lower concentrations (25% and 50%) showed either stimulatory or minimal inhibitory effects. An eighth-degree polynomial model best fits the data, providing predictive insights into allelochemical effects, represented by the equation: y = 100.01397 − 28.933788x + 74.985596x 2 − 80.294922x 3 + 41.541115x 4 − 11.747532x 5 + 1.8501702x 6 − 0.1519795x 7 + 0.0050631x 8 . Allelopathic effects were concentration-dependent, with roots more sensitive than shoots to the invasive extracts. L. sativa was the most susceptible, while P. vulgaris showed greater tolerance. Modelling the allelopathic impact of A. conyzoi des rhizospheric soil offers valuable insight into the allelochemical dosage necessary to affect seed germination, informing potential agricultural management strategies for invasive plant control.
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