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<p>Allelopathy which is the direct or indirect harmful or beneficial effect of one plant on another through the release of certain chemical compounds into the environment, remains a key phenomenon influencing the performance of agricultural crops. Fresh whole samples of four invasive weed species viz. <i>Ageratum houstanianum</i>, <i>Alternanthera brasiliana</i>, <i>Hyptis suaveolens</i> and <i>Mimosa invisa</i> were collected from natural population and examined for the allelopathic effect of their component parts on the germination of <i>Solanum lycopersicum</i>. Aqueous extracts of parts of the selected invasive plant species at four extraction times (24, 48, 72 and 96&#xa0;h) were tested on the seeds of <i>S. lycopersicum</i> L. and a three-way analysis of variance was carried out to determine the interaction effect among fixed variables. The leaf aqueous extracts of selected invasive species significantly inhibited germination of <i>S. lycopersicum</i>, although only <i>M. invisa</i> had all its parts inhibiting the germination of <i>S. lycopersicum</i> (<i>p</i> &lt; 0.05). The fixed‑effects three‑way analysis of variance revealed significant main effects of species, plant part, and extraction time on inhibition percentage (<i>p</i> &lt; 0.001) for all factors, and the three‑way interaction (species × part × time) was also significant (<i>p</i> &lt; 0.05), demonstrating that the inhibitory response to extraction time depended jointly on both species identity and the plant part extracted. The allelopathic effect of the invasive species depended on extraction time and was more pronounced in the aqueous leaf extract 72&#xa0;h before extraction. This study concluded that inhibition of germination of seeds of <i>S. lycopersicum</i> was species-specific and the leaves of <i>H. suaveolens</i> possessed the highest inhibitory effect of all the aqueous extracts used in this study.</p>

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Allelopathic effect of aqueous extracts of some invasive plant species on the germination of Solanum lycopersicum L.

  • 期刊论文

  • 发表日期：

    2026年7月16日

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  • Nelson Obinna Uwalaka,
  • Evelyn Odinaka Umeh,
  • Vitalian Odira Obiekee,
  • Emmanuella Chiamaka Emeka,
  • Chinenye Sylverline Ekeh,
  • Obinna Augustine Anum

摘要

Allelopathy which is the direct or indirect harmful or beneficial effect of one plant on another through the release of certain chemical compounds into the environment, remains a key phenomenon influencing the performance of agricultural crops. Fresh whole samples of four invasive weed species viz. Ageratum houstanianum, Alternanthera brasiliana, Hyptis suaveolens and Mimosa invisa were collected from natural population and examined for the allelopathic effect of their component parts on the germination of Solanum lycopersicum. Aqueous extracts of parts of the selected invasive plant species at four extraction times (24, 48, 72 and 96 h) were tested on the seeds of S. lycopersicum L. and a three-way analysis of variance was carried out to determine the interaction effect among fixed variables. The leaf aqueous extracts of selected invasive species significantly inhibited germination of S. lycopersicum, although only M. invisa had all its parts inhibiting the germination of S. lycopersicum (p < 0.05). The fixed‑effects three‑way analysis of variance revealed significant main effects of species, plant part, and extraction time on inhibition percentage (p < 0.001) for all factors, and the three‑way interaction (species × part × time) was also significant (p < 0.05), demonstrating that the inhibitory response to extraction time depended jointly on both species identity and the plant part extracted. The allelopathic effect of the invasive species depended on extraction time and was more pronounced in the aqueous leaf extract 72 h before extraction. This study concluded that inhibition of germination of seeds of S. lycopersicum was species-specific and the leaves of H. suaveolens possessed the highest inhibitory effect of all the aqueous extracts used in this study.