Alemayehu Yiftusira, Chimdesa Meseret, Yusuf Zekeria
School of Biological Sciences and Biotechnology, Haramaya University, Dire Dawa, Ethiopia.
Scientifica (Cairo). 2024 Apr 16;2024:9557081. doi: 10.1155/2024/9557081. eCollection 2024.
Allelopathy is the chemical interactions between plants that might lead to either stimulation or inhibition of growth, community structure, and plant invasions. L. is a noxious invasive weed that negatively affects seed germination, seedling growth, and increases the mortality of the crop plant. The objective of this work was to assess allelopathic effect of leaf aqueous extract on germination and seedling growth of (pepper) and (carrot). The aqueous extract of Lantana leaf samples was used as a source of allelopathic effects. Data were collected for germination and seedling growth parameters. The result indicated that the highest concentration of the allelopathic extract (20 mg/L) has demonstrated significantly the highest germination inhibition rate GIR (60.00%), germination speed V (2.54 U/day) for as GIR (70.00%), mean germination time MGT (0.36 days), and GI (0.67%) for seeds. The highest concentration of the allelopathic extract (20 mg/L) has recorded the highest plumule inhibition rate PIR (59.63%) and radical inhibition rate RIR (48.95%) for seeds, as well as PIR (27.47%) and RLR (79.49%) for . The largest negative allelopathic index (-60.00% or allelopathic intensity of 60.00%) was recorded for seeds, whilst (-63.43% or allelopathic intensity of 63.43%) was recorded for seed germination. For seed germination, the first principal component (PC1) has got high positive loads from GI (0.36), RLR (0.31), GR (0.34), allelopathic index AI (0.34), relative length of plumule RLP (0.24), and V (0.30). By contrast, PC1 for seed germination has got the highest negative component loads recorded by GIR (-0.34), PIR (-0.24), MGT (-0.35), and RIR (-0.31). In allelopathic effect on seed germination, the first principal component (PC1) has got high positive scores from relative length of radical RLR (0.31), RLP (0.33), germination rate GR (0.33), V (0.33), and AI (0.33). Likewise, the high negative component loads were recorded by GIR (-0.33), PIR (-0.33), RIR (-0.31), and MGT (-0.32). The result of the present study demonstrated that GIR, PIR, and RIR were directly related to negative allelopathic activity.
化感作用是指植物之间的化学相互作用，这种作用可能会刺激或抑制植物的生长、群落结构以及植物入侵。马缨丹是一种有害的入侵杂草，会对种子萌发、幼苗生长产生负面影响，并增加农作物的死亡率。本研究的目的是评估马缨丹叶水提取物对辣椒和胡萝卜种子萌发及幼苗生长的化感作用。马缨丹叶样本的水提取物被用作化感作用的来源。收集了种子萌发和幼苗生长参数的数据。结果表明，化感提取物的最高浓度（20mg/L）对辣椒种子的发芽抑制率（GIR）最高，达60.00%，发芽速度（V）为2.54U/天，平均发芽时间（MGT）为0.36天，发芽指数（GI）为0.67%；对胡萝卜种子的发芽抑制率（GIR）为70.00%，平均发芽时间（MGT）为0.36天。化感提取物的最高浓度（20mg/L）对辣椒种子的胚轴抑制率（PIR）最高，为59.63%，胚根抑制率（RIR）为48.95%；对胡萝卜种子的胚轴抑制率（PIR）为27.47%，胚根相对长度（RLR）为79.49%。辣椒种子的最大负化感指数为-60.00%（化感强度为60.00%），而胡萝卜种子萌发的负化感指数为-63.43%（化感强度为63.43%）。对于辣椒种子萌发，第一主成分（PC1）在发芽指数（GI，0.36）、胚根相对长度（RLR，0.31）、发芽率（GR，0.34）化感指数（AI，0.34）、胚轴相对长度（RLP，0.24）和发芽速度（V，0.30）上有较高的正负荷。相比之下，胡萝卜种子萌发的PC1在发芽抑制率（GIR，-0.34）、胚轴抑制率（PIR，-0.24）、平均发芽时间（MGT，-0.35）和胚根抑制率（RIR，-0.31）上有最高的负成分负荷。在对辣椒种子萌发的化感作用中，第一主成分（PC1）在胚根相对长度（RLR，0.31）、胚轴相对长度（RLP，0.33）、发芽率（GR，0.33）、发芽速度（V，0.33）和化感指数（AI，0.33）上有较高的正得分。同样，在发芽抑制率（GIR，-0.33）、胚轴抑制率（PIR，-0.33）、胚根抑制率（RIR，-0.31）和平均发芽时间（MGT，-0.32）上有较高的负成分负荷。本研究结果表明，发芽抑制率、胚轴抑制率和胚根抑制率与负化感活性直接相关。
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