PDF(Pubmed)
Abstract：
The spontaneous plant landscape is a key focus in the development of urban environments. While many spontaneous plants can coexist with bryophytes to create appealing wilderness landscapes, the potential allelopathic effects of bryophytes on the growth of neighboring spontaneous plants remain uncertain. This study evaluated the allelopathic impact of Thuidium kanedae aqueous extracts on the germination and seedling growth of prevalent urban spontaneous plants by analyzing seed germination, seedling growth morphology, and associated indices. We also investigated the allelopathic potential of the predominant compounds in the extract on seed germination. Our findings reveal that the aqueous extract significantly impeded the seed germination of Ophiopogon japonicus, Taraxacum mongolicum, and Viola philippica, with the level of inhibition correlating positively with concentration. In contrast, Senecio scandens seed germination showed a concentration-dependent reaction, with low concentrations promoting and high concentrations hindering germination. The extract consistently reduced root length in all four species, yet it appeared to increase root vigor. The chlorophyll content in O. japonicus and V. philippica seedlings reached a maximum at a concentration of 5 g/L and decreased with higher extract concentrations. The treatment resulted in elevated catalase and soluble protein levels in the seedlings, indicating that the extract induced stress and enhanced the stress resistance index. L-phenylalanine and 2-phenylethanol, substances present in the extract, were notably inhibitory to seed germination across all species, except for O. japonicus. Notably, 2-phenylethanol exhibited a stronger allelopathic effect than L-phenylalanine. Allelopathy synthetical effect evaluation showed that high concentration of aqueous extract allelopathic inhibition effect on seed germination of four plant species, but allelopathic promotion effect on physiological and biochemical growth of Taraxacum mongolicum, Senecio scandens and Viola philippica. In summary, the study demonstrates that bryophytes exert allelopathic effects on neighboring spontaneous plants, with the degree of influence varying among species. This suggests that the germination and growth of spontaneous plant seeds may be selective in bryophyte-dominated habitats and that the density of bryophytes could shape the evolution of these landscapes.
摘要：
自发植物景观是城市环境发展的重点。虽然许多自发植物可以与苔藓植物共存，创造出吸引人的荒野景观，苔藓植物对邻近自发植物生长的潜在化感作用仍不确定。本研究通过分析种子萌发，评估了刺槐水提物对城市流行自发植物萌发和幼苗生长的化感作用。幼苗生长形态，和相关指数。我们还研究了提取物中主要化合物对种子萌发的化感潜力。我们的发现表明，水提取物显着阻碍了麦冬种子的萌发，蒲公英,还有Violaphilipica,抑制水平与浓度呈正相关。相比之下,千里光种子萌发表现出浓度依赖性反应，低浓度促进和高浓度阻碍发芽。提取物持续减少了所有四个物种的根长，但它似乎增加了根的活力。在5g/L的浓度下，O.japonicus和V.philipica幼苗的叶绿素含量达到最大值，并随着提取物浓度的升高而降低。处理导致幼苗中过氧化氢酶和可溶性蛋白质水平升高，表明提取物诱导了应激，提高了抗应激指数。L-苯丙氨酸和2-苯乙醇，提取物中存在的物质，对所有物种的种子萌发都有明显的抑制作用，除了日本人.值得注意的是,2-苯乙醇表现出比L-苯丙氨酸更强的化感作用。化感作用综合效果评价表明,高浓度水提液对4种植物种子萌发具有明显的抑制作用,但对蒲公英生理生化生长的促感作用,塞内西奥·斯堪的斯和菲律宾中提琴。总之,研究表明苔藓植物对邻近的自发植物具有化感作用，不同物种的影响程度不同。这表明，在苔藓植物为主的栖息地中，自发植物种子的萌发和生长可能是选择性的，苔藓植物的密度可能会影响这些景观的演变。
