Impact of environmental factors on seed germination and seedling emergence of the invasive plant Acmella radicans
文献类型： 外文期刊
作者： Wu, Xiaohan 1 ; Yang, Kexin 1 ; Zheng, Fengping 1 ; Yang, Yunhai 1 ; Xu, Gaofeng 1 ; Clements, David Roy 4 ; Yang, Shaosong 1 ; Yao, Bin 1 ; Jin, Guimei 1 ; Shen, Shicai 1 ; Zhang, Fudou 1 ; Day, Michael Denny 6 ;
作者机构： 1.Yunnan Acad Agr Sci, Agr Environm & Resource Res Inst, Key Lab Prevent & Control Biol Invas, Minist Agr & Rural Affairs China, Kunming 650205, Peoples R China
2.Yunnan Acad Agr Sci, Agr Environm & Resource Res Inst, Key Lab Green Prevent & Control Agr Transboundary, Kunming 650205, Peoples R China
3.Yunnan Acad Agr Sci, Agr Environm & Resource Res Inst, Yunnan Lancang Mekong Agr Biosecur Int Sci & Techn, Kunming 650205, Peoples R China
4.Trinity Western Univ, Dept Biol, Langley, BC V2Y1Y1, Canada
5.Yunnan Univ, Sch Agr, Kunming 650504, Peoples R China
6.Dept Primary Ind, GPO Box 267, Brisbane, Qld 4001, Australia
关键词： Invasive plant species; Light intensity; Seed biology; Temperature
期刊名称：PLANT ECOLOGY （ 影响因子：1.7； 五年影响因子：1.8 ）
ISSN： 1385-0237
年卷期： 2025 年 226 卷 8 期
页码：
收录情况： SCI
摘要： Acmella radicans (Jacq.) R.K.Jansen (Asteraceae) is a widespread and troublesome weed in Yunnan Province, China and information about its seed germination biology is scant. A series of experiments were conducted to explore the effects of various environmental factors (temperature, light, pH, NaCl, soil water content, and burial depth) on germination and seedling emergence of A. radicans under controlled conditions. The optimum temperature for maximum germination (85.0%) and index (9.44) was between 25 and 30 degrees C. Compared with constant temperatures, all germination values of A. radicans were markedly reduced by the same mean alternating temperatures. Seeds of A. radicans were positively photoblastic, and seed germination under full light and dark conditions averaged 78.3% and 1.7% respectively. Seed germination (> 80.0%) was unaffected by pH levels ranging from 4 to 10. The highest germination (83.3%) and lowest germination (27.5%) occurred at 40 and 160 mM NaCl concentrations respectively. Seeds on the soil surface had the highest germination percentage (84.2%), while no seed germinated at soil depths >= 3 cm. Seed germination gradually increased with increasing soil water content up to 80% and was then reduced with increasing soil water content up to 100%. All these results show that A. radicans has a strong ability to germinate under a broad range of environmental conditions. The knowledge obtained in this study will be useful to develop better management strategies for reducing germination and seedling emergence of A. radicans in areas where it can rapidly colonize.
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