Scholarlink

<p><i>Alternanthera philoxeroides</i> is an aquatic macrophyte native to South America that colonizes aquatic and humid habitats due to its high phenotypic plasticity. This study evaluated the growth of <i>A. philoxeroides</i> under two shading conditions and nutrient concentrations in its native range in South America. We collected specimens from the upper Paraná River floodplain (Brazil). The propagules (stem fragments) were planted and subjected to four treatments: (i) with nutrient addition and shading; (ii) without nutrient addition and without shading; (iii) with nutrient addition and without shading; (iv) without nutrient addition and with shading. After growing, we measured dry biomass, shoot and root length, and the number of branches. Biomass and relative growth rates were higher in the absence of shade and with the addition of nutrients. The shoots grew more with nutrient addition, while the roots grew more without shading. Branches developed only in the treatment with nutrients and no shading. However, nutrients alone were not sufficient to counteract the negative effect of shading on plant growth. These results indicate that <i>A. philoxeroides</i> thrives and has a greater potential to spread (through branch formation, which serves as an indicator of propagule pressure) in eutrophic and well-lit environments. In contrast, moderate shading significantly reduces plant growth and spread (via branching), even under eutrophic conditions.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Nutrient enrichment in the sediment does not mitigate the shading stress on Alternanthera philoxeroides in its native habitat

  • 期刊论文

  • 发表日期：

    2025年6月10日

查看全文
  • Rafaela dos Santos Machado,
  • Aline Rosado,
  • Danielle Katharine Petsch,
  • Sidinei Magela Thomaz

摘要

Alternanthera philoxeroides is an aquatic macrophyte native to South America that colonizes aquatic and humid habitats due to its high phenotypic plasticity. This study evaluated the growth of A. philoxeroides under two shading conditions and nutrient concentrations in its native range in South America. We collected specimens from the upper Paraná River floodplain (Brazil). The propagules (stem fragments) were planted and subjected to four treatments: (i) with nutrient addition and shading; (ii) without nutrient addition and without shading; (iii) with nutrient addition and without shading; (iv) without nutrient addition and with shading. After growing, we measured dry biomass, shoot and root length, and the number of branches. Biomass and relative growth rates were higher in the absence of shade and with the addition of nutrients. The shoots grew more with nutrient addition, while the roots grew more without shading. Branches developed only in the treatment with nutrients and no shading. However, nutrients alone were not sufficient to counteract the negative effect of shading on plant growth. These results indicate that A. philoxeroides thrives and has a greater potential to spread (through branch formation, which serves as an indicator of propagule pressure) in eutrophic and well-lit environments. In contrast, moderate shading significantly reduces plant growth and spread (via branching), even under eutrophic conditions.