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Potential for introduced-range expansion of Chinese tallow tree (Triadica sebifera) in the southeastern United States.

机译：在美国东南部，中国牛脂树（Triadica sebifera）的引种范围扩大的潜力。

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摘要

The potential for populations of invasive plants to differ in their response to stressful environmental conditions or in their invasiveness is an underexplored issue in determining introduced species' range limits. Introduced genotypes might differ in their response to freezing temperatures, soil type, or differing biotic factors within their introduced range. We examined the potential of Chinese tallow tree seeds (Triadica sebifera (L.) Small) collected from two genetically distinct areas of its introduced range in the United States (North Carolina and South Carolina) as well as from the northern and southern portions of its native range in China to germinate and for seedlings to survive winter conditions inland of the species' current coastal distribution in the state of South Carolina. Germination success of seeds from these four source populations was compared between fall plantings that mimic natural dispersal timing and spring plantings after the last frost in areas within (coastal sites) and inland (midland and piedmont areas) of its current distribution in South Carolina. In separate studies, overwinter survival, stem damage, budbreak timing and response to freeze events occurring before and after budbreak were compared among seedlings of the four source populations. Overall, seed germination success was lower in the colder piedmont areas than the warmer coastal sites, and seeds and seedlings from South Carolina genotypes showed greater reduction in germination success by inland winters, greater winter damage and reduced budbreak success in the field, and lower survival after prolonged freeze events than genotypes from North Carolina or China. These results show that genetically determined differences in environmental constraints exist among introduced genotypes of Chinese tallow, and that the North Carolina genotype shows greater potential for inland expansion than the South Carolina one. These population differences must be taken into account when evaluating the potential range expansion of Chinese tallow.
机译：在确定引入物种的范围限制时，入侵植物种群对压力环境条件的反应或入侵能力可能不同。引入的基因型对冷冻温度，土壤类型或在引入范围内的不同生物因子的反应可能有所不同。我们研究了从美国（北卡罗来纳州和南卡罗来纳州）其引进范围的两个遗传上不同的地区以及其北部和南部部分收集的中国牛油树种子（Triadica sebifera（L.）Small）的潜力。该物种目前在南卡罗来纳州沿海分布的内陆地区，将在中国的本地范围内发芽并使其幼苗能够越冬。比较了这四个来源种群的种子发芽成功与模拟自然扩散时间的秋季播种以及南卡罗来纳州目前分布的沿海地区（内陆地区）和内陆地区（中部和皮埃蒙特地区）的最后一次霜冻之后的春季播种。在单独的研究中，比较了四个来源种群的幼苗的越冬存活率，茎损伤，萌芽时机和对萌芽前后发生的冻结事件的响应。总体而言，较冷的山麓地区的种子发芽成功率低于较温暖的沿海地区，并且来自南卡罗来纳州基因型的种子和幼苗显示内陆冬季发芽成功率下降幅度更大，冬季损害更大，田间芽破成功率降低，存活率较低长时间的冷冻事件后，其遗传比北卡罗来纳州或中国的基因型高。这些结果表明，在遗传上确定的环境限制的差异存在于所引入的中国牛脂基因型之间，并且北卡罗莱纳州的基因型比南卡罗莱纳州的基因型具有更大的内陆扩展潜力。在评估牛脂的潜在范围扩展时，必须考虑这些人口差异。

著录项

  • 作者

    Park, Isaac.;

  • 作者单位

    Clemson University.;

  • 授予单位 Clemson University.;
  • 学科 Agriculture Plant Culture.;Biology Plant Physiology.
  • 学位 M.S.
  • 年度 2009
  • 页码 46 p.
  • 总页数 46
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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