Comparative analysis of growth and physiological traits between the natural hybrid Sphagneticola trilobata x calendulacea and its parental species
Comparative analysis of growth and physiological traits between the natural hybrid Sphagneticola trilobata x calendulacea and its parental species
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DOI：
10.1111/njb.00910
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发表时间：
2016-04-01
影响因子：
0.9
通讯作者：
Wang, Zhang-Ming
中科院分区：
文献类型：
--
作者：
Li, Ting;Huang, Li-Xin;Wang, Zhang-Ming
生物入侵是一个全球性的环境问题。杂交被认为是侵袭性进化的刺激因素。因此，在为新杂交种设计和实施管理策略之前，尤其是利用与性能相关的性状，评估它们的入侵潜力是至关重要的。比较入侵物种与非入侵物种的生长和生理特性是识别入侵性状和预测物种入侵潜力的有效途径。然而，很少有研究通过对这些性状的比较分析来评估新杂交种的入侵潜力。我们研究了最近证实的一种天然杂交物种的入侵潜力，该杂交物种是世界上入侵最严重的100个物种之一的入侵三叶草和它的本土同源金盏花科植物。我们通过一个普通的花园实验，比较了杂交种及其亲本对不同光照条件(开光、自然光；遮荫，自然光的25%)的生长和生理反应。然后，我们使用判别分析来确定入侵物种和非入侵物种之间最不同的生长和生理特征。研究发现，在开阔和遮荫环境中，三叶草的生长速率、光合作用能力和资源利用效率均高于金盏花草，且杂交种在这些性状上更接近三叶草。判别分析表明，在一些与性能相关的性状上，该杂交种更接近三叶草而不是金盏花科植物，而且在阴凉处的入侵潜力比在开阔环境中要小。这些结果表明，该杂交种具有很高的入侵潜力，在开阔和遮荫环境中都可以成为一种有效的入侵者。
Biological invasion is a global environmental issue. Hybridization is considered a stimulus for evolution of invasiveness. It is thus essential to evaluate the invasive potential of new hybrids before management strategies are designed and implemented for them, especially, using performance-related traits. Comparing growth and physiological traits between invasive species and their non-invasive congeners is an effective way to identify invasive traits and to predict the invasive potential of species. However, few studies have evaluated the invasive potential of new hybrids by comparative analysis of these traits. We examined the invasive potential of a recently confirmed natural hybrid between the invasive Sphagneticola trilobata, one of the 100 worst invasive species worldwide, and its indigenous congener S. calendulacea. We compared growth and physiological responses of the hybrid and its parental species to different light conditions (open, natural light; shade, 25% of natural light) by conducting a common garden experiment. We then used discriminant analysis to identify those growth and physiological traits that are most different between the invasive and the non-invasive species. We found that S. trilobata had a higher growth rate, photosynthetic capacity and resource use efficiency than S. calendulacea in both the open and the shade environments, and the hybrid was more similar to S. trilobata than to S. calendulacea in these traits. Discriminant analysis suggested that the hybrid is more similar to S. trilobata than to S. calendulacea for a number of traits associated with performance, and that the hybrids had less invasive potential in the shade than in the open environment. These results indicate that the hybrid has a high invasive potential and could be an efficient invader in both open and shade environments.