Effects of fragmentation of clones compound over vegetative generations in the floating plant Pistia stratiotes
Effects of fragmentation of clones compound over vegetative generations in the floating plant Pistia stratiotes
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克隆化合物片段化对浮水植物 Pistia stratiotes 营养世代的影响
DOI：
10.1093/aob/mcaa150
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发表时间：
2021-01-01
期刊：
影响因子：
4.2
通讯作者：
Yu, Fei-Hai
中科院分区：
文献类型：
--
作者：
Adomako, Michael Opoku;Alpert, Peter;Yu, Fei-Hai
背景和目的克隆植物在许多植物群落中占据主导地位，特别是在水生系统中，克隆似乎促进了入侵，并影响了多样性如何对干扰和资源可获得性做出反应。要了解克隆生长的特殊生理和形态特性如何导致这些生态效应，取决于研究克隆生长特性在营养世代之间的长期后果，但这方面的研究很少。本研究旨在揭示一个重要的克隆特性，即无性系内相连分株之间的生理整合，如何影响多个世代的水生入侵优势物种无性系对干扰和资源的反应。方法将漂浮的匍匐茎植物PistiaStratiotes的单个亲本分株培养3周，在此期间产生2~3代后代，新分株之间的连接被切断或保持完整。然后，在第二次为期3周的迭代中，将单个后代用作亲本，该迭代将碎片与第一次迭代中的先前碎片交叉。第三次迭代产生了八种治疗组合，在过去的不同时间出现了零到三轮的碎片化。结果在每次迭代中，片段化增加了亲本分株的生物量，降低了子代的生物量，增加了子代的数量。这些影响持续存在，并在一次又一次的迭代中复合，尽管最近的碎片化有更强的影响，并且在低营养水平比在高营养水平更强。碎片化对群体质量的净累积量在一次迭代后没有影响，但在低营养水平下重复两次和在两个营养水平下重复三次后增加。结论碎片化对克隆性能的正面和负面影响可以随着时间的推移而复合并持续存在，当资源水平较低时，这种影响可能会更强。即使碎片化对克隆性能没有短期的净影响，它也可以产生长期的影响。在某些情况下，碎片化可能会增加克隆的总质量积累。这些结果首次证明了克隆植物的生理整合如何影响世代间的适合度，并表明增加的干扰可能通过影响整合来促进引入的克隆物种的入侵，也许在较低的营养水平下尤其如此。
Background and Aims Clonal plants dominate many plant communities, especially in aquatic systems, and clonality appears to promote invasiveness and to affect how diversity changes in response to disturbance and resource availability. Understanding how the special physiological and morphological properties of clonal growth lead to these ecological effects depends upon studying the long-term consequences of clonal growth properties across vegetative generations, but this has rarely been done. This study aimed to show how a key clonal property, physiological integration between connected ramets within clones, affects the response of clones to disturbance and resources in an aquatic, invasive, dominant species across multiple generations.Methods Single, parental ramets of the floating stoloniferous plant Pistia stratiotes were grown for 3 weeks, during which they produced two or three generations of offspring; connections between new ramets were cut or left intact. Individual offspring were then used as parents in a second 3-week iteration that crossed fragmentation with previous fragmentation in the first iteration. A third iteration yielded eight treatment combinations, zero to three rounds of fragmentation at different times in the past. The experiment was run once at a high and once at a low level of nutrients.Results In each iteration, fragmentation increased biomass of the parental ramet, decreased biomass of the offspring and increased number of offspring. These effects persisted and compounded from one iteration to another, though more recent fragmentation had stronger effects, and were stronger at the low than at the high nutrient level. Fragmentation did not affect net accumulation of mass by groups after one iteration but increased it after two iterations at low nutrients, and after three iterations at both nutrient levels.Conclusions Both the positive and negative effects of fragmentation on clonal performance can compound and persist over time and can be stronger when resource levels are lower. Even when fragmentation has no short-term net effect on clonal performance, it can have a longer-term effect. In some cases, fragmentation may increase total accumulation of mass by a clone. The results provide the first demonstration of how physiological integration in clonal plants can affect fitness across generations and suggest that increased disturbance may promote invasion of introduced clonal species via effects on integration, perhaps especially at lower nutrient levels.