Clonal integration facilitates invasiveness of the alien aquatic plant Myriophyllum aquaticum L. under heterogeneous water availability
Clonal integration facilitates invasiveness of the alien aquatic plant Myriophyllum aquaticum L. under heterogeneous water availability
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DOI：
10.1007/s10750-013-1596-4
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发表时间：
2013-06
期刊：
影响因子：
2.6
通讯作者：
Wenhua You;Dan Yu;Chuhua Liu;D. Xie;W. Xiong
中科院分区：
文献类型：
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作者：
Wenhua You;Dan Yu;Chuhua Liu;D. Xie;W. Xiong
克隆植物通过克隆整合在相互连接的分株间进行资源转移，从而在普遍存在的异质生境中定居，这可能有助于外来克隆植物的入侵。为了验证这一假设，进行了温室实验，以探讨克隆整合的影响，非本地克隆植物，狐尾藻，受到时空异质性的供水。子分株生长与匍匐茎连接切断或连接到母株，并进行不同的数量或频率的供水。克隆整合显著提高了水分供应时空异质性条件下子分株的生长和光合性能。水分供应改变了分株根系生物量分配，提高了分株的吸水能力。通过匍匐茎连接，可以大大缓解光系统II最大量子产率（Fv/Fm）随供水量减少而降低的现象。此外，克隆整合促进叶片N浓度和C/N比的稳定，以支持分株的健康生长。这些结果表明，克隆整合可能有助于M.水生植物在不断变化的环境下受到资源供应的异质性。
Clonal plants benefit from the ability to translocate resources among interconnected ramets through clonal integration to colonise ubiquitous heterogeneous habitats, which may contribute to the invasiveness of exotic clonal plants. To test this hypothesis, a greenhouse experiment was conducted to investigate the effects of clonal integration on a non-native clonal plant, Myriophyllum aquaticum, subjected to spatial and temporal heterogeneity of water supply. The daughter ramets were grown with stolon connections either severed from or connected to the mother plant and subjected to different amounts or frequencies of water supply. Clonal integration significantly improved growth and photosynthetic performance of daughter ramets that were exposed to spatial and temporal heterogeneity of water supply. Biomass allocation to roots of offspring ramets changed with water supply to enhance the capacity for water uptake. The decrease of the maximum quantum yield of photosystem II (Fv/Fm) as a function of reduced water supply was greatly alleviated by stolon connection. Moreover, clonal integration facilitated stabilisation of foliar N concentration and C/N ratio to support healthy growth of the ramets. These results suggest that clonal integration may facilitate invasion of M. aquaticum when subjected to heterogeneity in resource supply under ever-changing environments.