Morphological responses of a submerged macrophyte to epiphyton
Morphological responses of a submerged macrophyte to epiphyton
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DOI：
10.1007/s10452-009-9291-2
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发表时间：
2010-03
期刊：
影响因子：
1.8
通讯作者：
Munira Sultana;T. Asaeda;M. Ekram Azim;T. Fujino
中科院分区：
文献类型：
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作者：
Munira Sultana;T. Asaeda;M. Ekram Azim;T. Fujino
附生植物可能对底生植物的形态有明显的影响。在两种光照强度下，研究了附生植物对底物沉水植物perfoliatuspotamogeton形态特征的影响。在实验室条件下，在12个玻璃水族箱中进行为期84天的实验。试验采用2 × 2因子设计，考虑附生菌状态（存在或不存在）和光照强度（200或80 μE m−2s−1）。附生植物和光照强度对实验植物的形态和生物量分配均有显著影响。在弱光条件下，无附生菌对照植株的平均叶片数、新梢总长度和茎粗均大于附生菌定殖植株。在两种光强下，附生植物在根茎和根系中分配的生物量（占总生物量的百分比）均高于对照植物。也有显著的附生-光相互作用。弱光胁迫下对照植株的主芽节间伸长高于强光胁迫下对照植株的节间伸长。而附生植物则没有表现出这种适应性。对照植株在弱光条件下新芽未表现出主芽节间伸长的现象。附生高光强对照植株的主芽叶长度大于附生弱光强对照植株，而新芽中不存在这种差异。我们认为，附生植物的长期定殖及其遮荫作用导致了植物形态的变化。
Epiphyton might have distinctive influence on the morphology of substrate macrophyte. In this article, we evaluate the influence of epiphyton on the morphological characteristics of their substrate submerged macrophyte,Potamogeton perfoliatusunder two light intensities. The experiment was carried out for a period of 84 days in 12 glass aquaria under laboratory conditions. It was based on a 2 × 2 factorial design with epiphyton status (present or absent) and light intensity (200 or 80 μE m−2s−1). Both epiphyton and light intensity had significant effects on the morphology and biomass allocation of the experimental plants. The average number of leaves, total length of newly recruited shoots and diameter of stems were greater in the epiphyton-free control plants than in the epiphyton-colonized plants under low light conditions. The plants with epiphyton allocated more biomass in their rhizomes and roots (% relative to total biomass basis) when compared to the control plants in both light intensities. There were also significant epiphyton–light interactions. The control plants under low light intensity showed higher internodal elongation in their main shoots when compared to the plants under high light intensity as an adaptation mechanism. Whereas the plants with epiphyton did not show such an adaptation. The new shoots of the control plants under low light intensity did not show any internodal elongation as observed in the main shoots. Furthermore, the length of the leaves of main shoots was larger in control plants with epiphyton and high light intensity than in plants with epiphyton and low light intensity, but such a variation was absent in the new shoots. We conclude that the long-term colonization by epiphyton and their shading effects induced the observed morphological changes in plants.