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首页> 外文期刊>Aquatic Biology >Growth and membrane permeability of two submersed macrophytes in response to ammonium enrichment
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Growth and membrane permeability of two submersed macrophytes in response to ammonium enrichment

机译：铵盐富集对两种沉水植物的生长和膜通透性的影响

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Increased ammonium (NH_4~+) concentrations are reported to be an important cause of decline in submersed macrophytes in eutrophic lakes. In this study, a subacute experiment was conducted to examine the effects of various NH_4~+ concentrations on growth and membrane permeability of 2 submersed macrophytes, Myriophyllum spicatum and Ceratophyllum demersum. Apical shoots of the plants were incubated in modified Hoagland solution with 0.25, 0.5, 1, 2, 4, 8, 16, 32, 64 and 128 mg l~(-1) NH_4~+-N for 4 d.The plants were then collected for examination of cell membrane permeability and the solutions were used to determine the concentrations of NH_4~+, sodium (Na~+), potassium (K~+), magnesium (Mg~(2+)) and calcium (Ca~(2+)). The results indicate that highNH_4~+ concentrations had significant adverse effects (e.g. reduced growth and leaf chlorosis) on the macrophytes and increased membrane permeability, leading to net leakage of NH_4~+ and the cations. Compared to M. spicatum, C. demersum had higher membrane permeability, which might enhance NH_4~+ transportation across the membrane and thus increase its tolerance to NH_4~+ stress. Significant increases in the membrane permeability of M. spicatum and C. demersum were observed in the treatments with external NH_4~+-N concentrations of >2 mg l~(-1), which fall within the range of NH_4~+ concentrations in many eutrophic lakes.
机译：铵（NH_4〜+）浓度升高据报道是富营养化湖泊中沉没大型植物下降的重要原因。在这项研究中，进行了一个亚急性实验，以研究各种NH_4〜+浓度对2种沉水大型植物Myriophyllum spicatum和Ceratophyllum demersum的生长和膜通透性的影响。将植物的顶芽在改良的Hoagland溶液中与0.25、0.5、1、2、4、8、16、32、64和128 mg l〜（-1）NH_4〜+ -N孵育4 d。然后收集以检查细胞膜通透性，并用溶液测定NH_4〜+，钠（Na〜+），钾（K〜+），镁（Mg〜（2+））和钙（Ca〜 （2+））。结果表明，高浓度的NH_4〜+对大型植物有明显的不利影响（例如，生长减少和叶绿化）和膜通透性增加，导致NH_4〜+和阳离子的净泄漏。与角叉螺相比，C。demersum具有更高的膜渗透性，这可能会增强NH_4〜+跨膜的运输，从而提高其对NH_4〜+胁迫的耐受性。在外部NH_4〜+ -N浓度> 2 mg l〜（-1）的处理中，观察到了M. spicatum和C. demersum的膜通透性显着增加，在许多情况下都在NH_4〜+浓度范围内富营养化的湖泊。

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