Growth, morphology, ammonium uptake and nutrient allocation of Myriophyllum brasiliense Cambess. under high NH4+ concentrations
Growth, morphology, ammonium uptake and nutrient allocation of Myriophyllum brasiliense Cambess. under high NH4+ concentrations
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DOI：
10.1007/s10646-011-0744-8
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发表时间：
2011-07
期刊：
影响因子：
2.7
通讯作者：
Piyanart Saunkaew;P. Wangpakapattanawong;A. Jampeetong
中科院分区：
文献类型：
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作者：
Piyanart Saunkaew;P. Wangpakapattanawong;A. Jampeetong
研究了水培条件下高浓度NH 4+对巴西狐尾藻生长、形态、NH 4+吸收和养分分配的影响。植物在温室条件下生长4周，使用四种水平的NH 4+浓度：1、5、10和15 mM. M。在NH 4+浓度高达5 mM时，巴西兰生长良好，相对生长速率为c.0.03 d-1。在较高的NH 4+浓度下，植物的生长受到阻碍，并且植物具有短根和很少的新芽，特别是当生长在15 mM NH 4+中时，其中沉水叶丢失，并且存在腐烂的根和沉水茎。为了避免NH 4+毒害，植物可能具有防止细胞质NH 4+在植物细胞中积累的机制。10和15 mM NH 4+处理的植株对NH 4+的净吸收量显著降低，而全氮量显著增加。植物可能利用NH 4+同化和排出作为补偿高NH 4+浓度的机制。当NH 4+浓度超过10 mM时，植株会出现缺素症状，尤其是缺钾症状。本研究为M.它可以生长在富含NH 4+的水中，浓度高达5 mM。
The effects of high NH4+concentration on growth, morphology, NH4+uptake and nutrient allocation ofMyriophyllum brasiliensewere investigated in hydroponic culture. The plants were grown under greenhouse conditions for 4 weeks using four levels of NH4+concentration: 1, 5, 10 and 15 mM.M. brasiliensegrew well with a relative growth rate ofc.0.03 day−1at NH4+concentration up to 5 mM. At the higher NH4+concentrations the growth of the plants was stunted and the plants had short roots and few new buds, especially when grown in 15 mM NH4+where the submerged leaves were lost and there were rotten roots and submerged stems. To avoid NH4+toxicity, the plants may have a mechanism to prevent cytoplasmic NH4+accumulation in plant cells. The net uptake of NH4+significantly decreased and the total N significantly increased in the plants treated with 10 and 15 mM NH4+, respectively. The plant may employ NH4+assimilation and extrusion as a mechanism to compensate for the high NH4+concentrations. However, the plants may show nutrient deficiency symptoms, especially K deficiency symptoms, after they were exposed to NH4+concentration higher than 10 mM. The present study provides a basic ecophysiology ofM. brasiliensethat it can grow in NH4+enriched water up to concentrations as high as 5 mM.