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首页> 外文期刊>Journal of plant nutrition and soil science >High monosilicic acid supply rapidly increases Na accumulation in maize roots by decreasing external Ca2+ activity
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High monosilicic acid supply rapidly increases Na accumulation in maize roots by decreasing external Ca2+ activity

机译：通过降低外部Ca2 +活性，高单硅酸供应迅速增加玉米根部的Na积累

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Both calcium (Ca2+) and silicon (Si) improve plant performance under salt (NaCl) stress. Although these two mineral elements share numerous similarities, the information on how their extracellular interactions in the root apoplast affect uptake of sodium (Na+) is still lacking. Here, we investigated the effect of high Si supply in the bioavailable form of monosilicic acid (H4SiO4) on the activity of Ca2+ in the external root solution, and subsequent root uptake and compartmentation of Na in maize (Zea mays L.). In the short-term experiments (6 h), 14-d-old maize plants were exposed to various concentrations of Ca2+ at three different pH-values (6.5, 7.5, and 8.5) and two Si concentrations, i.e., low (1 mM) and high (4 mM) supply of H4SiO4. The activity of Ca2+ and Na+ in the external solution as well as the root concentrations of total and cell sap and BaCl2-exchangeble apoplastic fractions of both elements were analyzed. The pH of the nutrient solution affected neither the ion activities nor the root accumulation of both Ca2+ and Na+. At higher pH values (7.5 and 8.5) the interactions of Ca2+ and Si at high Si supply led to a decrease of Ca2+ activity and, hence, an increase of Na+ : Ca2+ activity ratio in the external root solution. Concomitantly, despite the elevated exchangeable apoplastic fraction of both Ca2+ and Na+, the total and cell sap concentrations were remarkably decreased for Ca2+ and increased for Na+ by the addition of 4 mM H4SiO4. This work demonstrates that at high Si supply extracellular Ca-Si interactions leading to lowered activity of Ca2+ might rapidly compromise the ameliorative effect of Ca2+ on Na+ accumulation in roots. Practically, Si over-fertilization of saline and, in particular, sodic soils may further promote the accumulation of Na+ in root tissues hours after Si application and, hence, increase a potential risk of Na+ toxicity.
机译：钙（Ca2 +）和硅（Si）都改善了盐（NaCl）胁迫下的植物性能。虽然这两种矿物质份额含有许多相似之处，但仍然缺乏关于其根部血晶体内的细胞外相互作用的信息仍然缺乏。在这里，我们研究了高Si供应在外根溶液中Ca2 +的活性的生物可利用形式的单硅酸（H4SiO4）的影响，以及随后的玉米中Na的根吸收和分隔率（Zea mays L.）。在短期实验（6小时）中，在三种不同pH值（6.5,7.5和8.5）和两个Si浓度下暴露于各种浓度的Ca2 +的14-D型玉米植物，即低（1mm ）H4SIO4的高（4毫米）供应。分析了外部溶液中Ca2 +和Na +的活性以及两种元素的总和细胞SAP的根浓度和细胞SAP和BaCl2-掺杂膜板塑料级分。营养液的pH既不影响离子活动也不影响Ca2 +和Na +的根部积累。在较高的pH值（7.5和8.5）处Ca2 +和Si的相互作用在高Si电源下导致Ca2 +活性的降低，因此，外根溶液中的Na +：Ca2 +活性比的增加。同时，尽管Ca2 +和Na +的可交换妊娠率分数升高，但Ca2 +的总和细胞Sap浓度显着降低，并通过加入4mM H 4 SiO 4而增加Na +。这项工作表明，在高Si供应外细胞外CA-Si相互作用，导致Ca2 +降低的活动可能会迅速损害Ca2 +在根中Na +积累的改进作用。实际上，Si对盐水的过度施肥，特别是Sodic土壤可以进一步促进Si应用后的根组织中Na +的积累，因此增加了Na +毒性的潜在风险。

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