The ameliorative effect of silicon on soybean seedlings grown in potassium-deficient medium
The ameliorative effect of silicon on soybean seedlings grown in potassium-deficient medium
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DOI：
10.1093/aob/mcq063
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发表时间：
2010-06-01
期刊：
影响因子：
4.2
通讯作者：
Zhang, Wen-Hao
中科院分区：
文献类型：
--
作者：
Miao, Bao-He;Han, Xing-Guo;Zhang, Wen-Hao
当土壤中钾 (K) 缺乏时，作物产量和营养品质会显着降低。作为对植物有益的元素，硅（Si）可有效减轻矿物营养素的毒性作用。然而，硅在介导一般必需矿质营养素和特别是钾的缺乏中所起的作用尚未得到研究。 为了评估硅在缺钾诱导的大豆（Glycine max）幼苗生长抑制中的作用，缺钾对芽和根生长、过氧化氢积累、钾含量、脂质过氧化和抗氧化酶活性的影响。 研究了 2 mm 硅酸钠 (Na2SiO3) 的存在情况。与在 K 充足的培养基 (5 mm) 中生长相比，在缺钾培养基 (1 mm K) 中生长的大豆幼苗的地上部和根生物量均显着降低。添加 Na2SiO3 显着改善了缺钾引起的芽和根生长的减少。硅酸钠使缺钾幼苗的叶、茎和根中的钾浓度分别提高了105中心点4、83中心点4和58中心点8%。当大豆幼苗暴露于缺钾培养基时，过氧化氢 (H2O2) 和丙二醛 (MDA) 含量分别增加 25% 和 97%。通过添加 Na2SiO3 可以消除 H2O2 和 MDA 积累的增加。添加Na2SiO3可降低缺钾引起的超氧化物歧化酶、过氧化氢酶和过氧化物酶活性的增加。在缺钾培养基中生长的大豆幼苗中施用硅可显着提高钾的利用效率。因此，硅不仅可以提高植物对养分毒性的耐受性，而且可以改善与植物必需养分缺乏相关的症状。
Crop yield and nutritional quality are significantly reduced when potassium (K) in soil is deficient. As a beneficial element for plants, silicon (Si) is effective in alleviating the toxic effects of mineral nutrients. However, the roles played by Si in mediating deficiency in essential mineral nutrients in general and K in particular have not been investigated.To evaluate the role of Si in K deficiency-induced inhibition of growth of soybean (Glycine max) seedlings, the effects of K deficiency on shoot and root growth, hydrogen peroxide accumulation, K contents, lipid peroxidation and activities of antioxidant enzymes in the absence and presence of 2 mm sodium silicate (Na2SiO3) were investigated.Both shoot and root biomass of soybean seedlings were markedly reduced when grown in K-deficient medium (1 mm K) compared with those grown in K-sufficient medium (5 mm). Addition of Na2SiO3 significantly ameliorated the K deficiency-induced reductions in shoot and root growth. Sodium silicate enhanced K concentrations in leaf, stem and root of K-deficient seedlings by 105 center dot 4, 83 center dot 4 and 58 center dot 8 %, respectively. Hydrogen peroxide (H2O2) and malondialdehyde (MDA) contents in soybean seedlings were increased by 25 and 97 %, respectively, when exposed to K-deficient medium. These increases in accumulation of H2O2 and MDA were removed by addition of Na2SiO3. Addition of Na2SiO3 reduced the K deficiency-induced increases in activities of superoxide dismutase, catalase and peroxidase.Application of Si to soybean seedlings grown in K-deficient medium markedly enhanced K use efficiency. Therefore, Si not only increases tolerance to nutrient toxicity, but also ameliorates symptoms associated with deficiency in essential nutrients in plants.