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首页> 外文期刊>Acta Physiologiae Plantarum >Subcellular distribution and chemical forms of Co2+ in three barley genotypes under different Co2+ levels
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Subcellular distribution and chemical forms of Co2+ in three barley genotypes under different Co2+ levels

机译：不同Co2+水平下3种大麦基因型中Co2+的亚细胞分布和化学形式

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摘要

The toxicity of many heavy metals in plants is closely associated with its subcellular distribution and chemical forms. The subcellular distribution and chemical forms of cobalt (Co2+) were investigated using 3 barley genotypes differing in Co2+ toxicity resistance, namely Yan66 (resistant), Ea 52 (sensitive), and Humai 4 (moderate), under two Co2+ levels (25 and 100 lM). Higher Co2+ level in cultural solution significantly increased Co2+ accumulation in all subcellular fractions, with vacuole and cell wall having higher concentration. In comparison with 25 lM Co2+, 100 mu M Co2+ treatment caused significant increase of Co2+ concentration in the forms of F-NaCl (extracted with 1 M NaCl), F-Ac (extracted with 2 HAc), F-HCl (extracted by 0.6 M HCl), and F-residue (residue forms) in both shoots and roots. There was a significant difference among genotypes in Co2+ subcellular distribution and chemical forms, with Ea52 accumulating more Co2+ in organelles and Yan66 accumulating more Co2+ in vacuole and cell wall. Moreover, the inorganic form of Co2+ extracted with 80 ethanol (F-ethanol) and watersoluble form (F-H2O) were significantly increased in Ea52, while Yan66 accumulated more Co2+ in the forms of lowbioavailable molecules (F-NaCl, F-HAc, and F-HCl). The results suggest that the vacuolar sequestration and cell wall deposition of Co2+ is a key resistant mechanism for genotype Yan66.
机译：许多重金属在植物中的毒性与其亚细胞分布和化学形式密切相关。在两种Co2+水平（25和100 lM）下，使用3种不同Co2+毒性抗性的大麦基因型，即Yan66（抗性）、Ea 52（敏感性）和Humai 4（中度）研究了钴（Co2+）的亚细胞分布和化学形式。培养液中较高的 Co2+ 水平显着增加了所有亚细胞组分中 CO2+ 的积累，液泡和细胞壁的浓度较高。与25 lM Co2+相比，100 μ M Co2+处理导致地上部和根部的F-NaCl（1 M NaCl萃取）、F-Ac（2% HAc萃取）、F-HCl（0.6 M HCl萃取）和F-残渣（残渣形式）形式的Co2+浓度显著增加。Co2+亚细胞分布和化学形态的基因型之间存在显著差异，Ea52在细胞器中积累更多的Co2+，Yan66在液泡和细胞壁中积累更多的Co2+。此外，80%乙醇（F-乙醇）和水溶性（F-H2O）提取的无机形式的Co2+在Ea52中显著增加，而Yan66以低生物利用度分子（F-NaCl、F-HAc和F-HCl）的形式积累了更多的Co2+。结果表明，Co2+的液泡隔离和细胞壁沉积是基因型Yan66的关键抗性机制。

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