Institute of Chemistry, Centre of Glycomics, Slovak Academy of Sciences, Dúbravská cesta 9, 845 38, Bratislava, Slovakia.
Environ Sci Pollut Res Int. 2018 Aug;25(22):22318-22322. doi: 10.1007/s11356-018-2602-1. Epub 2018 Jul 4.
The composition of shoot cell walls of two maize hybrids (Zea mays L.), the sensitive Novania and the tolerant Almansa, both after cadmium treatment was studied. Previous results showed a smaller effect of cadmium on shoot physiological parameters (e.g., elongation, dry mass, photosynthetic pigments content) in both hybrids compared to their roots. Changes in the composition of shoot cell walls were observed. It was ascertained that the amount of hemicelluloses in shoot cell walls decreased and the amount of lignocellulose complex increased in the sensitive hybrid; the opposite was observed in the tolerant Almansa. Dissimilarities in the cell wall structure of shoots, compared to the roots, in both hybrids were observed mainly in higher quantities of total lignin, in hemicelluloses fractions. The lignocellulose complex remained unchanged in the shoots in comparison to the roots. Nevertheless, in both hybrids, the highest Cd amount was found in hemicelluloses. Such modification of the cell walls might affect the amount of binding sites resulting in lower cell wall permeability and subsequently in a lower pollutant influx into the protoplast.
研究了两种玉米杂种（玉米 L.）的芽细胞壁组成，即敏感的 Novania 和耐 Almans，两者均经镉处理。先前的结果表明，与根部相比，镉对芽生理参数（如伸长、干质量、光合色素含量）的影响较小。观察到芽细胞壁组成的变化。确定在敏感杂种中，芽细胞壁中的半纤维素含量减少，木质纤维素复合物的含量增加；而在耐 Almans 中则相反。与根部相比，两种杂种的芽细胞壁结构的差异主要表现在总木质素和半纤维素分数中更高的含量。与根部相比，木质纤维素复合物在芽中保持不变。然而，在两种杂种中，半纤维素中发现的 Cd 量最高。细胞壁的这种修饰可能会影响结合位点的数量，从而导致细胞壁渗透率降低，随后污染物进入原生质体的量减少。
