Institute of Chemistry, Centre of Glycomics, Slovak Academy of Sciences, Dúbravská cesta 9, 845 38, Bratislava, Slovakia.
Institute of Chemistry, Centre of Glycomics, Slovak Academy of Sciences, Dúbravská cesta 9, 845 38, Bratislava, Slovakia.
Plant Physiol Biochem. 2016 Nov;108:90-98. doi: 10.1016/j.plaphy.2016.06.035. Epub 2016 Jul 2.
Some physiological parameters and composition of the root cell walls of two maize hybrids (monocots), the sensitive Novania and the tolerant Almansa were studied after treatment with cadmium cations. After 10 days of Cd treatment (1 × 10 M and 5 × 10 M), plant growth inhibition, in the sensitive hybrid in particular, as well as a certain alteration in root structure and pigment content were observed. The Cd accumulation was ten times higher in the roots than in the shoots. Chemical analyses and atomic absorption spectroscopy proved that Cd modified the composition of the root cell walls by a significant increase in the content of alkali-soluble polysaccharide fractions, particularly in the tolerant hybrid. An increase in the content of phenolic compounds, mainly in the tolerant hybrid, and a decrease in protein content were observed in the presence of Cd in the alkali fractions. The results indicate that the changes in the cell wall polysaccharide fractions and their proportion to lignin and cellulose are obviously involved in the tolerance and/or defence against Cd of the maize hybrids studied.
研究了两种玉米杂种（单子叶植物），即敏感的 Novania 和耐性的 Almansa，在镉阳离子处理后一些生理参数和细胞壁成分的变化。经过 10 天的 Cd 处理（1×10^-5M 和 5×10^-5M），观察到敏感杂种特别是植物生长受到抑制，根结构和色素含量发生一定改变。与地上部分相比，根中 Cd 的积累量要高出 10 倍。化学分析和原子吸收光谱证明，Cd 通过显著增加碱溶性多糖部分的含量来改变根细胞壁的组成，特别是在耐性杂种中。在碱性部分存在 Cd 时，观察到酚类化合物含量增加，主要在耐性杂种中，以及蛋白质含量降低。结果表明，细胞壁多糖部分的变化及其与木质素和纤维素的比例明显参与了所研究的玉米杂种的 Cd 耐性和/或防御。
