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The effects of foliar-applied manganese on major cell wall polysaccharide fractions and soluble sugar composition of cucumber leaves
Acta Physiologiae Plantarum ( IF 2.6 ) Pub Date : 2020-09-14 , DOI: 10.1007/s11738-020-03141-w
S. Eskandari , E. Gineau

Increasing evidence shows that micronutrients can induce changes in cell wall (CW) properties in plants. A detailed knowledge of these changes will contribute to understand the beneficial and detrimental impacts of trace elements on plant development and defence. In the present work, the influence of foliar spray of manganese (Mn) on the composition of CW polysaccharides and soluble sugars was investigated in cucumber leaves using spectrophotometric and chromatographic techniques. Cucumber seedlings were hydroponically cultured under controlled situations for 21 days. At the two-leaf stage, the above facade of cucumber leaves was fertilized with MnSO4 solutions at various dosages (1.8, 4.5 and 7.2 mM). Results showed that the foliar Mn spray decreased the galacturonic acid (GalA) content, while it increased the degree-of-methyl-esterification (DM) of pectin. The amounts of fucose, arabinose and galactose diminished upon Mn application. The contents of rhamnose and xylose decreased or did not change by Mn treatment. The glucose level enhanced at low concentration of Mn (1.8 mM), but it decreased at medium and high concentrations of Mn (4.5 and 7.2 mM). The increase of mannose content was significant only at medium concentration of Mn. Overall, the amount of total hemicellulose increased at 1.8 mM concentration of Mn, while a decrease was observed at 4.5 and 7.2 mM concentrations of Mn. The cellulose content decreased at low and high concentrations of Mn, although it remained unchanged at medium concentration of Mn. Generally, the total contents of CW polysaccharides increased at low concentration of Mn, but they decreased at the higher concentrations of Mn. Such changes can be important in plant resistance to environmental stresses via reduction of permeability against fungal pathogens and decrease of water loss from tissues under stresses such as drought and salinity.



中文翻译:

叶面施用锰对黄瓜叶片主要细胞壁多糖组分和可溶性糖组成的影响

越来越多的证据表明,微量营养素可以诱导植物细胞壁(CW)特性的变化。对这些变化的详细了解将有助于理解微量元素对植物发育和防御的有益和有害影响。在本工作中,使用分光光度法和色谱技术研究了叶面喷洒锰(Mn)对黄瓜叶片中CW多糖和可溶性糖组成的影响。在受控情况下将黄瓜幼苗水培培养21天。在两叶阶段,将黄瓜叶的上述门面用MnSO 4施肥。各种剂量(1.8、4.5和7.2 mM)的溶液。结果表明,叶面喷洒的Mn降低了半乳糖醛酸(GalA)的含量,同时增加了果胶的甲基酯化度(DM)。施用锰后岩藻糖,阿拉伯糖和半乳糖的量减少。锰处理使鼠李糖和木糖含量降低或没有变化。葡萄糖浓度在低浓度的Mn(1.8 mM)时增加,但在中等浓度和高浓度的Mn(4.5和7.2 mM)时降低。甘露糖含量的增加仅在中等浓度的Mn下才有意义。总体而言,总的半纤维素的量在Mn浓度为1.8 mM时增加,而在Mn浓度为4.5和7.2 mM时减少。锰含量低和高时纤维素含量降低,尽管在中等浓度的Mn下保持不变。通常,CW多糖的总含量在低浓度的Mn时增加,但在较高浓度的Mn时降低。通过降低针对真菌病原体的通透性并减少干旱和盐分等胁迫下组织的水分流失,此类变化对于植物对环境胁迫的抗性可能很重要。

更新日期:2020-09-14
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