Ismail Lamiaa M, Soliman Magda I, Abd El-Aziz Mohammed H, Abdel-Aziz Heba M M
Botany Department, Faculty of Science, Mansoura University, Mansoura 35516, Egypt.
Department of Genetics, Faculty of Agriculture, Mansoura University, Mansoura 35516, Egypt.
Plants (Basel). 2022 Feb 11;11(4):494. doi: 10.3390/plants11040494.
The present study was conducted to evaluate the effects of silicon (Si) and nano-silicon (NSi) on growth, yield, ions content, and antioxidant defense systems, including transcript levels of enzyme-encoding genes in plants grown under salinity stress. Both Si and NSi were applied at the 3 mM level and NaCl was applied at 4 concentrations (100, 150, 200 and 250 mM). Vegetative growth, including plant height, leaf area, fresh and dry weights, and yield attributes were determined. Gene expression of antioxidant enzymes was analyzed, and their activities were determined. The results showed that salinity had deleterious effects on plant growth and yield. Salt-stressed plant leaves exhibited a greater activity of superoxide dismutase (SOD), peroxidase (POD), but a lower activity of catalase (CAT) when compared to the control. Na ions accumulated in roots and shoots of salinized plants. The application of Si and NSi significantly enhanced vegetative growth and relative water content (RWC), and caused significant increases in plant height, fresh and dry weight, total yield, and antioxidant defense systems. Si and NSi enhanced K content in roots and shoots under salinity treatment and decreased Na content in the studied tissues. It was concluded that the application of NSi was beneficial in improving the salt tolerance of plants more than Si alone.
本研究旨在评估硅（Si）和纳米硅（NSi）对盐胁迫下生长的植物的生长、产量、离子含量和抗氧化防御系统（包括酶编码基因的转录水平）的影响。Si和NSi均以3 mM的水平施用，NaCl以4种浓度（100、150、200和250 mM）施用。测定了包括株高、叶面积、鲜重和干重在内的营养生长以及产量属性。分析了抗氧化酶的基因表达，并测定了它们的活性。结果表明，盐胁迫对植物生长和产量具有有害影响。与对照相比，盐胁迫下植物叶片的超氧化物歧化酶（SOD）、过氧化物酶（POD）活性更高，但过氧化氢酶（CAT）活性更低。Na离子在盐渍化植物的根和地上部积累。Si和NSi的施用显著促进了营养生长和相对含水量（RWC），并使株高、鲜重和干重、总产量以及抗氧化防御系统显著增加。在盐胁迫处理下，Si和NSi提高了根和地上部的K含量，并降低了所研究组织中的Na含量。得出的结论是，与单独施用Si相比，施用NSi更有利于提高植物的耐盐性。
