碱胁迫下硅促进冰草种子萌发

以塔乌库姆冰草（Agropyron cristatum cv. Tawukumu）种子为材料，采用人工模拟碱（NaHCO3）胁迫，设10、30、60、90、120 mmolL-1 5个浓度作为碱处理，各浓度添加1.0 mmolL-1Na2SiO3溶液作为碱+硅处理，研究碱胁迫下硅对冰草种子萌发的影响。结果显示，在不同浓度的碱胁迫下添加外源硅显著增加了冰草种子发芽势、发芽率、发芽指数、活力指数、胚根和胚芽生物量（P0.05），明显缩短了萌发时间，提高了发芽整齐度。这一结果初步说明在碱胁迫下硅参与种子的萌发过程，在一定程度上降低渗透胁迫和离子毒害，增强了冰草种子在碱胁迫下的抵抗力。

Effects of silicon on Agropyron cristatum seed germination under alkaline stress

In order to study the effects of silion on seeds germination of Agropyron cristatum cv. Tawukumu under alkaline stress, the seeds performance under alkaline +silicon treatments including five alkaline (NaHCO3) stress levels (10，30，60，90 and 120 mmolL-1) with 1.0 mmolL-1 Na2SiO3 solution were evaluated. The results showed that Na2SiO3 treatment significantly increased (P0.05) germination energy, germination percentage, seed germination index, vigor index, biomass of shoot and root and significantly reduced (P0.05) germination time. The results preliminary explained that silicon involved in the germination under alkaline stress，reduced osmotic stress and ion toxicity and enhanced seed resistance.