富氢水对干旱胁迫下大麦种子萌发及幼苗生物量分配的影响

Effects of Hydrogen-Rich Water on Barley Seed Germination and Barley Seedling Biomass Distribution under Drought Stress

为探讨富氢水对干旱胁迫下大麦种子萌发期抗旱性与幼苗生物量分配的影响,以大麦品种"新啤6号"为试材,采用20%聚乙二醇(PEG)-6000模拟干旱胁迫,比较不同浓度富氢水浸种处理后大麦种子的发芽率和幼苗根冠比等16个指标的差异。结果表明,适宜浓度的富氢水处理能显著提高干旱胁迫下大麦种子的发芽率、干物质转移量、转移率及转化效率,并减少呼吸消耗干物质量,还可以降低干旱胁迫下大麦幼苗根冠比,增加幼苗根和芽的干重,促进幼苗可溶性糖、可溶性蛋白及叶绿素累积。由此可知,一定浓度的富氢水能通过调控种子干物质转运的途径提升干旱胁迫下大麦种子的萌发率,并可通过调节可溶性糖、可溶性蛋白和叶绿素含量降低干旱胁迫对大麦幼苗根和芽生物量分配的不利影响。

To investigate the effects of hydrogen-rich water(HRW) on drought resistance in germination period and seedling biomass distribution under drought stress, barley variety Xinpi 6 was used as material, which cultured in 20% polyethylene glycol-6000(PEG). The 16 indexes were compared in different concentrations of HRW, such as germination rate and seedling root-shoot ratio. The results showed that the suitable concentration of HRW treatment could significantly increase the germination rate, dry matter transfer amount, transfer rate, and conversion efficiency;reduced respiratory consumption of dry matter and root-shoot ratio;increased the roots and buds’ dry weight;promoted the accumulation of soluble sugar, soluble protein, and chlorophyll in barley seedlings. It could be concluded that suitable concentration of HRW could increase the germination rate of barley seeds under drought stress by regulating the transport of dry matter, and reduce the adverse effects of drought stress on the proportion of root and bud biomass of seedlings by regulating the contents of soluble sugar, soluble protein, and chlorophyll.