不同硅处理方式对干旱胁迫下大麦萌发的影响

【目的】研究不同处理方式下不同浓度的硅对干旱胁迫下大麦萌发的影响，综合评价各处理下大麦幼苗的抗旱性，确定最佳处理。【方法】分别在种子发芽前使用硅溶液浸种(A处理)和在种子发芽的培养过程中向发芽盒里加硅培养液(B处理)两种方式处理新啤6号大麦种子，两种方式均设置0.0、0.5、1.0、1.5和2.0 mmol/L Na₂SiO₃·9H₂O浓度水平，研究对干旱胁迫下大麦发芽指标、形态指标和生长量的影响。【结果】A处理下随着硅浓度的增加发芽势、发芽指数、活力指数、根长、芽长、芽鞘长、根数、根和芽的鲜重与干重均呈现先增加后降低的趋势，而根芽比呈先降低后增加的趋势，发芽率无显著变化。B处理下0.0和0.5 mmol/L Na₂SiO₃·9H₂O浓度下各指标均无显著差异，1.0～2.0浓度区间内根芽比随硅浓度增加呈降低趋势，其他各指标随硅浓度增加而增加。【结论】1.0 mmol/L Na₂SiO₃·9H₂

Effects of Different Silicon Treatments on Barley Germination under Drought Stress

【Objective】 To study the effects of different concentrations of silicon on the germination of barley under drought stress with different treatments and comprehensively evaluate the drought resistance of barley seedlings under each treatment, so as to determine the best treatment. 【Methods】 Barley variety 'Xinpi6' was treated respectively by soaking seeds with silicon solution before germination (treatment A) and adding silicon culture solution to the germination box (treatment B).The concentration of Na₂SiO₃·9H₂O was set at 0.0, 0.5, 1.0, 1.5 and 2.0 mmol/L in both methods to study the effects of drought stress on germination indicator, morphological indicator and growth of barley. 【Result】 In the treatment A, with the increase of silicon concentration, germination potential, germination index, vigor index, root length, bud length, coleophyllum length, root number, fresh and dry weight of root and bud all increased first and then decreased, while the root-bud ratio decreased first and then increased.There was no significant difference in germination rate under different silicon concentrations.In the treatment B, there was no significant difference in all indicators at 0.0 and 0.5 mmol/L Na₂SiO₃·9H₂O concentrations.The root shoot ratio decreased with the increase of the silicon concentration from 1.0 to 2.0, while other indicators increased with the increase of silicon concentration. 【Conclusion】 It was the best for the drought resistance of barley seedlings treated by soaking of seeds with 1.0 mmol/L Na₂SiO₃·9H₂O.