Abstract As a result of global climatic changes, water deficiency is threatening food production for the increasing population worldwide, especially drought-sensitive crops, to which soybean belongs, by suppressing yield potentials. Drought stress can inhibit sown seeds’ germination and manipulate germination parameters. A controlled, two-stage experiment was conducted to investigate the effects of drought stress, induced by PEG (polyethylene glycol), on some germination parameters of two soybean cultivars; ‘ES Mentor’ and ‘Pedro’, in Debrecen, Hungary in 2018. At the first stage, 5 PEG concentrations; 10, 15, 20, 25, and 30%, besides control (0% PEG), were applied to each cultivar in 3 replicates. Results showed that both cultivars could not germinate when 25 and 30% of PEG were applied. Significant differences among PEG concentrations, between cultivars and their interaction were recorded. Based on these results, the second stage consisted of 6 PEG concentrations; 2.5, 5, 7.5, 10, 12.5 and 15% (besides control), also in three replicates. For both cultivars, germination ratio (GR) and root elongation (RE) decreased as the PEG concentration increased. Both germination energy (GE) and ultimate germination (UG) decreased, whereas mean period of altimate germination (MPUG) and percentage inhibition increased with increasing water stress. ‘ES Mentor’ could maintain higher (GR) than ‘Pedro’ under all PEG concentrations except 15%, whereas (RE) was lower under all concentrations. It was concluded that ‘ES Mentor’ can germinate better under different water deficiency levels; however, germinated seeds of ‘Pedro’ can tolerate relative water stress better, as the roots could elongate deeper searching for available water.

中文翻译：

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PEG诱导的干旱胁迫对大豆发芽参数的影响

摘要 由于全球气候变化，缺水通过抑制产量潜力威胁着全球不断增长的人口的粮食生产，特别是大豆所属的干旱敏感作物。干旱胁迫可以抑制播种的种子发芽并操纵发芽参数。进行了一个受控的两阶段试验，以研究由 PEG（聚乙二醇）诱导的干旱胁迫对两个大豆品种的一些发芽参数的影响；2018 年在匈牙利德布勒森的“ES Mentor”和“Pedro”。在第一阶段，5 个 PEG 浓度；除了对照（0% PEG）外，10%、15%、20%、25% 和 30% 的溶液以 3 次重复应用于每个栽培品种。结果表明，当应用 25% 和 30% 的 PEG 时，两个品种都不能发芽。PEG浓度之间的显着差异，记录了品种之间的相互作用及其相互作用。基于这些结果，第二阶段由 6 个 PEG 浓度组成；2.5、5、7.5、10、12.5 和 15%（对照除外），同样重复三次。对于两个品种，发芽率 (GR) 和根伸长率 (RE) 随着 PEG 浓度的增加而降低。发芽能 (GE) 和最终发芽 (UG) 均下降，而平均发芽期 (MPUG) 和抑制百分比随着水分胁迫的增加而增加。在除 15% 之外的所有 PEG 浓度下，“ES Mentor”可以保持比“Pedro”更高的 (GR)，而 (RE) 在所有浓度下都较低。得出的结论是，'ES Mentor' 在不同的缺水水平下可以更好地发芽；然而，“佩德罗”的发芽种子可以更好地耐受相对水分胁迫，