The effects of water and salt stress on rate of germination and seedling growth were investigated under laboratory conditions in 46 soya bean genotypes from Central‐West region of Brazil to verify how these stresses may limit crop establishment during the initial growth stage and also to identify the most tolerant genotypes to drought and salinity. Mild water and salt stresses were imposed by seed exposure to –0.20 MPa iso‐osmotic solutions with polyethylene glycol—PEG 6000 (119.57 g/L) or NaCl (2.357 g/L) for 12 days at 25°C. The germination percentage, seedling length and seedling dry matter were measured, and then, salt or drought tolerance indexes were calculated. The “NS 5909 RG,” “NS 7000 IPRO,” “NS 7338IPRO,” “FPS Solimões RR,” “NS 5151 IPRO,” “SYN 13610 IPRO,” “LG 60177 IPRO,” “NS 6909 IPRO” and “BMX Desafio RR” were identified as the most drought‐tolerant genotypes, whereas under salinity conditions, the genotypes “5D 615 RR,” “BMX Desafio RR,” “5D 6215 IPRO” and “BMX Ponta IPRO” were identified as tolerant. The “BMX Desafio RR” is the genotype most adapted to both stress conditions and, therefore, should be used under conditions of water shortage and excess salt in the soil at sowing time.

中文翻译：

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水和盐胁迫如何影响巴西大豆品种的发芽和初期生长？

在实验室条件下，研究了巴西中西部地区46种基因型大豆中水分和盐胁迫对发芽率和幼苗生长的影响，以验证这些压力如何限制植物在初始生长阶段的生长，并确定对干旱和盐分最耐受的基因型。在25°C下，将种子暴露于含聚乙二醇PEG 6000（119.57 g / L）或NaCl（2.357 g / L）的–0.20 MPa等渗溶液中，施加轻度的水分和盐胁迫。测量发芽率，幼苗长度和幼苗干物质，然后计算耐盐或干旱指数。“ NS 5909 RG”，“ NS 7000 IPRO”，“ NS 7338IPRO”，“ FPSSolimõesRR”，“ NS 5151 IPRO”，“ SYN 13610 IPRO”，“ LG 60177 IPRO” “ NS 6909 IPRO”和“ BMX Desafio RR”被确定为最耐旱的基因型，而在盐度条件下，基因型为“ 5D 615 RR”，“ BMX Desafio RR”，“ 5D 6215 IPRO”和“ BMX Ponta” IPRO”被认为是可以耐受的。“ BMX Desafio RR”是最适合两种胁迫条件的基因型，因此，应在播种时缺水和土壤中盐分过多的条件下使用。