Drought and salinity are the main limiting environmental factors that restrict the establishment of soya bean plants. In order to recommend genotypes for cultivation under adverse drought and saline stress conditions, multi‐environment trials (MET) are needed. However, MET analysis is usually performed considering a single trait, which provides lower reliability in recommending genotypes when compared to multi‐trait analysis. Thus, this study was carried out to investigate the stability of multi‐trait stability index (MTSI) in 46 soya bean cultivars under the effects of drought and saline stress on seed germination and initial seedling growth. Drought and saline stresses were imposed by seed exposure to −0.20 MPa iso‐osmotic solutions with polyethylene glycol—PEG 6000 (119.6 g/L) or NaCl (2.36 g/L) for 12 days at 25°C. The germination rate, seedling length and seedling dry matter were measured. We showed here how genotypic stability can be quantified by MTSI when comparing drought and salinity conditions in relation to non‐stressful environment (control) and how this index can be employed under different conditions. When considering the index for multiple environments, we can select as the most stable genotypes TMG 716 RR, FPS Antares RR, AS 3610 IPRO, NS 7300 IPRO and FPS Solar IPRO among the 46 tested genotypes. Owing to high stability and gains with selection verified for these genotypes under salinity and drought conditions, they can be used as genitors in breeding programs aimed at obtaining offspring with higher resistance to antibiotic stresses.

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多性状稳定性指数：干旱和盐胁迫下同时选择大豆基因型的工具

干旱和盐分是限制大豆植物生长的主要限制环境因素。为了推荐在干旱和盐胁迫条件下进行栽培的基因型，需要进行多环境试验（MET）。但是，MET分析通常在考虑单一性状的情况下进行，与多性状分析相比，在推荐基因型时可靠性较低。因此，本研究旨在研究多特征稳定性指标的稳定性。干旱和盐胁迫对46个大豆品种的种子萌发（MTSI）影响。在25°C下，用聚乙二醇PEG 6000（119.6 g / L）或NaCl（2.36 g / L）暴露于−0.20 MPa等渗溶液中，使种子承受干旱和盐胁迫。测定发芽率，幼苗长度和幼苗干物质。当比较干旱和盐度条件与非胁迫环境（对照）的关系时，我们在这里展示了MTSI如何量化基因型稳定性，以及如何在不同条件下采用该指标。在考虑多种环境的指标时，我们可以在46种测试基因型中选择最稳定的基因型TMG 716 RR，FPS Antares RR，AS 3610 IPRO，NS 7300 IPRO和FPS Solar IPRO。