Among the long-term sustainable solutions to mitigate saline stress on plants, the use of plant growth promoting microorganisms (PGP) is considered very promising. While most of the efforts have been devoted to the selection and use of bacterial PGPs, little has been proposed with yeast PGP (PGPYs). In this study, three PGPY strains belonging to Naganishia uzbekistanensis, Papiliotrema terrestris and Solicoccozyma phenolica were employed singularly and in a consortium to mitigate salt stress of zucchini (Cucurbita pepo). The results demonstrated that these yeasts, when applied to salt-amended soil, mitigated the growth inhibition caused by NaCl. Among the three species, N. uzbekistanensis and P. terrestris showed the most significant improvements in plant performance, with N. uzbekistanensis exhibiting hormetic effects under salt stress by improving root length and dry plant biomass. In general, the root system was the most affected part of the plants due to the presence of the yeasts. The entire rhizosphere bacterial microbiota was significantly influenced by the addition of PGPYs, while the mycobiota was dominated by the introduced yeasts. Metabolomic fingerprinting using FTIR revealed modifications in hemicellulose and silica content, indicating that PGPY inoculation impacts not only the plant but also the soil and rhizosphere microorganisms.

在减轻植物盐胁迫的长期可持续解决方案中，使用植物生长促进微生物 （PGP） 被认为非常有前途。虽然大部分精力都致力于细菌 PGP 的选择和使用，但对酵母 PGP （PGPY） 的提议很少。在这项研究中，属于 Naganishia uzbekistanensis、Papiliotrema terrestris 和 Solicoccozyma phenolica 的 3 株 PGPY 菌株被单独使用并联合使用，以减轻西葫芦 （Cucurbita pepo） 的盐胁迫。结果表明，当这些酵母施用于盐改良土壤时，减轻了 NaCl 引起的生长抑制。在这 3 个物种中，乌兹别克猪笼草和毛蛙在植物性能上表现出最显著的改善，其中乌兹别克猪笼草在盐胁迫下通过提高根长和干燥植物生物量表现出兴奋作用。一般来说，由于酵母的存在，根系是植物受影响最大的部分。PGPYs 的添加对整个根际细菌微生物群有显著影响，而菌群则以引入的酵母菌为主。使用 FTIR 进行的代谢组指纹图谱揭示了半纤维素和二氧化硅含量的变化，表明 PGPY 接种不仅影响植物，还影响土壤和根际微生物。