Crop inoculation with plant growth-promoting rhizobacteria (PGPR) is a sustainable alternative to diminish the excessive use of chemical fertilizers in agriculture. However, there is little information about PGPR inoculation effects under field conditions and even less on industrial tomato production. We aimed to study the effects of a sole inoculation at seedling stage with Pseudomonas fluorescens Rt6M10, Azospirillum brasilense Az39, and their combination on growth and yield of two industrial tomato varieties UCO 14 (UCO) and Harris Moran 3861 (HM). We compared these PGPR inoculation treatments with chemically fertilized and non-fertilized (control) seedlings under field conditions. We found that inoculation with Rt6M10, Az39, and their combination increased seedling root dry weight by 62%, 41%, and 23%, respectively and shoot dry weight by 29%, 23%, and 2%, respectively compared with non-inoculated control, improving tolerance to transplant stress. Inoculation with Rt6M10, Az39, and their combination increased stem diameter by 15%, 16%, and 13%, respectively, while Rt6M10 and the combination treatments increased leaf chlorophyll and carotenoid levels compared with non-inoculated plants. Az39 increased fruit number (35%) and fruit weight (38%) per plant in HM, whereas in UCO variety, the increase was the highest (48% and 49%, respectively). Seedling inoculation increase fruit firmness and equatorial and polar fruit diameter by 24%, 10%, and 12%, respectively in HM and by 21%, 14%, and 14%, respectively in UCO. Overall, bio-inoculation with Rt6M10 and/or Az39 was beneficial for tomato seedlings at transplanting and supported fruit yield and quality (total soluble solid content, pH, and titratable acidity) equally or better than chemically fertilized seedlings.

中文翻译：

---

荧光假单胞菌和巴西固氮螺菌在田间条件下提高番茄产量和果实品质

用促进植物生长的根际细菌 (PGPR) 进行作物接种是减少农业中过度使用化肥的可持续替代方法。然而，关于大田条件下PGPR接种效果的信息很少，工业番茄生产的信息更少。我们旨在研究在幼苗期单独接种荧光假单胞菌 Rt6M10、巴西固螺菌 Az39 及其组合对两个工业番茄品种 UCO 14 (UCO) 和 Harris Moran 3861 (HM) 生长和产量的影响。我们在田间条件下将这些 PGPR 接种处理与化学施肥和未施肥（对照）幼苗进行了比较。我们发现接种 Rt6M10、Az39 和它们的组合分别使幼苗根干重增加了 62%、41% 和 23%，将地上部干重增加了 29%，与未接种的对照相比，分别提高了 23% 和 2%，提高了对移植应激的耐受性。与未接种的植物相比，接种 Rt6M10、Az39 及其组合分别使茎直径增加了 15%、16% 和 13%，而 Rt6M10 和组合处理增加了叶绿素和类胡萝卜素水平。Az39 增加了 HM 中每株植物的果实数量 (35%) 和果实重量 (38%)，而在 UCO 品种中，增加幅度最大（分别为 48% 和 49%）。在 HM 和 UCO 中，幼苗接种使果实硬度和赤道和极地果实直径分别增加了 24%、10% 和 12%，分别增加了 21%、14% 和 14%。总体而言，用 Rt6M10 和/或 Az39 进行生物接种有利于番茄幼苗移栽并支持果实产量和质量（总可溶性固形物含量、pH、