The current research was carried out to evaluate the stress tolerance potential of durum wheat plants, in response to the inoculation of native plant growth-promoting bacteria (PGPB), through assessing PSII photochemistry and photosynthetic traits, as well as grain yield and plant height, and to investigate the possibility of using PGPB as a sustainable alternative or in combination with traditional fertilization plans. A greenhouse experiment included chemical/microbiological fertilization and stress (salinity and drought) treatments. The results indicated that the application of bacterial consortium of four PGPB markedly augmented some biochemical and functional traits in photosystem II, such as effective quantum yield of PSII photochemistry (Y(II)), electron transport rate of PSII (ETR), photosynthesis capacity, transpiration rate and stomatal conductance in unstressed plants, and prevented severe changes in the mentioned traits under drought and salinity conditions. The application of PGPB contributed to enhanced grain yield, too. Furthermore, a better performance of the PGPB inoculation was found in combination with half-dose of the recommended chemical fertilizers. In conclusion, PGPB inoculants maintain or improve the photosynthesis efficiency of durum wheat, grain yield and plant height, particularly under stress conditions, and can help to minimize the consumption of chemical fertilizers.

目前的研究是通过评估 PSII 光化学和光合性状，以及籽粒产量和株高，评估硬粒小麦植物对接种天然植物生长促进细菌 (PGPB) 的逆境耐受潜力，并调查使用 PGPB 作为可持续替代方案或与传统施肥计划结合使用的可能性。温室实验包括化学/微生物施肥和压力（盐度和干旱）处理。结果表明，四种 PGPB 菌群的应用显着增强了光系统 II 的一些生化和功能特性，如 PSII 光化学的有效量子产率 (Y(II))、PSII 的电子传递速率 (ETR)、光合作用能力、未受胁迫植物的蒸腾速率和气孔导度，并防止在干旱和盐度条件下上述性状发生严重变化。PGPB 的应用也有助于提高粮食产量。此外，发现与推荐的化肥的半剂量组合使用 PGPB 接种的性能更好。综上所述，PGPB 接种剂可保持或提高硬粒小麦的光合作用效率、籽粒产量和株高，尤其是在逆境条件下，并有助于最大限度地减少化肥的消耗。发现与推荐的化肥的半剂量组合使用PGPB接种具有更好的性能。综上所述，PGPB 接种剂可保持或提高硬粒小麦的光合作用效率、籽粒产量和株高，尤其是在逆境条件下，并有助于最大限度地减少化肥的消耗。发现与推荐的化肥的半剂量组合使用PGPB接种具有更好的性能。综上所述，PGPB 接种剂可保持或提高硬粒小麦的光合作用效率、籽粒产量和株高，尤其是在逆境条件下，并有助于最大限度地减少化肥的消耗。