Environmental stresses, such as drought, represent the most limiting factors for agricultural productivity. Drought stress has drastic effects on the growth of canola plants. This study investigates the effects of inoculation with Pseudomonas fluorescens FY32 on the growth and antioxidant status of canola cultivars under drought stress induced by polyethylene glycol (PEG). The results show that bacterial inoculation improves the aerial dry weights and root length of canola plants under moderate drought stress. Peroxidase activity, as an antioxidant enzyme, increased in response to drought stress, whereas catalase activity remained constant, and polyphenol oxidase activity decreased. Compared to non-inoculated plants, inoculated plants showed significantly higher activities of antioxidant enzymes under drought stress. The inoculated canola cultivar Hyola308 exhibited a better protection mechanism against drought stress and was more tolerant than other cultivars exposed to drought stress, possibly due to its increased growth parameters and antioxidant enzyme activities. These results suggest that inoculation with the Pseudomonas fluorescens FY32 strain might alleviate the adverse effects of drought stress and lead to less stress pressure on plants.

干旱等环境压力是农业生产力的最大限制因素。干旱胁迫对双低油菜籽植物的生长产生巨大影响。本研究探讨了在聚乙二醇（PEG）诱导的干旱胁迫下，接种荧光假单胞菌 FY32 对油菜品种生长和抗氧化状态的影响。结果表明，细菌接种提高了中度干旱胁迫下油菜植株的气干重和根长。作为一种抗氧化酶，过氧化物酶活性随着干旱胁迫而增加，而过氧化氢酶活性保持不变，多酚氧化酶活性下降。与未接种植物相比，接种植物在干旱胁迫下表现出显着更高的抗氧化酶活性。接种的双低油菜品种 Hyola308 表现出更好的干旱胁迫保护机制，并且比其他暴露于干旱胁迫的品种更耐受，这可能是由于其生长参数和抗氧化酶活性的增加。这些结果表明，接种荧光假单胞菌FY32菌株可能减轻干旱胁迫的不利影响，并减轻植物的胁迫压力。