Affiliation:
1. College of Horticulture, Shanxi Agricultural University, Taigu 030801, China
2. College of Grassland Science, Shanxi Agricultural University, Taigu 030801, China
Abstract
To investigate the effects of Pseudomonas monteilii SX001 on various parameters of cucumber plants under salt stress, the salt-sensitive cucumber variety “Jinyou No. 4” was used as the test material, and coconut bran was used to simulate salt stress by applying NaCl solution. The results indicated that salt stress significantly reduced the morphological structure, relative growth rate, root morphology, and photosynthetic parameters of the cucumber plants. Leaf starch, soluble sugar, and sucrose contents significantly increased, whereas their levels in roots decreased. Cell membrane damage leads to the accumulation of reactive oxygen species and malondialdehyde, with notable increases in the activities of major antioxidant enzymes such as SOD, CAT, and POD. Nitrogen metabolism was disrupted, as evidenced by a significant decrease in nitrate nitrogen content and an increase in ammonium nitrogen content, as well as a significant reduction in the activity of NR enzymes involved in nitrogen metabolism. The enzyme activity in the cucumber rhizosphere soil decreased. However, Pseudomonas monteilii SX001 significantly enhanced the growth of cucumber seedlings under salt stress, improved photosynthetic efficiency, and facilitated sugar transformation and transport via glucose metabolism. Additionally, Pseudomonas monteilii SX001 reduced the reactive oxygen content and increased antioxidant enzyme activity. It also increased the activity of substrate enzymes and decreased the diversity of rhizosphere soil microorganisms but also increased the abundance of Asticcacaulis, Acinetobacter, Brevundimonas, Pseudomonas, and Enterobacter. These findings demonstrate that Pseudomonas monteilii SX001 is a promising bioinoculant for alleviating salt stress in cucumber production and improving soil health.
Funder
Shanxi Province Key R&D Plan
Modern Agro-industry Technology Research System in Shanxi Province
Applied Fundamental Research Program of Shanxi Province
Reference56 articles.
1. Evaluating potential importance of cucumber (Cucumis sativus L.-Cucurbitaceae): A brief review;Mallick;Int. J. Appl. Sci. Biotechnol.,2022
2. Sharma Pseudomonas Recent advances in cucumber (Cucumis sativus L.);Kaur;J. Hortic. Sci. Biotechnol.,2022
3. Nutrient budget and soil nutrient status in greenhouse system;Yu;Agric. Sci. China,2010
4. Development status and trends of protected horticulture in China;Sun;J. Nanjing Agric. Univ.,2019
5. Effects of arbuscular mycorrhiza inoculation on plant growth, biological and physiological parameters and mineral nutrition in pepper grown under different salinity and p levels;Beltrano;J. Soil Sci. Plant Nutr.,2013