Bacillus Co-Inoculation Alleviated Salt Stress in Seedlings Cucumber

Abstract

Soil salinity has become a serious threat to crop growth and productivity and has aggravated the gap between sustainable food supply and population growth. Application of plant growth-promoting rhizobacteria (PGPR) has emerged as a novel way of alleviating the harmful effects of salt stress and improving soil nutrients. The aim of this study was to study the effects of exposure cucumber seedlings at one co-inoculation of Bacillus licheniformis and B. subtilis, a mitigation of salt stress in cucumber seedlings. In this study, we isolated salt tolerant (NX-3 and NX-4) and growth-promoting (NX-48, NX-59, and NX-62) bacteria from the rhizosphere of cucumber. NX-3 and NX-59 were identified as B. licheniformis, and NX-4, NX-48 and NX-62 were identified as B. subtilis. Under salt stress, relative to non-inoculation, co-inoculation with B. licheniformis and B. subtilis increased stem diameter and plant fresh weight. Moreover, the concentration of substrate available phosphorus increased (except for NX4-59). The catalase and sucrase activities of NX4-62 were the highest. Meanwhile, NX3-62 and NX3-59 had the highest phosphorus content and NX3-59 had the highest urease activities. Comprehensive analysis indicated that NX4-62 and NX3-59 showed the best effect on promoting cucumber seedlings growth, activating substrate nutrients, and alleviate salt stress in seedlings of cucumber.

Credibility assessment of cold adaptive Pseudomonas jesenni MP1 and P. palleroniana N26 on growth, rhizosphere dynamics, nutrient status, and yield of the kidney bean cultivated in Indian Central Himalaya

“…In addition, PCA and clustering analysis outcomes revealed the prolific effect of bioinoculants on kidney bean yield at both locations. A similar study by Qi et al (2021) also determined the best treatment through PCA and the role of plant growth promoting property attributable to plant physiological parameters through correlation analysis. Similar PCA cum clustering method was also employed by Sharma et al (2011) for determining the best Pseudomonas spp.…”

Effects of arbuscular mycorrhizal fungi and plant growth-promoting rhizobacteria on growth and reactive oxygen metabolism of tomato fruits under low saline conditions

“…Additionally, PGPRs are an important functional component of biofertilizers in laboratory research and agricultural production (Vessey, 2003;Salme et al, 2017). Numerous studies have indicated the promotion mechanisms of PGPR, including increasing the activity of antioxidant enzymes and metabolite accumulation and regulating the content of plant endogenous hormones (Panwar et al, 2016;Qi et al, 2021). Apart from this, most of the phosphorus is present in solid form in the soil, which is difficult to be harnessed by plants; however, previous studies have reported that PGPR improve the plant uptake of mineral elements, especially phosphorus (Dilfuza et al, 2017;Cordero et al, 2018).…”

Isolation and evaluation of Qatari soil rhizobacteria for antagonistic potential against phytopathogens and growth promotion in tomato plants

“…Thus, further tolerance tests were carried out using 10% NaCl, and the growth was reduced compared to the 5%, yet most of the bacterial isolates were capable of growing and only two stains had weak growth (SALIR5) and (SOVERR2). According to the literature, numerous bacteria including B. subtilis could promote plant growth under both normal and salt-stress conditions 93 , 94 . Furthermore, when salinity stress is increased, plants increase the synthesis of ethylene to decrease their growth, this is done by the production of 1-aminocyclopropane-1-carboxylic acid (ACC).…”