Biofertilizer based on halotolerant microorganisms promotes the growth of rice plants and alleviates the effects of saline stress

Abstract

Long-term soil salinization easily contributes to soil hardness, soil nutrient imbalance, and soil microbial diversity reduction, resulting in low rice yields in the salinized fields, and microbial remediation is one of the important measures to improve salinized soil. To verify the effect of biofertilizer based on halotolerant microorganisms on promoting rice growth and alleviating saline stress, this study discussed the effects of biofertilizer on soil microbial diversity and community structure and analyzed the correlation between the formation of microbial community structure and soil nutrient factors in the salinized field. The result, in comparison with applying inorganic fertilizer (referred to as CK), showed that notably increased soil available nitrogen, available phosphorus, available potassium, and rice paddy yield (p < 0.05) and significantly decreased soil electrical conductivity (p < 0.05) were achieved via biofertilizer (referred to as G2). Additionally, the application of biofertilizer contributes to the increase in soil microbial diversity and reorganization of microbial community structure, and through the analysis of linear discriminant analysis effect size, a notable difference in relative abundance was found in 13 genera, 6 families, and 3 orders between the control group and experimental groups (p < 0.05), and by linear discriminant analysis, Desulfomonas was further identified as the differentiated indicator. The redundancy analysis showed that available phosphorus and cation exchange capacity were the key environmental factors that affected microbial community structure and composition. Through bacterial functional prediction, increased rhizosphere soil bacterial metabolism, enzyme activity, membrane transport, and other potential functions were achieved by applying biofertilizer. Therefore, the application of biofertilizer could significantly alleviate rice growth stress and increase nutrient supply capacity in saline soil. These findings provide theoretical support for soil microbial improvement technology in the salinized field.

Response of Phyllosphere and Rhizosphere Microbial Communities to Salt Stress of Tamarix chinensis

“…Salt stress affects potential functions such as microbial metabolism and material cycling in plant rhizosphere soils [ 43 ]. In this study, salt stress increased the relative abundance of rhizosphere bacterial carbon and sulfur cycle groups in T. chinensis , and it has been shown that changes in the carbon cycle group are more pronounced in the rhizosphere in response to salinity stress [ 44 ].…”

Rational Utilization of Sediment Resources Improves Rice Yield and Nitrogen Use Efficiency under Salt Stress

“…The sediment contains a large amount of oxidized and well-decomposed organic matter owing to microbial activity [21]. The organic substances are decomposed and/or oxidized by bacteria, and nutrients such as N, phosphorus, and potassium are released under appropriate conditions [22]. In addition to organic matter and a large amount of available nutrients, sediment is also rich in trace elements such as calcium, iron, manganese, copper, zinc, boron, magnesium, etc.…”

Culturomics and Amplicon-Based Metagenomic Insights into the Bacteria of Soils with High Yield of Oryza sativa L. subsp. Japonica

“…For example, an increase in the special bacterial groups: Bryobacter, Xanthobacteriaceae, and Gemmatimonas can reduce the effective Cd content in rice fields [13]. Halotolerant microorganisms Agrobacterium tumefaciens, Bacillus subtilis, and Lysinibacillus fusiformis alleviate saline stress in rice, thus promoting rice growth in the salinized field [14,15]. Endophytic seed-associated bacteria (Pantoea sp.…”