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Characterization of plant growth-promoting rhizobacterial isolates associated with food plants in South Africa
Antonie van Leeuwenhoek ( IF 2.6 ) Pub Date : 2021-08-13 , DOI: 10.1007/s10482-021-01633-4
Oluwaseun Adeyinka Fasusi 1 , Adenike Eunice Amoo 1 , Olubukola Oluranti Babalola 1
Affiliation  

The region around the plant root referred to as the rhizosphere, is the zone where various microbial activity occurs. It performs crucial functions such as increasing the uptake of nutrients for plant development and preventing plant against plant pathogens. Keeping in mind the beneficial role performed by rhizospheric microorganisms, rhizobacterial species were isolated from the maize and soybean plant's rhizosphere. The isolated microorganisms were evaluated for their biochemical characteristics, plant growth-promoting potentials, tolerance to different environmental conditions, and their antifungal activity against Fusarium graminearum, a fungal pathogen that infects maize. The rhizobacterial isolates with multiple plant growth-promoting potentials were identified as Bacillus spp (80.77%), Rhodocyclaceae bacterium (3.85%), Enterococcus spp (3.85%). Massilia spp (3.85%. and Pseudomonas (7.69%) species based on their 16S rRNA molecular characterization. The bacterial isolates possessed antifungal activities against Fusarium graminearum, promote maize and soybeans seed under laboratory conditions, and exhibited different levels of tolerance to pH, temperature, salt, and heavy metal. Based on this, the whole genome sequencing of Bacillus sp. OA1, Pseudomonas rhizosphaerea OA2, and Pseudomonas sp. OA3 was performed using Miseq Illumina system to determine the functional genes and secondary metabolites responsible for their plant growth-promoting potential Thus, the result of this research revealed that the selected bacterial isolates possess plant growth-promoting potentials that can make them a potential candidate to be employed as microbial inoculants for protecting plants against phytopathogens, environmental stress and increasing plant growth and productivity.



中文翻译:

与南非食用植物相关的促进植物生长的根际细菌分离株的表征

植物根部周围的区域称为根际,是各种微生物活动发生的区域。它具有重要的功能,例如增加植物发育所需的养分吸收和防止植物抵抗植物病原体。牢记根际微生物的有益作用,从玉米和大豆植物的根际中分离出根际细菌。评估了分离的微生物的生化特性、植物生长促进潜力、对不同环境条件的耐受性以及它们对禾谷镰刀菌(一种感染玉米的真菌病原体)的抗真菌活性。具有多种植物生长促进潜力的根际细菌分离株被鉴定为芽孢杆菌属spp (80.77%)、Rhodocyclaceae细菌 (3.85%)、肠球菌(3.85%)。Massilia spp (3.85% .Pseudomonas (7.69%) 物种基于它们的 16S rRNA 分子特征。细菌分离物对禾谷镰刀菌具有抗真菌活性,在实验室条件下促进玉米和大豆种子的生长,并对 pH 值、温度表现出不同程度的耐受性, 盐, 和重金属. 基于此, Bacillus sp. OA1, Pseudomonas rhizosphaerea OA2, 和Pseudomonas的全基因组测序sp。OA3 是使用 Miseq Illumina 系统进行的,以确定负责其植物生长促进潜力的功能基因和次生代谢物。可用作微生物接种剂,以保护植物免受植物病原体、环境压力和提高植物生长和生产力。

更新日期:2021-08-19
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