Article: Contribution of zinc solubilizing bacterial isolates on enhanced zinc uptake and growth promotion of maize (Zea mays L.)
Folia microbiologica. 2021 Aug., v. 66, no. 4
2021
Abstract: Zinc-solubilizing bacteria, namely Burkholderia cepacia and Acinetobacter baumannii (H1 and H3, respectively), able to grow in liquid basal medium supplemented with ZnO, Zn₃ (PO₄)₂, and ZnSO₄·7H₂O (0.1%), showed plant growth promoting properties. The ... ...
| Abstract | Zinc-solubilizing bacteria, namely Burkholderia cepacia and Acinetobacter baumannii (H1 and H3, respectively), able to grow in liquid basal medium supplemented with ZnO, Zn₃ (PO₄)₂, and ZnSO₄·7H₂O (0.1%), showed plant growth promoting properties. The treatment of Acinetobacter baumannii (H3) solubilizes the ZnO (1.42 ppm), Zn₃ (PO₄)₂ (1.15 ppm), and ZnSO₄·7H₂O (1.44 ppm).The maximum solubilization of ZnSO₄·7H₂O (1.42 ppm) was observed in Burkholderia cepacia (H1) after 15 days. Organic acids produced by the bacteria decreased the pH of the medium and helped in Zn solubilization. In pot experiment on maize, Burkholderia cepacia (H1) treatment significantly enhanced plant height and root length in the presence of ZnO (2%) added in 10 mL of inoculum in each pot. High-performance liquid chromatography (HPLC) analysis of maize root extract showed the presence of oxalic, maleic, tartaric, and fumaric acid after 60 days of the experiment. Bacterial treatments enhanced sugar and protein level in maize plants and were 55.2 and 42.55 µg/mL plant extract, respectively, under mixture of bacterial treatment. Hence, isolates H1 and H3 expressed highest potential throughout the experiments, as zinc solubilizers and plant growth-promoting strains. This study demonstrated that meticulous use of Zn-solubilizing bacterial strains could aid in enhanced plant growth and can be the potential bio-inoculants for biofortification of maize to overcome the problems of malnutrition. |
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| Keywords | Acinetobacter baumannii ; Burkholderia cepacia ; Zea mays ; biofortification ; corn ; culture media ; fumaric acid ; growth promotion ; high performance liquid chromatography ; inoculum ; liquids ; malnutrition ; pH ; plant growth ; plant height ; protein content ; root extracts ; solubilization ; sugars ; zinc |
| Language | English |
| Dates of publication | 2021-08 |
| Size | p. 543-553. |
| Publishing place | Springer Netherlands |
| Document type | Article |
| ZDB-ID | 240503-9 |
| ISSN | 1874-9356 ; 0015-5632 |
| ISSN (online) | 1874-9356 |
| ISSN | 0015-5632 |
| DOI | 10.1007/s12223-021-00863-3 |
| Database | NAL-Catalogue (AGRICOLA) |
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