Plant growth promoting rhizobacterium Stenotrophomonas maltophilia BJ01 augments endurance against N2 starvation by modulating physiology and biochemical activities of Arachis hypogea

English version

Autoři: Ankita Alexander ^aff001; Vijay Kumar Singh ^aff001; Avinash Mishra ^aff001; Bhavanath Jha ^aff001
Působiště autorů: Biotechnology and Phycology Division, CSIR- Central Salt and Marine Chemicals Research Institute, G. B. Marg, Bhavnagar, Gujarat, India ^aff001; Academy of Scientific and Innovative Research (AcSIR), CSIR, Ghaziabad, India ^aff002
Vyšlo v časopise: PLoS ONE 14(9)
Kategorie: Research Article
doi: https://doi.org/10.1371/journal.pone.0222405

Souhrn

Arachis hypogea (Peanut) is one of the most important crops, and it is harvested and used for food and oil production. Being a legume crop, the fixation of atmospheric nitrogen is achieved through symbiotic association. Nitrogen deficiency is one of the major constrains for loss of crop productivity. The bacterium Stenotrophomonas maltophilia is known for interactions with plants. In this study, characteristics that promote plant growth were explored for their ability to enhance the growth of peanut plants under N₂ deficit condition. In the presence of S. maltophilia, it was observed that fatty acid composition of peanut plants was influenced and increased contents of omega-7 monounsaturated fatty acid and omega-6 fatty acid (γ-Linolenic acid) were detected. Plant growth was increased in plants co-cultivated with PGPR (Plant Growth Promoting Rhizobacteria) under normal and stress (nitrogen deficient) condition. Electrolyte leakage, lipid peroxidation, and H₂O₂ content reduced in plants, co-cultivated with PGPR under normal (grown in a media supplemented with N₂ source; C+) or stress (nitrogen deficient N+) conditions compared to the corresponding control plants (i.e. not co-cultivated with PGPR; C–or N–). The growth hormone auxin, osmoprotectants (proline, total soluble sugars and total amino acids), total phenolic-compounds and total flavonoid content were enhanced in plants co-cultivated with PGPR. Additionally, antioxidant and free radical scavenging (DPPH, hydroxyl and H₂O₂) activities were increased in plants that were treated with PGPR under both normal and N₂ deficit condition. Overall, these results indicate that plants co-cultivated with PGPR, S. maltophilia, increase plant growth, antioxidant levels, scavenging, and stress tolerance under N₂ deficit condition. The beneficial use of bacterium S. maltophilia could be explored further as an efficient PGPR for growing agricultural crops under N₂ deficit conditions. However, a detail agronomic study would be prerequisite to confirm its commercial role.

Klíčová slova:

Biology and life sciences – Organisms – Eukaryota – Plants – Legumes – Peanut – Plant science – Plant physiology – Plant defenses – Plant resistance to abiotic stress – Plant pathology – Plant ecology – Plant-environment interactions – Plant growth and development – Plant anatomy – Leaves – Ecology – Microbiology – Medical microbiology – Microbial pathogens – Bacterial pathogens – Stenotrophomonas maltophilia – Biochemistry – Lipids – Fatty acids – Antioxidants – Developmental biology – Ecology and environmental sciences – Medicine and health sciences – Pathology and laboratory medicine – Pathogens

Zdroje

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Plant growth promoting rhizobacterium Stenotrophomonas maltophilia BJ01 augments endurance against N2 starvation by modulating physiology and biochemical activities of Arachis hypogea

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