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Long-term adaptation study of bacterial isolates of plant growth-promoting bacteria in heat-stressed conditions
Summary
Researchers examined whether plant growth-promoting bacteria can adaptively respond to heat stress, finding that bacteria under periodic stress consistently outperformed those under non-periodic stress across multiple growth-promoting traits, with two novel Paenibacillus alvei strains showing the strongest adaptive capacity.
In many bacterial species, there is still a lack of comprehensive research and characterization of the basic mechanisms behind bacterial adaptation. Furthermore, it's still unclear if prokaryotes can learn by association and adaptation. Since Plant Growth Promoting Bacteria (PGPB) are essential to the preservation of plant physiology and growth across a range of stress scenarios, PGPB can be utilized to analyze this adaptation of bacteria under stress. This study examines the initial findings on adaptive flexibility in PGPB under conditions of heat stress. The performance of the isolated PGPB receiving both periodic and non-periodic heat stress was compared to that of the control group. Characteristics such as ammonia and siderophore production, phosphate utilization, and amount of indole-3-acetic acid produced, as well as anti-oxidant activities like DPPH activity, hydroxyl radical scavenging activity, and hydrogen peroxide scavenging activity were analysed. Following heat stress treatment, it was clear from the isolated PGPB that those under periodic stress were able to outperform the PGPB exposed to non-periodic stress in comparison to the control. When compared to the other isolates in our investigation, the two novel strains of Paenibacillus alvei SJ6 and Paenibacillus alvei SJ8, among the four isolated PGPB have demonstrated the greatest capacity to respond to sporadic heat stress. Therefore, preliminary evidence for the existence of history-dependent adaptation has been examined in this work.
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