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• W3016679130 abstract "Bacterial endophytes are able to improve the growth of their hosts through a number ofdifferent mechanisms such as nutrient uptake regulation, plant hormone production andregulation, siderophore production and phosphate solubilisation. They have also been shownto be able to provide protection to plants against various abiotic stressors, through variousmeans such as oxidative stress protection. The purpose of this study was therefore to isolateendophytic bacteria from the stems of different weeds, to characterize their ability to usesome of the most important growth promoting mechanisms including the ability to produceIAA, siderophores and ACC deaminase, what effect they had on the nutrient uptake in theirhosts and to determine to what extent they could promote growth in the roots, stems andleaves of Brassica napus plants. In addition to this the endophytes were tested to see to whatextent they could protect Brassica napus from the negative effects of vanadium stress andhow this affected the plant physiologically in terms of morphology, overall biomass, the plantsnutrient profile, lipid peroxidation and levels of cell death. The effect of vanadium stress onthe oxidative state of Brassica napus was also monitored by determining the levels of stressinduced reactive oxygen species (ROS) and the corresponding antioxidants that areresponsible for regulating these reactive oxygen species.Six different endophytes (P1, P2, P3, P4, P5, P6) were isolated from different weed samples.Each endophyte was found to be able to significantly improve germination and growth in theirhost plant. Each isolate was able to improve the uptake of certain macronutrients andmicronutrients in their respective hosts, while all of the isolates were shown to be capable ofproducing siderophores and ACC deaminase. One isolate had high levels of IAA production,with the remaining isolates producing small amounts of IAA. All isolates were also unable tosolubilize phosphate.The five best performing endophytes (P1, P2, P3, P5, P6) in the preliminary growth trials wereused in the follow up vanadium stressed growth trials, with endophyte P4 being left out ofthe remaining experiments. All of the endophytes showed improvements in growthpromotion in comparison to the control, with endophyte treated plants showing bothincreased growth and biomass in both the non-stressed and vanadium stressed treatmentsof the vanadium stressed growth trial; however, the leaves of the vanadium stressed plantswere significantly smaller than their non-stressed counterparts. When looking at the oxidativestate it was found that vanadium stress caused a significant increase in the development ofO2-, H2O2 and •OH in the control and in addition to this it was shown that treatment withendophytes was able to cause a significant decrease in the levels of stress induced H2O2 and•OH in all of the treatments and O2- for plants treated with endophyte P5. The noted changein the oxidative state of endophyte treated plants…" @default.
• W3016679130 created "2020-04-24" @default.
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• W3016679130 date "2019-01-01" @default.
• W3016679130 modified "2023-09-22" @default.
• W3016679130 title "Isolation and characterization of stem endophytic bacteria from weed plants for enhancing Vanadium tolerance in Brassica napus" @default.
• W3016679130 hasPublicationYear "2019" @default.
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