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Effect of the inoculation of plant growth promoting bacteria on maize plants to improve their growth under drought stress

dc.contributor.authorAbreu, Daniela
dc.contributor.authorPereira, Sofia
dc.contributor.authorMoreira, Helena
dc.contributor.authorVega, Alberto
dc.contributor.authorCastro, Paula
dc.date.accessioned2018-11-28T19:24:38Z
dc.date.available2018-11-28T19:24:38Z
dc.date.issued2017
dc.description.abstractBackground: According to the United Nations, by 2050 the world population will reach approximately 9.6 billion people, which implies a major challenge for the agricultural sector to improve crop production and to ensure food availability in the near future. However, global warming and bad agricultural practices are impairing food productivity. Drought is one of the major limiting factors for plant growth, causing dehydration and nutrient deficiency. Therefore, the application of sustainable practices in agriculture is essential to maintain soil fertility and to increase crop productivity. It has been demonstrated that plant growth promoting bacteria (PGPB) have positive effects on plants growing under drought conditions. The aim of this work is to evaluate the effect of two PGPB inocula size on maize growth and nutrient content under different water regimes (80, 60 and 40% of soil water holding capacity (WHC)). Method: Thirteen PGPB were screened in vitro for osmotic tolerance and indole acetic acid (IAA) production under different osmotic potentials. Strains Pseudomonas fluorescens S3X and Ralstonia eutropha 1C2 were inoculated in maize under greenhouse conditions. Different bacterial treatments and two inocula sizes (2.5 x 10 6 and 3.3 x 10 3 cell. g -1 dry weight) were applied on plants growing at 80, 60 and 40% of soil WHC. Plants were harvested after 13 weeks. Dry biomass and the accumulation of N and P on roots and shoots were determined. The activity of soil enzymes, such as catalase, and the fluorescein diacetate (FDA) hydrolysis were also evaluated. Results & Conclusions: Maize growth was affected by the water regimes applied, especially at 40% of WHC. Bacterial inoculation enhanced some biometric parameters at 80 and 60% of WHC, however, the effects observed were similar for both inocula size applied. It was observed a severe reduction of FDA activity at 40% WHC, which indicates that the microbial activity was negatively affected by low soil moisture.
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationAbreu, D.; Pereira, S.; Moreira, H.; Vega, A.; Castro, P. (2017) Effect of the inoculation of plant growth promoting bacteria on maize plants to improve their growth under drought stress. Microbiotec’17 - 2017, Book of Abstracts - Congress of Microbiology and Biotechnology, 7-9 December, Porto, Portugal.pt_PT
dc.identifier.urihttp://hdl.handle.net/10400.14/26222
dc.language.isoengpt_PT
dc.relation.publisherversionhttp://www.porto.ucp.pt/sites/default/files/files/Biotecnologia/Microbiotec17/BookofAbstracts_15_12_2017.pdfpt_PT
dc.subjectPlant growth promoting bacteria
dc.subjectDrought stress
dc.subjectMaize
dc.titleEffect of the inoculation of plant growth promoting bacteria on maize plants to improve their growth under drought stresspt_PT
dc.typeconference object
dspace.entity.typePublication
oaire.citation.titleMICROBIOTEC'17 - 2017pt_PT
person.familyNameCastro
person.givenNamePaula
person.identifier2013444
person.identifier.ciencia-id7C1F-6C72-354A
person.identifier.orcid0000-0001-8841-6606
person.identifier.ridM-8241-2013
person.identifier.scopus-author-id7102781782
rcaap.rightsopenAccesspt_PT
rcaap.typeconferenceObjectpt_PT
relation.isAuthorOfPublicationf2253992-dc8d-4042-9a0f-597ebcf0a1d6
relation.isAuthorOfPublication.latestForDiscoveryf2253992-dc8d-4042-9a0f-597ebcf0a1d6

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