Effects of Seawater Nutrients on Plant-Microbe Interactions

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dc.contributor.advisor Lear, G en
dc.contributor.advisor Padamsee, M en
dc.contributor.author King, Isobel en
dc.date.accessioned 2020-05-20T23:11:57Z en
dc.date.issued 2019 en
dc.identifier.uri http://hdl.handle.net/2292/50755 en
dc.description Full Text is available to authenticated members of The University of Auckland only. en
dc.description.abstract Globally, there is an urgent need to develop more effective and sustainable practices to maximise crop yields while also minimising industrial-scale agricultural impacts. Seawater irrigation offers an attractive way to replace and/or reduce the use of agrochemicals and other supplements (e.g., fungicides), by reducing trace nutrient deficiencies in crops. There are numerous reports of increased yield and nutritive content of vegetable crops exposed to seawater, as well as greater tolerance to abiotic and biotic stressors, but it is unclear whether the impacts of seawater additions are direct (plants taking up nutrients) or indirect (mediated by shifts in soil-plant-associated microbial communities). A greenhouse experiment was conducted, irrigating Beta vulgaris L., Fragaria x ananassa Duch. and Pisum sativum L. with different concentrations of seawater (0, 10, 20, 30, 50, 70, 100%) to analyse the effects on the nutrient content in the growing medium and edible plant tissues and shifts in fungal root endophyte communities. Endophytes were isolated using culturing methods and identified by ITS gene sequencing. Seawater significantllayincreased the electrical conductivity, pH and moisture content of the growing medium, with >50% seawater having a negative impact on plant growth and soil properties. Typically, the plant -microbiome benefited from 10% seawater, showing increases in either plant biomass or yield, with nutrient uptake and total dissolved solids increasing in edible plant tissues. Significant increases in fungal community richness and diversity were also observed, suggesting that the nutrient niches of seawater could have indirect benefits on plant growth by stimulating the microbial community. Results of this study suggest that when applied at low concentrations, seawater could have a positive effect on plant-microbe-nutrient interactions, having a potential role in sustainable and resource efficient agriculture. en
dc.publisher ResearchSpace@Auckland en
dc.relation.ispartof Masters Thesis - University of Auckland en
dc.relation.isreferencedby UoA en
dc.rights Items in ResearchSpace are protected by copyright, with all rights reserved, unless otherwise indicated. Previously published items are made available in accordance with the copyright policy of the publisher. en
dc.rights Restricted Item. Full Text is available to authenticated members of The University of Auckland only. en
dc.rights.uri https://researchspace.auckland.ac.nz/docs/uoa-docs/rights.htm en
dc.title Effects of Seawater Nutrients on Plant-Microbe Interactions en
dc.type Thesis en
thesis.degree.discipline Biological Sciences en
thesis.degree.grantor The University of Auckland en
thesis.degree.level Masters en
dc.rights.holder Copyright: The author en
pubs.elements-id 802189 en
pubs.record-created-at-source-date 2020-05-21 en

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