The role of plant growth promoting hormones in phytoplankton-bacteria interactions

Khalil, Abeeha

The role of plant growth promoting hormones in phytoplankton-bacteria interactions

Khalil, Abeeha

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Publication Type:: Thesis
Issue Date:: 2024

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Field	Value	Language
dc.contributor.author	Khalil, Abeeha
dc.date.accessioned	2026-01-12T03:57:00Z
dc.date.available	2026-01-12T03:57:00Z
dc.date.issued	2024
dc.identifier.uri	http://hdl.handle.net/10453/191646
dc.description	University of Technology Sydney. Faculty of Science.	en_US.UTF-8
dc.description.abstract	This thesis explores the role of plant growth promoting hormones (PGPHs) in shaping interactions between marine phytoplankton and heterotrophic bacteria. These microscale interactions within the ocean, can significantly influence phytoplankton growth impacting global biogeochemical cycles. Through a combination of genomic, chemical, and physiological experiments, this work demonstrates that a wide range of PGPHs previously known primarily from terrestrial systems, are produced by marine bacteria and can enhance phytoplankton growth. A CRISPR-Cas9 gene knockout approach was used to eliminate production of the hormone Indole-3-acetic acid (IAA) in a model bacterium, revealing that IAA was the primary metabolite responsible for promoting diatom growth. Global metagenomic analyses further showed that genes involved in PGPH production are widespread across the world’s oceans. These findings highlight the ecological relevance of PGPHs in marine systems and provide new insights into the chemical cross-talk at the base of aquatic food webs.	en_US.UTF-8
dc.format	Thesis (PhD)
dc.language.iso	en_US	en_US.UTF-8
dc.relation	https://opus.lib.uts.edu.au/bitstream/10453/191646/1/thesis.pdf
dc.rights	info:eu-repo/semantics/openAccess
dc.rights	The author owns the copyright in this thesis including all reproduction and reuse rights for the work. The work may not be altered without the permission of the copyright owner. Attribution is essential when quoting or paraphrasing from this thesis.
dc.rights	© 2024 Abeeha Khalil
dc.rights	au.edu.uts.lib/cph
dc.title	The role of plant growth promoting hormones in phytoplankton-bacteria interactions	en_US.UTF-8
dc.type	Thesis
utslib.copyright.status	open_access	*

Abstract:

This thesis explores the role of plant growth promoting hormones (PGPHs) in shaping interactions between marine phytoplankton and heterotrophic bacteria. These microscale interactions within the ocean, can significantly influence phytoplankton growth impacting global biogeochemical cycles. Through a combination of genomic, chemical, and physiological experiments, this work demonstrates that a wide range of PGPHs previously known primarily from terrestrial systems, are produced by marine bacteria and can enhance phytoplankton growth. A CRISPR-Cas9 gene knockout approach was used to eliminate production of the hormone Indole-3-acetic acid (IAA) in a model bacterium, revealing that IAA was the primary metabolite responsible for promoting diatom growth. Global metagenomic analyses further showed that genes involved in PGPH production are widespread across the world’s oceans. These findings highlight the ecological relevance of PGPHs in marine systems and provide new insights into the chemical cross-talk at the base of aquatic food webs.

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http://hdl.handle.net/10453/191646