Plastid genes across the Great Divide : a thesis presented in partial fulfilment of the requirements for the degree of Doctor of Philosophy in Evolutionary Genetics/Bioinformatics, Institute of Fundamental Sciences, Massey University, Manawatu, New Zealand

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dc.contributor.authorCox, Simon James Lethbridge
dc.date.accessioned2016-04-07T01:48:05Z
dc.date.available2016-04-07T01:48:05Z
dc.date.issued2014
dc.description.abstractNearly all life that is visible to the naked eye is arguably a direct consequence of one or both endosymbiotic events that took place early in evolution and eventually resulted in the mitochondrion and the chloroplast. The timing of the mitochondrial endosymbiotic event weighs argument around the nature of LUCA (Last Universal Common Ancestor) being complex or simple and challenge the commonly taught view of bacteria being the first kingdom to emerge from the primordial state. The ancient metabolic pathways of amino acid and vitamin biosynthesis are examined and Ancestral Sequences constructed in order to discover the endosymbiotic signature within the nucleus of eukaryotes. Cyanobacterial and plant enzymes from these pathways are tracked as they cross from a prokaryotic coding environment to a eukaryotic one. If the eukaryote that took up the chloroplast ancestor was heterotrophic then it probably got some of its co-factors (vitamins) and essential amino acids from its diet. However, in order to become autotrophic it would have to be able to synthesise these amino acids and co-factors directly. The most likely source of these elements would have been the cyanobacterium; therefore cyanobacterial homologs should be found in the nuclear genome of plants. Ancestral Sequence Reconstruction (ASR) had a negligible effect on uncovering deeper endosymbiotic homologs. However ASR did confirm ancestral convergence between chloroplast and cyanobacterial homologs and between eukaryote nuclear genes and their cyanobacterial counterparts for vitamin and amino acid biosynthetic pathways. The results, all significant, show that the convergence is much stronger between organisms from the same coding environment (prokaryote [chloroplast] versus prokaryote [cyanobacteria]) than from different coding environments (eukaryote [nuclear] versus prokaryote [cyanobacteria]).en_US
dc.identifier.urihttp://hdl.handle.net/10179/7730
dc.language.isoenen_US
dc.publisherMassey Universityen_US
dc.rightsThe Authoren_US
dc.subjectPhylogenyen_US
dc.subjectMathematical methodsen_US
dc.subjectEvolutionary geneticsen_US
dc.titlePlastid genes across the Great Divide : a thesis presented in partial fulfilment of the requirements for the degree of Doctor of Philosophy in Evolutionary Genetics/Bioinformatics, Institute of Fundamental Sciences, Massey University, Manawatu, New Zealanden_US
dc.typeThesisen_US
massey.contributor.authorCox, Simon James Lethbridgeen_US
thesis.degree.disciplineEvolutionary Genetics/Bioinformaticsen_US
thesis.degree.grantorMassey Universityen_US
thesis.degree.levelDoctoralen_US
thesis.degree.nameDoctor of Philosophy (Ph.D.)en_US
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