The occurrence and ecological role of plasmids in

The occurrence and ecological role of plasmids in
bacterial mycosphere dwellers
Miaozhi Zhang
2015
The research presented in this book was carried out at the Department of Microbial Ecology,
Centre for Ecological and Evolutionary Studies (CEES), University of Groningen, The
Netherlands. The candidate was financially supported by Chinese Scholarship Council (CSC),
China.
Cover design: Miaozhi Zhang, Jolanda Brons
Cover picture: Starry Night-Vincent Willem van Gogh ,1853-1890 (Image of public domain)
Printed: CPI, Koninkijke Wohrmann, The Netherlands
ISBN: 978-90-367-7687-5 (book)
ISBN: 978-90-367-7686-8 (electronic version)
The occurrence and ecological
role of plasmids in bacterial
mycosphere dwellers
Proefschrift
ter verkrijging van de graad van doctor aan de
Rijksuniversiteit Groningen
op gezag van de
rector magnificus prof. dr. E. Sterken
en volgens besluit van het College voor Promoties.
De openbare verdediging zal plaatsvinden op
maandag 9 maart 2015 om 12.45 uur
door
Miaozhi Zhang
geboren op 27 Juni 1983
te Liaoning, China
Promotor
Prof. dr. ir. J.D. van Elsas
Beoordelingscommissie
Prof. dr. S. J. Sørensen
Prof. dr. W. de Boer
Prof. dr. J. Kok
Contents
Chapter 1
Scope of the thesis
Chapter 2
The mycosphere constitutes an arena for horizontal gene
transfer with strong evolutionary implications for bacterialfungal interactions
15
Chapter 3
IncP-1β plasmids are important carriers of fitness traits for
Variovorax species in the mycosphere – two novel plasmids,
pHB44 and pBS64, with differential effects unveiled
37
Chapter 4
The complete sequences of two IncP-1β plasmids, isolated from
the mycosphere of Laccaria proxima
65
Chapter 5
The putative effect of IncP-1β plasmid pHB44 on the iron
uptake capacity of Burkholderia terrae BS001 and its potential
transfer in soil microcosms
87
Chapter 6
IncP-1 and PromA group plasmids are major providers of
horizontal gene transfer capacities across bacteria in the
mycosphere of different soil fungi
109
Chapter 7
The draft genomes of two plasmids that were exogenously
isolated from the mycosphere
133
Chapter 8
General discussion, conclusions and future perspectives
153
Appendix
165
Summary
173
Nederlandse samenvatting
175
Chinese summary
177
Acknowledgements
179
7

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