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Effects of the endophyte Piriformospora indica on growth, physiology and water relations of tobacco (Nicotiana tobacum) Open Access


Other title
hydraulic conductance
water relations
Piriformospora indica
Type of item
Degree grantor
University of Alberta
Author or creator
Ferster, Frances G
Supervisor and department
Zwiazek, Janusz (Department of Renewable Resources)
Examining committee member and department
Hacke, Uwe (Department of Renewable Resources)
Cooke, Janice (Department of Biological Sciences)
Department of Renewable Resources
Forest Biology and Management
Date accepted
Graduation date
Master of Science
Degree level
In the current study, wildtype and transgenic tobacco constitutively over-expressing Arabidopsis aquaporins PIP 1;4 and PIP 2;5 were grown in association with the endophyte Piriformospora indica. Root hydraulic conductivity along with various physiological parameters and aquaporin expression were studied in conjunction with growth. Growth promotion was observed in inoculated wildtype and PIP 2;5 over-expression plants, while water relation parameters were not observed to change in any of the genotypes. Quantified expression levels of four aquaporins were not changed in inoculated wildtype plants; however immunolocalization techniques revealed a possible increase in PIP 1 aquaporins in exodermal tissues of the associated plants. It was concluded that the growth promoting benefits of the fungus were due to factors other than influencing water relations and modulation of aquaporins studied. Moreover, it was interpreted that PIP 1;4 over-expression may inhibit growth promotion in inoculated plants, although the mechanisms of that role remains unclear.
Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
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