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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.
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