University of Natural Resources and Life Sciences, Vienna (BOKU) - Research portal
Gewählte Master / Diploma Thesis:
Theresa Eichler
(2019):
Auswirkungen einer Inokulation von Tomatenpflanzen mit dem Wurzelendophyten Serendipita herbamans auf ausgewählte Lebensparameter der Gemeinen Spinnmilbe (Tetranychus urticae).
Master / Diploma Thesis - Institut für Pflanzenschutz,
BOKU-Universität für Bodenkultur,
pp 69.
UB BOKU
obvsg
- Abstract:
- The two-spotted spider mite Tetranychus urticae Koch (Acari: Tetranychidae) is a pest of various crops. Serendipita herbamans K. Riess, Oberw. & Garnica is a root endophyte of the Serendipitaceae family. Related species improve growth, nutrient supply and pathogen resistance of plants. However, their impact on herbivores has hardly been investigated. In this study the potential influence of an inoculation of tomato roots with S. herbamans on selected life-history parameters of T. urticae was determined in laboratory experiments. The experiments were conducted in two series. However, in none of the series root colonization with S. herbamans was observed. But since in other studies culture filtrate of a related endophyte had an impact on plant growth, root colonization might not be necessary for the fungus to cause effects in the plant. The results showed no significant influence of tomato inoculation with S. herbamans on life-history parameters of T. urticae observed in “single-leaf-arenas” (oviposition site preference, developmental time) and in “leaf-clip-cages” on leaves of whole plants (number of progeny within six days). Additionally, the inoculation had no distinct effect on plant growth. Only the shoot fresh weight of inoculated plants was raised significantly, whereas the shoot dry weight, root fresh weight and BBCH-stage were not significantly different from the control. However, a trend towards a positive effect of the inoculation on developmental time and the number of progeny of T. urticae was observed. Furthermore, the plants’ defense seemed to be negatively affected as a tendency towards a decreased total phenolic content in shoots of inoculated plants was found. This and a potential improvement of the plants’ nutrient acquisition by the fungus might be related to the positive trends in spider mite performance. Whether S. herbamans improves the nutrient supply of plants needs to be determined in further studies.
- Beurteilende*r: Koschier Elisabeth Helene
- 1.Mitwirkender: Hage-Ahmed Karin