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Elucidation of Septoria tritici x Wheat Interactions Using GUS-Expressing Isolates
Phytopathology
|October 24, 2008
Summary
Genetic transformation of Septoria tritici using reporter genes allows for the study of fungal development in wheat. This method reveals differences in fungal biomass and protein content between wheat cultivars, impacting disease progression.
Area of Science:
- Plant Pathology
- Molecular Biology
- Agricultural Science
Background:
- Septoria tritici causes significant damage to wheat crops.
- Understanding fungal development and host interaction is crucial for disease management.
- Genetic transformation offers a tool to study fungal pathogens in planta.
Purpose of the Study:
- To genetically transform Septoria tritici isolates using reporter genes (uidA for beta-glucuronidase [GUS]) and selectable markers (hph for hygromycin B resistance [hygB]).
- To use GUS activity as a proxy for fungal biomass and protein content within wheat leaves.
- To elucidate fungal development dynamics and host interactions in different wheat cultivars.
Main Methods:
- Co-transformation of Septoria tritici isolates ISR398 and ISR8036 with hph and uidA genes.
- Selection of transformants resistant to hygromycin B (hygB(R)) and expressing GUS (GUS(+)).
- Fluorimetric determination of GUS activity using 4-methylumbelliferyl beta-D-glucuronide (MUG) to quantify fungal protein content in planta.
- Southern analysis to confirm gene integration and assess insertion sites.
Main Results:
- Transformed isolates showed similar pycnidial coverage to wild-type isolates.
- GUS activity correlated with fungal biomass, revealing increased fungal development in 'Shafir' compared to 'Seri 82'.
- Latent periods varied between cultivars and isolates, with 'Shafir' supporting faster fungal growth.
- Endogenous beta-1,4-D-glucuronidase activity was detected in wild-type inoculated leaves, but GUS-expressing transformants produced higher levels of 4-methylumbelliferone (MU).
Conclusions:
- Genetic transformation with GUS reporter gene is effective for monitoring Septoria tritici development in wheat.
- Fungal development and protein accumulation differ significantly between wheat cultivars 'Shafir' and 'Seri 82'.
- The host-pathogen interaction (compatible or incompatible) influences enzyme production and disease progression dynamics.
