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Pathogenesis, Virulence And Population Genetics Of Puccinia Emaculata, The Causal Agent Of Switchgrass Rust, Qunkang Cheng
Pathogenesis, Virulence And Population Genetics Of Puccinia Emaculata, The Causal Agent Of Switchgrass Rust, Qunkang Cheng
Doctoral Dissertations
The infection process of Puccinia emaculata on Panicum virgatum leaves was studied histologically. Appressoria were formed approximately 10 hr after inoculation and penetrations were observed over stomatal openings. Substomatal vesicles developed 3 days after inoculation (DAI) and at 5 DAI, both haustorial mother cells and haustoria were observed. At 11 DAI, uredinia were developing, but urediniospores were immature. Until 14 DAI, matured uredinia ruptured host epidermis and urediniospores were released for secondary infection. This clearly studied infection process will help understand resistance mechanisms of a resistant cultivar in future research.
Twelve agronomic and ornamental switchgrass cultivars were inoculated with 40 …