Stagonospora and septoria pathogens of cereals: The infection process
Material type: TextPublication details: Mexico, DF (Mexico) CIMMYT : 1999ISBN:- 970-648-035-8
- 632.4 GIN
Item type | Current library | Collection | Call number | Copy number | Status | Date due | Barcode | Item holds | |
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Conference proceedings | CIMMYT Knowledge Center: John Woolston Library | CIMMYT Publications Collection | 632.4 GIN (Browse shelf(Opens below)) | 1 | Available | I628903 |
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Definitive information on the infection process has been reported for Stagonospora nodorum, Septoria tritici, and Septoria passerinii. Like other necrotrophic pathogens, they do not elicit the hypersensitive reaction. A significant difference in the infection process between Septoria and Stagonospora pathogens is that spore germination and penetration proceed much faster for S. nodorum than for S. tritici and S. passerinii. The Septoria pathogens penetrate the leaf primarily through stomata, whereas S. nodorum penetrates both directly and through stomata. Stagonospora nodorum kills the epidermal cells quickly, but S. tritici and S. passerinii do not kill epidermal cells until hyphae have ramified through the leaf mesophyll and rapid necrosis begins. Resistance slows host colonization but has no appreciable effect on the process of lesion development. The mechanisms controlling host response are still unclear. The infection process for ascospores is probably very similar to that for pycnidiospores. Ascospores of Phaeosphaeria nodorum germinate over a wide range of temperatures and their germ tubes penetrate the leaf directly. However, unlike pycnidiospores, the ascospores do not germinate in free water.
English
9910|AGRIS 0001
Jose Juan Caballero
CIMMYT Publications Collection