000 02331nam a22003497a 4500
001 G68365
003 MX-TxCIM
005 20211006073320.0
008 121211s ||||f| 0 p|p||0|| |
020 _a970-648-035-8
040 _aMX-TxCIM
072 0 _aH20
082 0 4 _a632.4
_bGIN
100 1 _aCunfer, B.M.
_uSeptoria and Stagonospora Diseases of Cereals: A Compilation of Global Research. Proceedings of International Workshop, 5. Mexico, D.F. (Mexico); 20-24 Sep 1999
110 2 _aCentro Internacional de Mejoramiento de Maiz y Trigo (CIMMYT), Mexico DF (Mexico)
245 0 0 _aStagonospora and septoria pathogens of cereals:
_b The infection process
260 _aMexico, DF (Mexico)
_bCIMMYT :
_c1999
340 _aPrinted
520 _aDefinitive 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.
546 _aEnglish
591 _a9910|AGRIS 0001
593 _aJose Juan Caballero
595 _aCPC
650 1 0 _aInfection
650 1 0 _aPathogens
_91197
650 1 7 _aPlant diseases
_gAGROVOC
_2
_91206
650 1 0 _aSeptoria
650 1 0 _aStagonospora
653 0 _aCIMMYT
700 1 _aGinkel, M. van|McNab, A.|Krupinsky, J.
_eeds.
942 _cPRO
999 _c4380
_d4380