GENETIC MODELS CONCERNING PLANT RESISTANCE AT DISEASES WITH SPECIAL REFERRING TO POWDERY MILDEW PRODUCED BY BLUMERIA GRAMINIS F. SPEC. TRITICI PUBLISHEDGheorghe Popescu, Otilia Cotuna
Concerning plant resistance for diseases, respectively of the genes is activating as it follows: non-specific genes – non-specific resistance and specific genes – specific resistance, this classification being realised on the background of “genes functionality”. In this work are presented models of non-specific genetic resistance that has as models synthesis works “SA, JA, ethylene and disease resistance in plants” by XINIANG DONG and “Infection structures of biotrophic and hemibiotrophic fungal plant pathogens” by SARAH E. PERFECT, JONATHAN R. GREEN. Non-specific or conservative resistance is expressed with the help of plant phenotype with the help of a response of systemic acquired resistance – SAR and induced systemic resistance – ISR. SAR path that helps the plants to avoid diseasing with powdery mildew are: hypersensitive resistance (RH), salicylic acid (SA), jasmonic acid (JA), ethylene, calmodulin (CA ++ ) and perhydrole (H 2 O 2 ). ISR is a plant response for physiopathic factor, non-infectious and for the infectious factor. During 2003-2004 at S.C.D.A. Lovrin where implemented 27 wheat varieties in SAR and ISR and we have concluded next aspects: resistance is determined by non-specific genes and their activity are leading in time in wheat plant cells defensive proteins for pathogen factors (PR) preserved by PAMPs (Pathogen associated molecular patterns) and salvation as in case of physiopathic factors. These two variants (defending and curing) are implying to provide biological and organic wheat harvests, qualitative and quantitative.
genes; powdery mildew; specific and non-specific resistance; ethylene; calmodulin; perhydrole