For three spring wheat cultivars, characteristics of adaptive reaction to cereal root rot pathogen Bipolaris sorokiniana Shoem. infection are found by laboratory experiments using chlorophyll fluorecence parameter (ChlF) dynamics 10-16 day old seedlings. Such ChlF parameters as Y (II), ETR, qP, Fv / Fm, Fо, Y(NPQ), qN and Y(NQ) verified informative, being reliable biomarkers for photosynthetic ...