Chlorophyll fluorescence of wheat leaves when infected with <i>Bipolaris sorokiniana</i>

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 apparatus level pre-symptom estimate cultivar resistance the pathogen. more resistant cultivars Novosibirskaya 29 Sibirskaya 21, invasion appeared be less expressed compared Novosibiskaya 41. More have smallest changes control ones. Sixteen seedlings infected with B. showed largest intercultivar differences. The activity during pathogenesis can used stress criterion selection material accelerate its sampling increase effectiveness early non-perspective sample rejection.