Study of different assessment methods of resistance to fusarium graminearum spread in wheat spikes

To study different assessment methods of resistance to spread of Fusarium head blight, the resistance of 28 genotypes of spring wheat (Triticium aestivum L.) was evaluated with 2 isolates of F. graminearum in the greenhouse by point injection method. Data for final disease rating, collected 28 days after inoculation, calculation of area under disease progress curve (AUDPC) based on disease scores on 7, 14, 21 and 28 days after inoculation and percentage of infected rachises, were statistically analyzed. For the three assessment methods variation among genotypes was significant. Significant correlation among 3 assessment methods indicates that these methods measured the same basic process of disease spreading within the head. The similarity of resistant evaluation results based on diseased spikelets. Final disease rating and AUDPC and rachis infection, indicated that rachis is the most important barrier for Fusarium spread in wheat spikes.