Spike architecture traits associated with type II resistance to fusarium head blight in bread wheat

Fusarium head blight (FHB) remains a devastating disease in bread wheat (Triticum aestivum L.). Genetic resistance to FHB is complex; aside from active physiological resistance, plant developmental and morphological traits indirectly affect progression provide passive mechanism. Here, the relationship between Type II spike architecture was evaluated recombinant inbred line (RIL) population of field experiments during two crop seasons under completely randomized block design with replications. Point inoculation carried out at anthesis each RIL. Disease severity 21 days post (dpi), area progress curve (AUDPC) comprising measurements 12, 17 dpi, rachis length, density, number spikelets per spike, florets spikelet were determined. The showed significant variation for all traits. Heritability moderate-high (0.69) AUDPC (0.63) high (0.74–0.92). dpi significantly associated [r = 0.38 (P < 0.001) r 0.31 0.01) respectively] 0.28 0.27 0.05) respectively], reflecting greater spread fungus spikes higher floret number. These results suggest that should be considered breeding efforts, because selection lines could lead correlated response towards increased levels conditions.