Differential antioxidative responses of susceptible and resistant wheat cultivars against Fusarium head blight
Journal Title: International Journal of Farming and Allied Sciences - Year 2015, Vol 4, Issue 3
Abstract
Fusarium graminearum is an important disease globally that causes serious damages on crops particularly on wheat. Currently, the mechanisms underlying resistance to Fusarium head blight (FHB) are still unknown. To understand the host response to challenge by F.graminearum, we examined enzymatic activities in the wheat spikelet following inoculation with F.graminearum macroconidia. Greenhouse grown of two wheat cultivars Falat (susceptible) and Sumai3 (resistant) were inoculated by F.graminearum macronidia at the anthesis. Spikelets were harvested at 3, 5 and 7 days post inoculation (dpi). According to our results FHB infection in Sumi3 lead to significant increase of H2O2 and MDA contents as Falat but this induction was earlier in Sumi3. It seemed that increase in hydrogen peroxide in resistant genotypes was due to rapid induction of SOD (Superoxide dismutase) and decrease of CAT (Catalase) activity. Our results also indicated that POX (Peroxidase) and PPO (Polyphenol oxidase) activities were significantly increased in the resistant cultivar at 3 dpi, whereas increased activity of these enzymes was later in Falat at 5 and 7dpi. According to these results we suggest that rapid and more significant induction of antioxidative systems is the critical trait of wheat genotypes to resist FHB infection.
Authors and Affiliations
Mona Sorahinobar, Vahid Niknam, Hassan Ebrahimzadeh and Hassan Soltanloo
Keywords
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