Identification of Fusarium head blight resistance and analysis of toxin accumulation in major rice varieties in Jiangsu Province
In 2021 and 2022,the resistance level of 16 major rice varieties to Fusarium head blight(FHB)in Jiangsu Province was evaluated under artificial and natural infection conditions.Meanwhile,the accumulation level of trichothecenes,including nivalenol,deoxynivalenol,3-acetyldeoxynivalenol,15-acetyldeoxynivalenol,and fusarenone X,was also detected in these rice varieties.The results showed that 9 rice varieties,including 4 japonica varieties and 5 indica varieties,were moderately resistant to FHB under artificial infection conditions,and the resistance of different rice varieties to FHB in 2021 was consistent with that in 2022,with indica varieties showing significantly higher resistance to FHB than japonica varieties(P＜0.05).However,under natural infec-tion in the field,the resistance of different rice varieties to FHB was quite different between 2021 and 2022,and the result was also different from that obtained under artificial infection conditions.In addition,the resistance of indica rice varieties to FHB was also higher than that of japonica varieties.Moreover,the accumulation level of trichothecenes was different among various rice varieties,and there was a significantly positive correlation between trichothecene content and disease index(P＜0.01).Our results reveal the resistance of main rice varieties to FHB in Jiangsu Province,making the basis for evaluation of resistance level of rice varieties against FHB and breeding and deployment of FHB-resistant rice varieties.
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