The relationship between the bacterial community in wheat root and the occurrence of wheat yellow mosaic disease
Microbial communities within plant root systems play significant roles in host growth and develop-ment,nutrient absorption,and disease resistance.To investigate the correlation between changes in the wheat root microbiome and the occurrence of wheat yellow mosaic,and consequently seek biological control methods for wheat yellow mosaic,this study collected wheat root samples that are healthy(H),moderately infected(M),and severely infected(S).The bacterial community structures within the wheat roots under varying de-grees of infection and their environmental driving mechanisms were studied.Results revealed that as the degree of infection increased,the richness of bacterial communities within the wheat roots showed a declining trend.Bacterial community structures significantly differentiated among varying degrees of infection and were related to changes in the nutrient content of rhizosphere soil.Specifically,the genera Curtobacterium,Rhizobium,Meso-rhizobium,Sphingomonas,and Luteibacter were enriched in infected wheat roots,and their relative abundance was positively correlated with the nitrate nitrogen(NO3-N),available phosphorus(AP),organic carbon(SOC),total phosphorus(TP),total potassium(TK),and plant carbon(PC)content in the rhizosphere soil,but negatively correlated with ammonium nitrogen(NH4+-N)and magnesium(Mg)content.The genus Pantoea was enriched in healthy wheat roots,and its relative abundance was positively correlated with plant nitrogen(PN)content.These findings indicate that changes in the bacterial community structure within wheat roots are related to the occurrence of wheat yellow mosaic and the increase in nutrient content in the rhizosphere soil.
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