Soil Microbial Community Characteristics of Different Resistant Papayas were Analyzed by Biolog Eco Microplates
Papaya(Carica papaya L.)is an important tropical economic fruit,and papaya ring spot virus(PRSV)is one of the primary diseases of papaya plants,causing significant losses to the papaya industry.In this study,papaya varieties with field resistance to PRSV(HN)and susceptible papaya varieties(YK and NC)were used as research materials.Rhizosphere soils from resistant and susceptible plants were collected before the papaya was inoculated with the PRSV virus,and soil microbial communities were studied via the Biolog Eco microplate method.The results revealed that the AWCD values of the HN rhizosphere soil microorganisms were slightly higher than those of susceptible papaya varieties YK and NC.Diversity index analysis of the rhizosphere soil microbial community revealed significant differences between NC and YK,as well as between NC and HN,but no significant differences were detected between HN and YK.Principal component analysis showed that there were seven carbon sources with higher utilization by HN soil microorganisms:D-xylose,L-arginine,Tween-40,itaconic acid,glucose-1-phosphate,2-hydroxybenzoic acid,and D-malic acid.There are five carbon sources with high utilization by NC soil microorganisms:D-cellobiose,N-acetyl-D-glucosamine,γ-hydroxybutyric acid,L-threonine,and putrescine.There were four carbon sources with higher utilization by YK soil microorganisms:pyruvic acid methyl ester,i-erythritol,α-ketobutyric acid,and L-asparagine.These results indicated that the rhizosphere soil microorganisms of resistant papaya and susceptible papayas were specific in utilizing these carbon sources,and long-term cultivation may lead to changes in the function of microbial communities,which may affect the resistance of papaya to virus damage.
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