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In this study, quantitative real-time PCR (qPCR) was used to determine the amount of  Fusarium oxysporum , an important replant disease pathogen in  Pseudostellaria heterophylla  rhizospheric soil. Moreover, HPLC was used to identify phenolic acids in root exudates then it was further to explore the effects of the phenolic acid allelochemicals on the growth of  F. oxysporum  f.sp.  heterophylla . The amount of  F. oxysporum  increased significantly in  P. heterophylla  rhizosphere soil under a consecutive replant system as monitored through qPCR analysis. Furthermore, the growth of  F. oxysporum  f.sp.  heterophylla  mycelium was enhanced by root exudates with a maximum increase of 23.8%. In addition, the number of spores increased to a maximum of 12.5-fold. Some phenolic acids promoted the growth of  F. oxysporum  f.sp.  heterophylla  mycelium and spore production. Our study revealed that phenolic acids in the root secretion of  P. heterophylla  increased long with its development, which was closely related to changes in rhizospheric microorganisms. The population of pathogenic microorganisms such as  F. oxysporum  in the rhizosphere soil of  P. heterophylla  also sharply increased. Our results on plant-microbe communication will help to better clarify the cause of problems associated with  P. heterophylla  under consecutive monoculture treatment.

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Interaction of Pseudostellaria heterophylla with Fusarium oxysporum f.sp. heterophylla mediated by its root exudates in a consecutive monoculture system