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Rhizosphere persistence of three Pythium oligandrum strains in tomato soilless culture assessed by DNA macroarrayand real-time PCR

Abstract : In tomato soilless culture, plant-disease optimal control and growth promotion are achieved when the rhizosphere is heavily colonized by the biocontrol agent Pythium oligandrum. Discrepancies in performance are generally attributed to the poor persistence of P. oligandrum on roots. In this study, three selected strains of P. oligandrum were introduced into the rhizosphere of greenhouse-grown tomato plants, and their persistence was assessed by DNA macroarray hybridization and real-time PCR. The experimental data from DNA detection and plate counting were compared. PCR-based methods detected P. oligandrum throughout the 6-month growing season, whereas plate counting indicated its presence only over the first 3 months. Moreover, the DNA array method provided information about the various Pythium species present in the rhizosphere: P. dissotocum was frequently detected on roots of plants, without distinction between plants inoculated or not inoculated with the antagonist. The detection of other Pythium species was noticed sporadically (P. ultimum, P. sylvaticum and P. intermedium), independent of the treatment. Even though the yield enhancement is not significant throughout the entire growing season, data obtained from epidemiological studies demonstrate an enhancement of P. oligandrum persistence on the rhizosphere of plants and less use of mycoparasitism.
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https://hal.univ-brest.fr/hal-00554952
Contributor : Violaine Garguilo <>
Submitted on : Tuesday, January 11, 2011 - 6:12:29 PM
Last modification on : Wednesday, June 24, 2020 - 12:16:02 PM

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Gaétan Le Floch, James Tambong, Jessica Vallance, Yves Tirilly, André Lévesque, et al.. Rhizosphere persistence of three Pythium oligandrum strains in tomato soilless culture assessed by DNA macroarrayand real-time PCR. FEMS Microbiology Ecology, Wiley-Blackwell, 2007, 61 (2), pp.317-326. ⟨10.1111/j.1574-6941.2007.00348.x⟩. ⟨hal-00554952⟩

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