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INTERACTIONS BETWEEN FLUORESCENT PSEUDOMONADS AND VA MYCORRHIZAL FUNGI
Citation:
Paulitz, T. AND R. Linderman. INTERACTIONS BETWEEN FLUORESCENT PSEUDOMONADS AND VA MYCORRHIZAL FUNGI. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/J-93/036 (NTIS PB93158905), 1989.
Description:
Cucumber seeds were treated with rifampin-resistant derivatives of Pseudomonas puntida (A12, N1R or R-20) or P. fluorescens (2-79 or 3871) and planted in soils with and without added inoculum of the VA mycorrhizal fungi Glomus intraradices Schenck & Smith or G. etunicatum Becker & Gerdemann. Populations of Pserndomonas spp. in the combined rhizosphere-rhizoplane soil were determined at 1-9 weeks after planting by dilution plating on a selective medium. t 1-3 weeks, the populations of all strains except R-20 were 1.5 to 7 times lower in the rhizosphere of cucumber roots colonized by G.incraradices, when compared to nonmycorrhizal plants. owever, this effect was less consistent in 3- to 9-week-old plants. No significant difference was detected in populations of Pseudomonaz strains between roots colonized by G. etuncatum and nonmycorrhizal roots. Strains 3871 and 2-79, which are antibiotic producers, delayed the germination of G. etunicatum spores in raw soil, but by seven days no significant differences in frequency of germination were detected. one of the fluorescent Pserndomonas strains affected the colonization of cucumber roots by G.etunicatum.
