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Infection Of Clover By Plant Growth Promoting Pseudomonas Fluorescens Strain 267 And Rhizobium Leguminosarum Bv. Trifolii Studied By MTn5-gusA

M. Marek-kozaczuk, J. Kopcińska, B. Łotocka, W. Golinowski, A. Skorupska
Published 2004 · Biology, Medicine

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Plant growth promoting Pseudomonas fluorescens strain 267, isolated from soil, produced pseudobactin A, 7-sulfonic acid derivatives of pseudobactin A and several B group vitamins. In coinoculation with Rhizobium leguminosarum bv. trifolii strain 24.1, strain 267 promoted clover growth and enhanced symbiotic nitrogen fixation under controlled conditions. To better understand the beneficial effect of P. fluorescens 267 on clover inoculated with rhizobia, the colonization of clover roots by mTn5-gusA marked bacteria was studied in single and mixed infections under controlled conditions. Histochemical assays combined with light and electron microscopy showed that P. fluorescens 267.4 (i) efficiently colonized clover root surface; (ii) was heterogeneously distributed along the roots without the preference to defined root zone; (iii) formed microcolonies on the surface of clover root epidermis; (iv) penetrated the first layer of the primary root cortex parenchyma and (v) colonized endophytically the inner root tissues of clover.
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