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Visualization of symbiotic tissue in intact root nodules of Vicia tetrasperma using GFP-marked Rhizobium leguminosarum bv. viciae

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Abstract

In rhizobial symbiosis with legume plant hosts, the symbiotic tissue in the root nodules of indeterminate type is localized to the basal part of the nodule where the symbiotic zones contain infected cells (IC) interspersed with uninfected cells (UC) that are devoid of rhizobia. Although IC are easily distinguished in nodule sections using standard histochemical techniques, their observation in intact nodules is hampered by nodule tissue characteristics. Tagging of Rhizobium leguminosarum bv. viciae strain 128C30 with a constitutively expressed gene for green fluorescent protein (nonshifted mutant form cycle3) in combination with the advantages of the tiny nodules formed by Vicia tetrasperma (L.) Schreb. allowed for vital observation of symbiotic tissue using fluorescence microscopy. Separation of a red-shifted background channel and digital image stacking along z-axis enabled us to construct a nodule image in a classical fluorescence microscopy of nodules exceeding 1 mm in diameter. In parallel, visualization of nodule bacteria inside the symbiotic tissue by confocal microscopy at the excitation wavelength 488 nm clearly distinguished IC/UC pattern in the nodule virtual sections and revealed red-shifted fluorescence of nonrhizobial origin. This signal was located on the periphery of IC and increased with their degradation, thus suggesting accumulation of secondary metabolites, presumably flavonoids. The simultaneous detection of bacteria and secondary metabolites can be used for monitoring changes to intact nodule physiology in the model legumes. The advantage of V. tetrasperma as a suggested laboratory model for pea cross-inoculation group has been demonstrated.

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Abbreviations

GFP:

green fluorescent protein

IC:

infected cells

UC:

uninfected cells

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  1. Institute of Microbiology, Academy of Sciences of the Czech Republic, 142 20, Prague, Czechia

    P. Chovanec, O. Hovorka & K. Novák

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  1. P. Chovanec
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  2. O. Hovorka
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  3. K. Novák
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Correspondence to K. Novák.

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Chovanec, P., Hovorka, O. & Novák, K. Visualization of symbiotic tissue in intact root nodules of Vicia tetrasperma using GFP-marked Rhizobium leguminosarum bv. viciae . Folia Microbiol 53, 139–146 (2008). https://doi.org/10.1007/s12223-008-0020-3

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