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The occurrence of unusual laminated structures rich in β-1,4-glucans in plastids ofPhaseolus vulgaris root-nodule cells infected by an ineffective C4-dicarboxylic-acid mutant ofRhizobium leguminosarum bv.phaseoli

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Abstract

Root nodules induced inPhaseolus vulgaris L. by the wild-type (WT) and a C4-dicarboxylic-acid mutant strain ofRhizobium leguminosarum biovar.phaseoli were compared on the basis of ultrastructure and cytochemistry of cellulose subunits. The mutant bacteroids failed to colonize infected host cells in a normal manner, and presented a premature degenerative appearance. Starch granules, rough endoplasmic reticulum and mitochondria were found to accumulate in the ineffective nodules. The most striking difference between effective and ineffective nodules was the presence of unusual spherical, laminated structures in plastids of mutant-infected host cells only. Cytochemical observations showed that these structures containβ-1,4-glucans. The presence ofβ-1,4-glucans within such structures may be caused by the activity of a cellulase which is produced by either the bacteroids or the host cell and is locally hydrolyzing the host cell-wall, thus releasing cellulose subunits into the cytoplasm. Another possibility is denovo synthesis ofβ-1,4-glucans in the host cell.

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Abbreviations

PBS:

phosphate-buffered saline

PEG:

polyethylene glycol

PHB:

poly-β-hydroxybutyrate

RER:

rough endoplasmic reticulum

TTC:

2,3,5-triphenyl tetrazolium chloride

WT:

wild-type

B :

bacteroid

C :

cortex

Cy :

cytoplasm

CC :

central core

HCW :

host cell-wall

IC :

infected cell

IS :

inter-cellular space

LS :

laminated structure

N :

nucleus

P :

peroxisome

PHB :

poly-β-hydroxybutyrate

Pl :

plastid

PlM :

plastid matrix

PM :

peribacteroid membrane

RER :

rough endoplasmic reticulum

S :

starch grain

UC :

uninfected cell

Va :

vacuole

VB :

vascular bundle

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This work was supported by grants from the Natural Sciences and Engineering Research Council of Canada to H. Antoun and N. Benhamou. The authors are grateful to Dr. E.H. Newcomb, Department of Botany, University of Wisconsin, Madison, USA, for helpful comments on the interpretation of the micrographs. We also wish to thank S. Noël and H. Bissonnette for excellent technical assistance, Mrs. M. Pelchat for typing this manuscript, and Dr. G.B. Ouellette, Centre Forestier des Laurentides, Agriculture Canada, Sainte-Foy, Que., Canada, for the use of his light microscope. Printing for this paper was supported by the Conseil des recherches et services agricoles du Québec.

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Lafontaine, P.J., Benhamou, N. & Antoun, H. The occurrence of unusual laminated structures rich in β-1,4-glucans in plastids ofPhaseolus vulgaris root-nodule cells infected by an ineffective C4-dicarboxylic-acid mutant ofRhizobium leguminosarum bv.phaseoli . Planta 180, 312–323 (1990). https://doi.org/10.1007/BF01160386

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  • DOI: https://doi.org/10.1007/BF01160386

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