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000061035 084__ $$2WoS$$aPlant Sciences
000061035 1001_ $$0P:(DE-HGF)0$$aBücking, H.$$b0
000061035 245__ $$aThe fungal sheath of ectomycorrhizal pine roots : an apoplastic barrier for the entry of calcium, magnesium, and potassium into the root cortex?
000061035 260__ $$aOxford$$bUniv. Press$$c2002
000061035 300__ $$a1659 - 1669
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000061035 440_0 $$03318$$aJournal of Experimental Botany$$v53$$x0022-0957
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000061035 520__ $$aThe apoplastic permeability of the fungal sheath of two different ectomycorrhizal associations of Pinus sylvestris L. was analysed by laser microprobe mass analysis (LAMMA) and energy-dispersive X-ray spectroscopy (EDXS) after stable isotope labelling with Mg-25, K-41 and Ca-44. Entry of Mg-25 and Ca-41 into the outer cortical apoplast of non-mycorrhizal roots was detected after 4 min of labelling. After a longer exposure time the endodermis with its Casparian band acted as an efficient apoplastic diffusion barrier for the radial movement of Mg-25 and Ca-44 into the stele. A fraction of approximately one-third of the apoplastic cations of the root cortex could not be exchanged against the external label even after longer exposure times. The ectomycorrhizal sheath of the two fungal species used, Pisolithus tinctorius (Pers.) Coker & Couch and Suillus bovinus (L. ex Fr.) Kuntze, does not completely inhibit the apoplastic movement of ions into the mycorrhizal root cortex, but retarded the penetration of isotopes into the cortical apoplast. In roots inoculated with S. bovinus, a clear labelling of the cortical apoplast could first be detected after 24 h of exposure to the stable isotope solution. At this time the labelling of the cortical apoplast in these mycorrhizal roots was higher than those of non-mycorrhizal roots and, with EDXS, changes in the element composition of the apoplast were detected. The results indicated that possibly hydrophobins localized in the fungal cell wall might be involved in the increased hydrophobicity of mycorrhizal roots and the lower permeability of the ectomycorrhizal sheath.
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000061035 65320 $$2Author$$aapoplastic movement
000061035 65320 $$2Author$$aectomycorrhiza
000061035 65320 $$2Author$$aendodermis
000061035 65320 $$2Author$$aLAMMA
000061035 65320 $$2Author$$aPinus sylvestris
000061035 7001_ $$0P:(DE-Juel1)129349$$aKuhn, A. J.$$b1$$uFZJ
000061035 7001_ $$0P:(DE-Juel1)VDB1472$$aSchröder, W. H.$$b2$$uFZJ
000061035 7001_ $$0P:(DE-HGF)0$$aHeyser, W.$$b3
000061035 773__ $$0PERI:(DE-600)1466717-4$$a10.1093/jxb/erf011$$gVol. 53, p. 1659 - 1669$$p1659 - 1669$$q53<1659 - 1669$$tThe @journal of experimental botany$$v53$$x0022-0957$$y2002
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