caa a22 4500 445840161 CHVBK 20180317145341.0 cr unu---uuuuu 170323e20110101xx s 000 0 eng 10.1007/s00709-010-0240-7 doi (NATIONALLICENCE)springer-10.1007/s00709-010-0240-7 Phloem loading, plant growth form, and climate [Elektronische Daten] [Anna Davidson, Felix Keller, Robert Turgeon] Plasmodesmatal frequencies in the phloem of leaf minor veins vary considerably, suggesting that photoassimilate is loaded into the phloem by different strategies. The ecophysiological basis for multiple loading types is unknown. We updated the analysis of van Bel and Gamalei (Plant Cell Environ 15: 265-270, 1992) with more current phylogenetic data and by treating separately two symplastic loading types, those that load actively by polymer trapping (synthesis of raffinose family oligosaccharides—RFOs), and those that load passively, by diffusion. The results indicate a stronger association between passive, symplastic loading and the tree growth form than previously recognized. Apoplastic loading is highly correlated with the herbaceous habit. There is no correlation between RFO families and growth form. At the family level, there are no correlations between minor vein types and climate that cannot be explained by the dearth of woody plants in the arctic for reasons unassociated with phloem loading. However, at the species level, a floristic analysis uncovered a correlation between the RFO trait and species frequency in tropical and subtropical regions of the world. The correlations between loading types and both growth form and climate are subtle, probably indirect, and poorly understood. Springer-Verlag, 2010 Intermediary cell nationallicence Onagraceae nationallicence Phloem loading nationallicence Plasmodesmata nationallicence Raffinose nationallicence Stachyose nationallicence Davidson Anna Department of Plant Biology, Cornell University, 14853, Ithaca, NY, USA aut Keller Felix Institute of Plant Biology, University of Zurich, 8008, Zurich, Switzerland aut Turgeon Robert Department of Plant Biology, Cornell University, 14853, Ithaca, NY, USA aut Protoplasma Springer Vienna 248/1(2011-01-01), 153-163 0033-183X 248:1<153 2011 248 709 https://doi.org/10.1007/s00709-010-0240-7 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00709-010-0240-7 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Davidson Anna Department of Plant Biology, Cornell University, 14853, Ithaca, NY, USA aut NATIONALLICENCE 700 1- Keller Felix Institute of Plant Biology, University of Zurich, 8008, Zurich, Switzerland aut NATIONALLICENCE 700 1- Turgeon Robert Department of Plant Biology, Cornell University, 14853, Ithaca, NY, USA aut NATIONALLICENCE 773 0- Protoplasma Springer Vienna 248/1(2011-01-01), 153-163 0033-183X 248:1<153 2011 248 709 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer