Phloem

Gary A. Thompson is the Associate Dean for Research and Graduate Education, Director of the Pennsylvania Agricultural Experiment Station, and Professor of Plant Sciences in the College of Agricultural Sciences at Pennsylvania State University. Aart J. E. van Bel is Emeritus Professor and Head of the Department of General Botany and former Director of the Botanical Garden at Justus-Liebig-University.

Contributors vii

Section A Introduction 1

Chapter 1 Phloem, the Integrative Avenue 3
Aart J.E. van Bel and Gary A. Thompson

Chapter 2 Cell Biology of Sieve Element–Companion Cell Complexes 8
Rosemary G. White

Chapter 3 Fundamentals of Phloem Transport Physiology 30
John W. Patrick

Section B Functional Aspects of Structural SE Components 61

Chapter 4 Roles of Plasma Membrane Transporters in Phloem Functions 63
Mechthild Tegeder, Yong-Ling Ruan, and John W. Patrick

Chapter 5 Regulation of Sucrose Carrier Activities 102
Christina K¨uhn

Chapter 6 Cellular Basis of Electrical Potential Waves along the Phloem and Impact of Coincident Ca2+ Fluxes 122
Jens B. Hafke and Aart J.E. van Bel

Chapter 7 Sieve Element Occlusion 141
Michael Knoblauch and Daniel Mullendore

Section C Long-Distance Signaling 155

Chapter 8 Sieve Elements: Puzzling Activities Deciphered through Proteomics Studies 157
Sylvie Dinant and William J. Lucas

Chapter 9 Endogenous RNA Constituents of the Phloem and Their Possible Roles in Long-Distance Signaling 186
Julia Kehr and Anja Buhtz

Chapter 10 The Effect of Long-Distance Signaling on Development 209
David J. Hannapel

Chapter 11 Plant Defense and Long-Distance Signaling in the Phloem 227
Frank Gaupels and A. Corina Vlot

Section D Biotic Interactions with the Phloem 249

Chapter 12 Role of Phloem Metabolites in Plant Defense 251
Jillian M. Hagel, Akpevwe Onoyovwi, Edward C. Yeung, and Peter J. Facchini

Chapter 13 Viroids and Phloem-Limited Viruses: Unique Molecular Probes of Phloem Biology 271
Lucy R. Stewart, Biao Ding, and Bryce W. Falk

Chapter 14 Phytoplasmas and Spiroplasmas: The Phytopathogenic Mollicutes of the Phloem 293
Allyson M. MacLean and Saskia A. Hogenhout

Chapter 15 Breaching the Sieve Element—The Role of Saliva as the Molecular Interface between Aphids and the Phloem 310
Torsten Will, James C. Carolan, and Thomas L. Wilkinson

Chapter 16 Behavioral and Molecular-Genetic Basis of Resistance against Phloem-Feeding Insects 328
Linda L. Walling and Gary A. Thompson

Index 353

A color page section appears between pages 40 and 41