Contents Summary 29 I. Introduction 29 II. Phloem as a conduit for macromolecules 30 III.
Classes of phloem transported RNAs and their function 32 IV. Mode of RNA transport 35 V …

Recent studies have revealed the operation of a long-distance communication network
operating within the vascular system of higher plants. The evolutionary development of this …

This review deals with aspects of the cellular and molecular biology of the sieve
element/companion cell complex, the functional unit of sieve tubes in angiosperms. It …

In 1879 Eduard Tangle discovered cytoplasmic connections between cells in the cotyledons
of Strychnos nuxvomica, which he interpreted to be protoplasmic contacts. This led him to …

Plants viruses spread throughout their hosts using a number of pathways, the most common
being movement cell to cell through plasmodesmata (PD), unique intercellular organelles of …

Plasmodesmata (PD) are thought to play a fundamental role in almost every aspect of plant
life, including normal growth, physiology, and developmental responses. However, how …

The evolution of intercellular communication had an important role in the increasing
complexity of both multicellular and supracellular organisms. Plasmodesmata, the …

A role for RNA as a non-cell-autonomous information macromolecule is emerging as a new
model in biology. Studies on higher plants have shown the operation of cell-to-cell and long …

CAPRICE (CPC), a small, R3-type Myb-like protein, is a positive regulator of root hair
development in Arabidopsis. Cell-to-cell movement of CPC is important for the differentiation …

Signaling centers within developing organs regulate morphogenesis in both plants and
animals. The putative transcription factor SHORT-ROOT (SHR) is an organizing signal …