Abstract
Phloem: the integrative avenue for resource distribution, signaling, and defense.
Highlights
Research over the past 20 years has revealed new functions of the phloem beyond resource allocation to a system that combines distribution and messaging (Thompson and van Bel, 2013) analogous to the circulatory and nervous systems in animals
Vascular development partly depends on environmental cues that have impacted the evolution of vascular systems and phloem transport mechanisms
A novel phylogenetic approach to identify genes involved in vascular development (Martinez-Navarro et al, 2013) shows that several vascular genes are expressed in green algae (Chlorophyta), the ancestors of land plants
Summary
Research over the past 20 years has revealed new functions of the phloem beyond resource allocation to a system that combines distribution and messaging (Thompson and van Bel, 2013) analogous to the circulatory and nervous systems in animals. Differentiation and development of vascular cells is complex and not well understood. A novel phylogenetic approach to identify genes involved in vascular development (Martinez-Navarro et al, 2013) shows that several vascular genes are expressed in green algae (Chlorophyta), the ancestors of land plants.
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