Plant Root Secretions and Their Interactions with Neighbors.- Root Exudates of Legume Plants and Their Involvement in Interactions with Rhizobia.- Flavonoids and Strigolactones in Root Exudates as Signals in Root-Fungus Interactions.- Plant Volatiles - Synthesis, Emission, Function.- Ligno-Cellulose Decomposition by Microbial Secretions.- Proteoid Roots and Exudation of Proteases by Plant Roots.- Unity is Strength: The Power of Border Cells and...