Biotic regulation: plants.

Abstract

An account is given on: root growth and root system architecture (components and developmental processes, root growth, tropisms and hormonal control); interactions between plant roots and the soil environment (root growth in response to soil environmental conditions, and effect of root growth and development on soil properties); and the importance of plant roots at the community scale (interactions between roots and root systems in multi-species systems, agronomic implications of multi-specific systems, and impact of root communities on climate).