The Quantitative Plant website is a comprehensive database of public datasets for plant phenotyping, image analysis software tools and models for plants.
A paper in JXB offers new way to analyse root networks. Reducing a root system to a graph might look like a step away from reality, but it allows for a lot of rapid high-quantity analysis of root systems.
Ribeiro et al. use a portable laser and a digital microscope to observe in situ biospeckle activity in roots of Zea mays, Jatropha curcas and Citrus limonia