pH fluxes around a growing root

Plants are hugely dynamic as they grow but you need some special tools to be able to visualize what is going on. This movie is of a growing root of the plant Arabidopsis thaliana (mouse ear cress). A pH-sensitive fluorescent dye has been added to the medium it is growing in. The dye becomes brighter as the acidity around the root is lowered and dimmer as the root acidifies its surroundings. These complex patterns of acidity reflect the active control the plant has of its surroundings and are related to the mechanisms that allow the root to grow through the soil as its cell elongate, a process known as "acid growth".

For more research into this response see:
Monshausen et al (2011) Plant Journal 65:309-618

Cosgrove (2005) Nature Reviews in Molecular and Cellular Biology 6:850-861