Osciillating Ca2+ levels inside a growing root hair

This movie is of the tip of a growing root hair of the plant Arabidopsis thaliana (mouse ear cress). The plant has been engineered to produce a fluorescent protein in the cytoplasm whose brightness chanes as the Ca2+ levels in the cytoplasm change. Images of the root hair were taken using a confocal microscope and then the converted to a measurement of Ca2+ and colour coded using a rainbow scale, where blue is low and red high Ca2+ levels. The pulses in level are most likely part of an oscillator taht controls the rate of growth through using Ca2+ as an intracellular regulator.

For more research into this response see:
Monshausen et al (2008) Plant Physiology 147: 1690-1698

Cardenas (2009) Plant Signal Behav. 4:4-8