Abstract
Stomata are probably the most important orifices on the planet, and not only as mediators of gaseous exchange in plants. The millennia-old inverse relationship between CO2 levels and stomatal density is useful in attempts to understand the effects of elevated atmospheric CO2 levels. Although increased CO2 concentrations can enhance plant growth, there is concern that CO2 levels could increase to a point when stomatal density reaches zero, with dire consequences for all life on Earth. However, the discovery of the Arabidopsis HIC (high carbon dioxide) gene by Julian Gray and colleagues [Nature (2000) 408, 713–716], whose product prevents further enhanced-CO2-changes in stomatal number, suggests that this fear might be premature.
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