Abstract

Light quality, drives several photomorphogenetic responses in plants such as leaf growth. A decrease in blue irradiance in the incident light leads to an increase in leaf elongation rate and final leaf length. The effects of blue light could be mediated by water flux into the growing zone since blue light has a direct effect on stomata aperture and consequently on plant transpiration. Indeed, several studies have demonstrated the effects of changes in transpiration rate on leaf elongation rate but little is known about the control of leaf elongation by water flux under low blue light conditions.

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