Nighttime Stomatal Conductance and Transpiration in C3 and C4 Plants

摘要

Incomplete stomatal closure during the night is observed in a diverse range of C3 and C4 species (Fig. 1 ; Supplemental Table S1) and can lead to substantial nighttime transpirational water loss. Although water loss is an inevitable consequence of stomatal opening for photosynthetic carbon gain, nighttime stomatal opening is unexpected because carbon gain is not occurring and the need to cool leaves is reduced or absent. Most species have the ability to close stomata more than is commonly observed at night, as demonstrated by reduced nighttime leaf conductance (gnight) in response to water stress, abscisic acid (ABA), and other treatments reviewed in this Update.