Low humidity can cause uneven photosynthesis in olive (Olea europea L.) leaves.

@article{Loreto1990LowHC,
  title={Low humidity can cause uneven photosynthesis in olive (Olea europea L.) leaves.},
  author={F Loreto and Thomas D Sharkey},
  journal={Tree physiology},
  year={1990},
  volume={6 4},
  pages={409-15}
}
We examined the photosynthetic responses of olive (Olea europea L.) leaves exposed to either (a) two hours of high leaf-to-air vapor pressure difference (vpd) or (b) four 30-min cycles of high vpd separated by 15-min periods of recovery at low vpd. Neither treatment affected photosynthesis when vpd was less than 3.0 kPa. Photosynthesis by mature leaves was also insensitive to higher vpd, but photosynthesis of young leaves was reduced by both treatments at a vpd higher than 3.2 kPa. This effect… CONTINUE READING