Optional use of CAM photosynthesis in two C4 species, Portulaca cyclophylla and Portulaca digyna.

@article{Holtum2017OptionalUO,
  title={Optional use of CAM photosynthesis in two C4 species, Portulaca cyclophylla and Portulaca digyna.},
  author={Joseph A M Holtum and Lillian P Hancock and Erika J. Edwards and Klaus Winter},
  journal={Journal of plant physiology},
  year={2017},
  volume={214},
  pages={91-96}
}
Low levels of crassulacean acid metabolism (CAM) are demonstrated in two species with C4 photosynthesis, Portulaca cyclophylla and P. digyna. The expression of CAM in P. cyclophylla and P. digyna is facultative, i.e. optional. Well-watered plants did not accumulate acid at night and exhibited gas-exchange patterns consistent with C4 photosynthesis. CAM-type nocturnal acidification was reversible in that it was induced following drought and lost when droughted plants were rewatered. In P… CONTINUE READING
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