Green callus obtained from leaves of the CAM-inducible plant Kalanchoe blossfeldiana cv. Montezuma has previously been shown to perform C3-type photosynthesis under 16-h days and to shift to crassulacean acid metabolism (CAM) under 9-h days. The utilization of photoperiodic regimes (i.e. night interruptions by 30 min red light) established that CAM induction in the callus was under the control of phytochrome, as shown by measurements of CAM criteria: phosphoenolpyruvate carboxylase activity and malic acid pools. Short-term responsiveness of the callus cells to phytochrome modulations by monochromatic radiations was also established by the rapid changes observed in the diameter of the callus-derived protoplasts. These results provide further evidence that whole plant correlations are not necessary for phytochrome operativity.
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crassulacean acid metabolism
phenylalanine ammonia lyase (EC 188.8.131.52)
photosynthetically active radiations
phosphoenolpyruvate carboxylase (EC 4.1.1. 31)
ribulose 1,5 bisphosphate carboxylase (EC 184.108.40.206)
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Communicated by A.M. Boudet
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Mricha, A., Brulfert, J., Pierre, J.N. et al. Phytochrome-mediated responses of cells and protoplasts of green calli obtained from the leaves of a CAM plant. Plant Cell Reports 8, 664–666 (1990). https://doi.org/10.1007/BF00269988
- Malic Acid
- Crassulacean Acid Metabolism
- Phosphoenolpyruvate Carboxylase
- Callus Cell