Summary
Cereal leaf protoplasts are extremely difficult to culture (recalcitrant) in vitro. There have been few reports of division and the protoplasts typically exhibit excessive enlargement and vacuolization with reduced cell wall deposition. Inasmuch as leaf base explants are capable of callus formation in vitro, protoplasts derived from this tissue must have lost the ability to divide as a consequence of changes induced by the wall-digestion process. We review evidence suggesting that the inhibition of mitosis in these protoplasts is a consequence of a cascade of events initiated at the plasma membrane. The enzyme treatment necessary for wall removal triggers membrane depolarization and other changes that can lead to the initiation of lipid peroxidation and oxidative stress. Mitotically inactive cereal leaf protoplasts are unable to mount a protective response to these degradative processes. Consequently, the resulting membrane perturbations and permeabilization give rise to secondary effects on the cytoskeleton and the cell wall. These effects include reduced or absent microtubules as well as reduced and uneven wall deposition. Such abnormalities are observed in cereal leaf protoplasts and are sufficient to account for recalcitrance because the occurrence of mitosis is strongly dependent on a normal cell wall and cytoskeleton.
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Cutler, A.J., Saleem, M. & Wang, H. Cereal protoplast recalcitrance. In Vitro Cell Dev Biol - Plant 27, 104–111 (1991). https://doi.org/10.1007/BF02632192
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DOI: https://doi.org/10.1007/BF02632192