Summary
An improved method for the mechanical release of protoplasts from plant tissues is described. The historically-low yield of mechanically-released protoplasts is greatly increased by use of a simple electrically-driven tissue sheer and by optimization of various other steps in the procedure. As counted by light microscopy of a purified preparation, the number of mechanically-released protoplasts obtained is about 6×104 per gram fresh weight of cortical tissue from the primary root of maize (Zea mays L. WF9×Mo 17) seedlings. Nuclear staining of the preparation, however, shows that about half of these protoplasts lack a nucleus and thus are actually subprotoplasts. Comparison of lectin binding to the plasma membranes of mechanically-and enzymatically-released protoplasts shows that both types contain binding sites forRicinus communis agglutinin. Binding sites for peanut (Arachis hypogaea) agglutinin are not naturally present on mechanically-released protoplasts but are generated by exposure to a mixture of Cellulysin and Pectolyase Y-23, the cell wall-degrading enzymes used to prepare enzymatically-released protoplasts.
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Abbreviations
- BSA:
-
bovine serum albumin
- DDT:
-
dithiothreitol
- gfw:
-
gram fresh weight
- Mes:
-
2-(N-morpholino) ethanesulfonic acid
- PNA:
-
peanut (Arachis hypogaea) agglutinin
- RCA:
-
Ricinus communis agglutinin
- Tris:
-
tris(hydroxymethyl)aminomethane
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Sun, S., Furtula, V. & Nothnagel, E.A. Mechanical release and lectin labeling of maize root protoplasts. Protoplasma 169, 49–56 (1992). https://doi.org/10.1007/BF01343369
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DOI: https://doi.org/10.1007/BF01343369