Send to

Choose Destination
Planta. 1981 May;152(1):1-7. doi: 10.1007/BF00384976.

Hormonal control of tobacco protoplast nucleic acid metabolism during in vitro culture.

Author information

Laboratoire de Physiologie Végétale, Université de Perpignan, Avenue de Villeneuve, F-66025, Perpignan Cedex, France.


Tobacco mesophyll protoplasts cultivated in vitro do not synthesize a measurable quantity of chloroplastic ribosomal RNA, but actively synthesize cytoplasmic ribosomal RNA, polyadenylated RNA, and proteins. These syntheses are essentially independent of the presence of hormones in the culture medium and are thus related to the ageing phenomenon induced by isolation from the plant and in-vitro culture. At all stages of culture and in all culture media, protoplasts incorporate low levels of thymidine into their DNA. However, the incorporation of considerable quantities of thymidine, indicative of the S phase, only takes place after 25-30 h and requires the presence of auxin and cytokinin.


Supplemental Content

Loading ...
Support Center