Hormonal control of tobacco protoplast nucleic acid metabolism during in vitro culture |
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Authors: | R. Cooke Y. Meyer |
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Affiliation: | (1) Laboratoire de Physiologie Végétale, Université de Perpignan, Avenue de Villeneuve, F-66025 Perpignan Cedex, France |
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Abstract: | 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.Abbreviations 6-BA 6-benzyladenine - 2,4-D 2,4 dichlorophenoxyacetic acid - DPC diethylpyrocarbonate - OD optical density; oligo-dT cellulose-oligothymidylic acid-cellulose - poly A+ RNA polyadenylated RNA - poly A- RNA non-polyadenylated RNA - tRNA ribosomal RNA - SDS sodium dodecyl sulphate - TCA trichloroacetic acid - Tris buffer Tris (hydroxymethyl)aminomethane - tRNA transfer RNA |
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Keywords: | Auxin Cytokinin DNA Nicotiana RNA Protoplasts |
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