The induction of cytokinin habituation in primary pith explants of tobacco View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

1980-01

AUTHORS

Frederick Meins, Joseph Lutz

ABSTRACT

Pith parenchyma tissue ofNicotiana tabacum L. cv. “Havana 425” becomes cytokinin habituated when incubated at 35°C on an auxin-containing medium. Under these conditions, habituated, hyperplastic nodules appear on the tissues. We used these nodules to estimate the incidence of habituation by a statistical method. The rate of habituation varied with the season. Tissue isolated from plants in the spring habituated approx. 7 times faster than did tissue isolated from plants in winter. The fact that the average rate, >4×10−3 per cell generation, was 100–1,000 times faster than the rate of somatic mutation inNicotiana species and depended on the physiological state of the tissue provides further evidence that habituation involves epigenetic changes rather than rare, random genetic mutations. We also found that kinetin (6-furfurylaminopurine) induced habituation and that the concentration required depended on the duration of cytokinin treatment. For long incubation times, approx. 6×10−10 M kinetin, which is about 1,000-fold lower than the concentration optimal for growth of cytokinin-requiring pith tissue, was sufficient to induce habituation. These results support the hypothesis that the habituated state is maintained by a positive feedback loop in which cytokinins either induce their own synthesis or inhibit their own degradation. More... »

PAGES

402-407

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/bf00571176

DOI

http://dx.doi.org/10.1007/bf00571176

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1022598038

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/24306378


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