ISSN:
1432-2048
Keywords:
Key words: Arabidopsis (cell cycle) – Cell cycle – Cyclin – Embryogenesis – Gene expression (cyclin) – Phytohormones
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract. The associations of cyclins with highly conserved cyclin-dependent kinases are key events in the regulation of cell cycle progression. The spatio-temporal expression of an Arabidopsis thaliana (L.) Heynh. mitotic cyclin, Arath;CycA2;1, was studied by histochemical β-glucuronidase (GUS) analysis and in-situ hybridizations. The CycA2;1 promoter was active in the egg apparatus before fertilization. During embryogenesis, CycA2;1:gus expression was found in the embryo and the developing endosperm. Throughout plant development, CycA2;1 transcripts were found in both dividing and non-dividing cells, indicating that the expression of this cyclin is not a limiting factor for cell division. In the pericycle and stelar parenchyma, CycA2;1 transcripts were located at the xylem poles, a position that can be correlated with competence for lateral root formation. In addition, CycA2;1:gus expression was upregulated in roots by auxins and in the shoot apex by cytokinins. Transcription of CycA2;1 was shown by reverse transcription–polymerase chain reaction to be strongly induced by sucrose in A. thaliana cell suspensions.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/s004250000333
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