Kinetin promotion of expansion growth and the rna synthesis in cucumber cucumis sativus cultivar monastyrski cotyledons

Legocka, J.; Waliszewska Wojtkowiak, B.; Okularczyk, J.; Gwozdz, E.A.; Szweykowska, A.

Acta Physiologiae Plantarum 6(4): 173-180


ISSN/ISBN: 0137-5881
Accession: 005785214

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Cotyledons excised from etiolated seedlings of C. sativus L. cv. Monastyriski were incubated in darkness in the absence or presence of 0.1 mM kinetin for 3-40 h. Expansion growth, RNA content and precursor incorporation into total RNA and RNA fractions were determined. A significant enhancement of the total RNA synthesis could be demonstrated after 24 h of the kinetin treatment. Kinetin promoted the synthesis of rRNA and low MW RNA. After a short 5 h kinetin treatment, a transient synthesis of an RNA fraction appeared in the polydisperse region of RNA spectrum which is believed to represent mRNA. A synthesis of mRNA at an early phase of the cytokinin treatment apparently is of importance for the growth response of the cotyledons.