ISSN:
1573-5087
Keywords:
Lycopersicon esculentum
;
adenine
;
cytokinin synthesis
;
cell-free extracts
;
root sap
Source:
Springer Online Journal Archives 1860-2000
Topics:
Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
Notes:
Abstract The incorporation of labelled adenine into cytokinin-like compounds was investigated in intact tomato plants, decapitated tomato roots and cell-free root extracts. In all three cases evidence was found for the incorporation of adenine into endogenous cytokinins. In intact plants and decapitated root systems no evidence was found for the incorporation into cytokinin nucleotides. Cytokinin bases and nucleosides were however, labelled. In the cell-free root extract there was some evidence for the incorporation of labelled adenine into cytokinin nucleotides. This suggests that the biosynthetic process may be strictly compartmentalized. The present results provide no evidence for the relative importance of cytokinin nucleotides in the biosynthetic process. What is clear is that the rate of adenine incorporation into cytokinins is extremely low and that only a small proportion of the cytokinins which became labelled were exported to the shoot via the root exudate.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00024932
Permalink