ISSN:
1573-5087
Keywords:
conjugates
;
cucumber
;
dedifferentiation
;
differentiation
;
2,4-dichlorophenoxyacetic acid
Source:
Springer Online Journal Archives 1860-2000
Topics:
Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
Notes:
Abstract The uptake, distribution and metabolism of 2,4-D using 14C-labelled 2,4-dichlorophenoxyacetic acid (14C-2,4-D) was studied in isolated hypocotyl and cotyledon explants of cucumber (Cucumis sativus L.) in vitro. Cotyledons had a higher uptake capacity than hypocotyls; the uptake in cotyledons increased linearly up to 20 h, while in hypocotyls only up to 8 h. The distribution of 14C-activity in both organs was basipetal, but more pronounced in cotyledons. The 2,4-D taken up by cotyledons was metabolized very rapidly: only 7% of 14C-activity was associated with free 2,4-D after 20 h exposure. Hypocotyls metabolized 2,4-D more slowly: after 20 h 50% of the 14C-activity was still associated with free 2,4-D. After short incubation periods (2–5 h) 2,4-D-aspartate was a predominant metabolite, after longer incubation (8–20 h) 2,4-D-glucosyl ester prevailed. Roots or callus were formed on the base of cotyledons depending on the length of exposure to 2,4-D.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1023/A:1006159021969
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