Abstract
Relationships between mineral uptake and tobacco shoot organogenesis were investigated during three morphogenic phases: phase 1, days 0–10, pre-meristem formation; phase 2, days 10–20, meristem initiation and formation; and phase 3, days 20–35, growth and differentiation of induced meristems into leafy shoots. The mineral content of both shoot-forming (SF) and non-shoot-forming (NSF) media was examined over the 35-day culture period. Both SF and NSF explants rapidly consumed iron during phase 1. Nitrate uptake in SF explants was high and independent of explant growth during phases 1 and 2, but greatest and strongly correlated with growth during phase 3. Phosphorus uptake was highest in SF explants during phases 2 and 3, and correlated with explant growth. Uptake of potassium, calcium and sulphur was strongly associated with explant growth during phase 3 whereas magnesium uptake was only poorly correlated with growth. Results from this study indicate that particular minerals may have an important role in regulating development as well as generally supporting growth.
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Abbreviations
- BA :
-
N 6-Benzyladenine
- NSF :
-
Non-shoot forming
- RGR :
-
Relative growth rate
- SF :
-
Shoot forming
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Acknowledgements
We would like to thank the technical staff of the School of Agronomy and Horticulture. This research was supported by a University of Queensland Collaborative Research Grant number 97/QUALR3018G.
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Communicated by R.F. Rose
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Ramage, C.M., Williams, R.R. Mineral uptake in tobacco leaf discs during different developmental stages of shoot organogenesis. Plant Cell Rep 21, 1047–1053 (2003). https://doi.org/10.1007/s00299-003-0628-3
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DOI: https://doi.org/10.1007/s00299-003-0628-3