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used similarity functions. This is a property of the
used intensity-based warping method. However, up
to now, it is more likely that the growth of the
structures in barley grains between the presented
timepoints is nonlinear. The landmark-based
approach shows a linear increase in terms of the
quality functions, but produces suboptimal results
after a given number of iterations.
The presented algorithm will serve as a tool for
further four-dimensional analysis of seed
development in barley: For further 4D analysis
expression data will be incorporated into the virtual
NMR datasets to visualize time-dependent
localization of e.g. metabolites during development.
For this task the presented iterative procedure
appears to be highly suitable for time-dependent
transformation of one development stage to another
and may prove to be a useful tool to make
morphological changes during seed development
accessible for further analysis.
ACKNOWLEDGEMENTS
This work was supported by a grant of the Deutsche
Forschungsgemeinschaft (DFG) (FKZ WE 1608/2-
1). We would like to thank Dr. Bernd Brückner (IfN
Magdeburg) for help with the calculations.
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