The dynamics of stomatal closure of Arabidopsis thaliana determined by terahertz spectroscopy and a water transport model
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Springer Nature
Abstract
Terahertz (THz) time-domain spectroscopy allows the detection of temporal changes of plant water
content in vivo and non-destructively, for example over the course of the day or at the onset of
drought stress. By studying a wildtype and a genetically modified variant of Arabidopsis thaliana,
we observed significant differences in their dehydration dynamics. For a better understanding of
the underlying processes, we modelled this behaviour with a simple rate equation model, compared
the results with the experimental data and correlated our model with the biological regulatory
mechanisms. In particular, under drought stress, we found an almost three times (2.80 ± 0.51) higher
maximal stomatal opening in the mutant than in the wildtype. Over the course of the day, the degree
of stomatal opening shows an exponential decrease with a half-life t1/2 of 12.3 ± 2.6 h in the wildtype
and 3.4 ± 0.8 h in the mutant.
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Except where otherwise noted, this item's license is described as Attribution 4.0 International