Table 2.

Parameters used in the modeling.

Parameter	Interval studied	Comment and/or reference
Diffusion coefficient	D = 10−9 m2 s−1 = 103 μm2 s−1	For diffusion in aqueous buffer D = 1.7 × 10−9 m2s-1 (van Stroe-Biezen et al., 1993); molecular crowding decreases D by approx. 20–50% (Straube and Ridgway, 2009)
Frequency	0.01–1 Hz	Assumed to lie in the same range as for Ca2+ (Jaffe, 1993)
Distance from source to target	1–10 μm	Typical cellular distances
Size of area on PM emitting synchronized pulse	Single channel – 10 μm × 10 μm	Relevant cellular dimensions
Assumed peak/trough ratio required to transmit signal	10–100-fold
Minimal detection concentration	1–100 μM	Lower boundary is ten times the min. Ca2+ concentration measured in animal cells (Alberts et al., 1994); upper boundary is at the lower end of the average concentration measured in plant cells (Møller et al., 2007)
Maximal flux through a membrane channel	109 molecules s−1 channel−1 = 1.7 × 10−15 mol s−1 channel−1	Total flux for both water and H2O2
Channel density	ρa = 30 channel μm−2	Li et al. (2011)
Maximal H2O2 flux per μm2	10−16 mol μm−2s−1	Calculated using the maximal flux and the channel density and assuming no selectivity of the channels
Maximal degradation rate	Vmax = 1–100 μM s−1	Lowest level estimated from Bonifacio et al. (2011)
Michaelis constant	20 μM for H2O2, values in the range 2–200 μM are considered	20 μM is the average for ascorbate peroxidases reviewed in Raven (2003)
Cytoplasmic streaming speed	1–100 μm s−1	Goldstein et al. (2008)
Cytoplasmic stream width	1–10 μm	Kristiansen et al. (2009)