The influence of the coherence of far-red (730 nm) light on the functional activity of plants was studied. Blackberry explants cultivated in vitro on an artificial nutrient medium served as a biological model. The explants were irradiated with light beams with different spatial and temporal coherence. The average cell size $D$ was taken as the discrimination threshold for the coherence length $L_{\mathrm{coh}}$ and the correlation radius $r_{\mathrm{cor}}$. The results of irradiation were judged by the length and number of shoots formed on each explant. The greatest photoinduced effect was observed when the conditions $L_{\mathrm{coh}}$, $r_{\mathrm{cor}}>D$ were fulfilled, i.e., when the cell fit completely in the coherence volume of the light wave field. Significant differences in growth parameters were also observed in the variants of the experiment with a constant frequency spectrum of radiation (fixed $L_{\mathrm{coh}}$), but different $r_{\mathrm{cor}}$. It is concluded that the correlation properties of radiation affect photoregulatory processes.

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• Cell signaling
• Optical coherence
• Processes in cells, tissues & organoids