Aquorin Bioluminescence-Based Ca<sup>2+</sup> Imaging Reveals Differential Calcium Signaling Responses to Abiotic Stresses in <i>Physcomitrella patens</i>.

patens Similarly to the previous reports in rice [ 9 ], the [Ca 2+ ] i -dependent luminescence signal was related to the degree of salt stress ( Figure 5 A); 0.1 M NaCl induced a significantly stronger average luminescence signal than the control ( p < 0.05), and a highly significant difference was observed between the signals induced under the 0.1 M, 0.2 M, and 0.3 M NaCl treatments ( p < 0.001), indicating that low concentrations of NaCl induced a rapid increase in [Ca 2+ ] i -dependent luminescence signaling.

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