Temperature sensing by plants: the primary characteristics of signal perception and calcium response.

摘要: Summary Cold elicits an immediate rise in the cytosolic free calcium concentration ([Ca2+ ]c) of plant cells. We have studied concerted action three underlying mechanisms, namely sensing, sensitisation and desensitisation, which become important when plants field are subjected to changes temperature. applied different regimes temperature with well-defined cooling rates intact roots Arabidopsis thaliana expressing calcium-indicator, aequorin. Our results indicate that sensing is mainly dependent on rate, dT/dt, whereas absolute T less importance. were found be sensitive than dT/dt = 0.01LC/s. However, at below 0.003LC/s (i.e. 10LC 1 h) there no detectable [Ca 2+ ] c response all. At low temperature, sensitivity cold-detection system increased. This turn produces greater cooling-induced [Ca2+ ]c elevations. Prolonged or repeated cold treatment attenuates responses subsequent episodes