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By van Jaarsfeld E.J., de Villiers P.U.

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This mutation caused defective photoreception and defective circadian phase setting in light–dark cycles (although it did not prevent normal entrainment by temperature cycles; Salome et al. 2002). A physiological hint in support of the latter notion is the low-fluence irradiance, in the range of 1 to 1,000 fmol m−2 s−1 of light, characterized by red/far-red reversibility (Wang 2005), effective in stimulating the known phytochrome responses of pulvinar cells (as, for example, in Moysset and Simon 1989; Kim et al.

Plumbaginifolia and in Arabidopsis seedlings; Fig. 6, and Johnson et al. 1995; see also the review by Hetherington and Brownlee 2004; Love et al. 2004), most likely in synchrony with the growth movements of the cotyledons. Circadian oscillations in free Ca2+ were not detected in nuclei (Wood et al. 2001), and thus it is not clear how the cytosolic oscillations communicate – as an input to and/or as an output from the clock, the core elements of which (LHY, CCA1 and TOC1) reside only in the nucleus (Dodd et al.

The receptor for temperature entrainment in plants is still an enigma – could it be an ion channel, or class of ion channels, similar to the heat- or cold-sensing TRP channels in mammals (Voets et al. 2004)? 4 Unanswered Questions The light-signalling transduction steps converging on the “osmotic motor” have been outlined schematically in Fig. 8. To date, the information is scarce. In fact, most of the questions below have not yet been answered, or adequately answered, in any plant system. The “osmotic motor” framework is not very mysterious but its functions still seek transporters: most of the transporters in the plasma membrane and in the tonoplast are yet to be defined and characterized physiologically, and identified molecularly.

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