Abstract
A selective but critical assessment of the published relations between spectrophotometric measurements of phytochrome parametersin vivoand physiological responses is presented. Although a number of correlations between response and the apparent concentration of Pfr(i.e. [Pfr]) have been reported, these are counterbalanced by authenticated cases of lack of correlation. The reported relations between [Pfr] and response are not uniform, nor are they subject to ready interpretation. It seems useful to consider the responses of dark-grown and light-grown plants to be in principle different, with partly de-etiolated plants exhibiting intermediate responses. Dark-grown plants show high sensitivity to small changes in [Pfr] at low [Pfr], whereas light-grown plants show high sensitivity at high [Pfr]. Current data are not easily interpretable in terms of Pfrbeing the only active component of the phytochrome system.
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Schedule a callMore From: Philosophical Transactions of the Royal Society of London. B, Biological Sciences
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