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Phytochrome photoequilibria within a model green leaf have been calculated. The results show a gradient in photoequilibria within the leaf lamina due to selective attenuation of incident light by the leaf tissue. Large differences were observed between photoequilibria calculated for a leaf under natural daylight and photoequilibria calculated for a leaf receiving daylight filtered through a vegetation canopy.
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Holmes et al. (1979) studied this question.
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