Question
Discuss about discovery of phytochromes.
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Answer
- Phytochromes are proteinaceous pigments present in cell membrane of green cells.
- Phytochromes receive photoperiodic stimulus and induce flowering in plants in response to light duration.
- Hendrick and Borthwick observed that in SD plants flowering is inhibited if dark period is interrupted by flash of red light (660 nm).
- If flash of far red light (730 nm) is given then again flowering is observed in SD plants.
- Pigment system of plant receives photoperiodic stimulus and these pigments exist in two interconvertible forms Pfr and Pr
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