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- #Plant Physiology
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Red and far-red lights are perceived by plants through various photoreceptors including phytochromes. The activation of phytochrome is caused by
conversion of Pr to Pfr form through the effect of red light.
repression of Pr form through the effect of far-red light.
equal proportion of red and far-red lights at same fluence rates.
presence of red and far-red light at different fluence rates.
Answers (1)
The activation of phytochromes is caused by the conversion of the inactive form, called Pr (phytochrome red-absorbing form), to the active form, called Pfr (phytochrome far-red-absorbing form). This conversion is triggered by the absorption of red light.
When phytochrome molecules absorb red light, they undergo a structural change that converts them from the Pr form to the Pfr form. This conversion leads to the activation of phytochromes and initiates various physiological responses in plants.
The Pfr form of phytochrome is biologically active and can elicit specific signaling pathways within the plant. These pathways control various processes such as seed germination, stem elongation, flowering, and the transition from vegetative growth to reproductive development.
Conversely, when phytochromes absorb far-red light, they undergo a reverse conversion, changing from the Pfr form back to the Pr form. This conversion in response to far-red light deactivates phytochromes and can also trigger different physiological responses in plants.
Therefore, the conversion of Pr to Pfr form through the effect of red light is indeed responsible for the activation of phytochromes, enabling plants to perceive and respond to red and far-red light signals in their environment
Hence, the correct answer is option 1.
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