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Asked by Mohammad Last Modified
A defoliated plant, which has had its leaves removed, would still respond to the photoperiodic cycle. This is because the ability to perceive changes in day length is not solely dependent on the presence of leaves, but rather on specialized light-sensitive structures within the plant called photoreceptors, primarily phytochromes.
Phytochromes are photoreceptor proteins that detect changes in the quality and duration of light, including variations in day length. They are primarily located in the meristematic tissues of the plant, such as the shoot apical meristem, where they play a key role in regulating flowering and other developmental processes in response to photoperiodic cues.
Even in the absence of leaves, phytochromes in the remaining stem tissue or other parts of the plant are still capable of perceiving changes in day length. This information is then transmitted to the plant's internal signaling pathways, triggering appropriate physiological responses such as flowering initiation, dormancy induction, or growth regulation.
Therefore, while the absence of leaves may affect certain aspects of the plant's response to the photoperiodic cycle, such as photosynthesis and hormone production, it would not entirely negate the plant's ability to detect and respond to changes in day length through the activity of photoreceptors like phytochromes.
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