تخلق ضوئي
In developmental biology, photomorphogenesis is light-mediated development, where plant growth patterns respond to the light spectrum. This is a completely separate process from photosynthesis where light is used as a source of energy. Phytochromes, cryptochromes, and phototropins are photochromic sensory receptors that restrict the photomorphogenic effect of light to the UV-A, UV-B, blue, and red portions of the electromagnetic spectrum.[1]
The photomorphogenesis of plants is often studied by using tightly frequency-controlled light sources to grow the plants. There are at least three stages of plant development where photomorphogenesis occurs: seed germination, seedling development, and the switch from the vegetative to the flowering stage (photoperiodism).[2]
Most research on photomorphogenesis is derived from plants studies involving several kingdoms: Fungi, Monera, Protista, and Plantae.[3]
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History
Developmental stages affected
Seed germination
Seedling development
Photoperiodism
Light receptors for photomorphogenesis
Red/far-red light
Blue light
UV light
المصادر
- ^ خطأ استشهاد: وسم
<ref>غير صحيح؛ لا نص تم توفيره للمراجع المسماة:0 - ^ Hans Mohr (6 December 2012). Lectures on Photomorphogenesis. Springer Science & Business Media. pp. 4, 178, 183–184. ISBN 978-3-642-65418-3.
- ^ "Photomorphogenesis". photobiology.info. Retrieved 2018-12-07.