Phytochrome plays a critical role in seed germination. Red color maximizes the seed germination.
Red light promotes blooming and vegetative growth (but if a plant gets too much, it will become tall and spindly).
Growing foliage plants and short, stocky seedlings is good for blue light since it regulates plant growth (but too much will result in stunted plants).
Generally speaking, red-wavelength light encourages germination. Far-red (FR) light suppresses seed germination beneath the canopy by deactivating phytochrome photoreceptors.
This causes levels of gibberellins (GA) to drop and levels of abscisic acid (ABA) to rise.
Far red light has the best germination rate (100%), followed by black light (97.5%). The germination rate (95%) is the same under control and red light.
learn more about Phytochrome here: https://brainly.com/question/13048818
