Spectral quality influence of light during development of Arabidopsis thaliana plants in regulating seed germination

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Abstract
During development of Arabidopsis thaliana plants, the spectral quality of light can influence the phytochrome controlled germination of the progeny. Plants grown under light rich in far red energies produce light requiring seed that contain phytochrome in the red absorbing or inactive form. Plants grown under light deficient in far red energies produce dark germinating seed that contain phytochrome converted mainly to the far red absorbing or active form. These responses are determined locally within the developing seed without influence from the vegetative portion of the plant. The developing seed is sensitive to spectral changes throughout embryogenesis until the seed begins to dehydrate just before full maturation. At that point the phytochrome is stabilized in the form photoinduced before dehydration. In relation to the induction of phytochrome controlled germination responses, the developing seed appears to act independently of the parent plant.

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