phytochrome


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Related to phytochrome: Cryptochrome

phy·to·chrome

 (fī′tə-krōm′)
n.
Any of several photoreceptive pigments in green plants that regulate processes such as flowering and seed germination.

phytochrome

(ˈfaɪtəʊˌkrəʊm)
n
(Botany) botany a blue-green pigment existing in two interchangeable forms, present in most plants, that mediates many light-dependent processes, including photoperiodism and the greening of leaves

phy•to•chrome

(ˈfaɪ təˌkroʊm)

n.
a plant pigment that is associated with the absorption of light in the photoperiodic response and that may regulate various types of growth and development.
[1890–95]
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2010), and this effect is more pronounced in chilled seeds (moist stratification at 4[degrees]C) compared to non-chilled seeds, suggesting an interaction of low temperatures with phytochrome in dormancy alleviation (Taylorson & Hendricks, 1969; Gallagher & Cardina, 1997, 1998a, b; Leon & Owen, 2003).
Such impacts are related to phytochrome which is a photoreceptor able to sense the radiations at different wave lengths.
This insensitivity to light may be due to the quantity of phytochrome present in the seeds in the active form being insufficient to induce the germination process (Bewley et al.
Furthermore, genetic and molecular studies have advocated that DOF proteins are implicated in the regulation of biological processes exclusive to plants, for instance, light-responsiveness, photoperiodic flowering, tissue differentiation, dormancy, seed germination and maturation, metabolic regulation and nitrogen assimilation and phytochrome and phytohormone signalling (Gupta et al.
Previous studies have confirmed that the seeds depend on phytochrome, perceiving the surrounding environment and respond through the optical signal pathway (Dooley et al.
ALA is a precursor in the biosynthesis of phytochromobilin, which is a phytochrome chromophore, ALA may have an effect on the content of phytochromobilin, such that a phytochrome pathway might mediate anthocyanin accumulation in fruit treated with ALA during the initial storage.
Phylogeny of the parasitic family Orobanchaceae inferred from phytochrome A.
Control of mitosis by phytochrome and a blue-light receptor in fern spores.
However, higher germination for dark incubated seeds could indicate the biosynthesis of gibberellins (mediated through the phytochrome system) may have been inhibited by light exposure (Kato-Noguchi, 2002).