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florigen

)its a hormone responsible for inducing flowering in plants directly

)moves from leaves to the apex inducing flowering by phloem mechanism

)no inter conversion from one phase to other

phytochrome

)it is a light absorbing pigment which induces flowering in long day plants

)pigments p660 and p730 absorb red and far red light respectively

)p660absorbs red light and immediately converts into p730 and as p730 absorbs far red light which induces flowering thus flowering is induced in long day plants because p730 is present in day

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What is the pigment responsible for photoperiodism?

Action spectra and photoreversibility experiments show that phytochrome is the pigment that receives the red light. Red light is the most effective color in interrupting the night-time portion of the photoperiod.


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Phytochromes are a type of photoreceptor that is responsive to light in the red to far red range. They are used by plant seeds to determine when to germinate and by plants to set circadian rhythms and tell the season. A phytochrome is a set of 2 of the same protein that are stuck together, with kinase regions at the bottom and photoreceptor regions at the top. They have 2 configurations - one, called Pr, which is receptive to red light, and another, called Pfr, which is receptive to far red light. When a phytochrome receives it's type of light, it switches to the other configuration. In plants, phytochromes are made in the Pr configuration and are active in the Pfr configuration. -L.J.


Are all wavelengths of light equal in phototropism?

 No. Different forms of phytochrome absorb different wavelengths of light. Different forms of phytochrome are scattered throughout the plant. This allows the plant to perceive different intensities, wavelengths, and quality of light. Hope that helped!


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Related Questions

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