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The form of pigment which inhibits germination is
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$\mathrm{P}_{730}$
The seed germination is promoted by red wavelength (650 nm) and inhibited by far red $(730 \mathrm{~nm}$), this is due to the pigment phytochrome behaving in the following manner.
$\begin{aligned} & \text { Red } \lambda \longrightarrow \text { No germination } \\ & \end{aligned}$
$\begin{aligned} & \text { Red } \lambda \longrightarrow \text { No germination } \\ & \end{aligned}$
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