# S3 method for source_spct
Pfr_Ptot(x, ..., na.rm = FALSE)
Value
If x is numeric, giving wavelengths (nm), a vector of
numeric values giving the \(P_{fr} / P_{tot}\) at each wavelength or a
generic_spct object with the wavelength values sorted in ascending
order and the corresponding \(P_{fr} / P_{tot}\) values in column
s.q.response.
If x is a source_spct object, a single numeric value
giving the \(P_{fr} / P_{tot}\).
Arguments
x
an R object
...
not used
spct.out
logical Flag indicating if the returned object should be of
class response_spct instead of numeric.
na.rm
logical. If TRUElink[stats]{na.omit} is
first called on x.
Methods (by class)
Pfr_Ptot(default): Default for generic function
Pfr_Ptot(numeric): Specialization for numeric
Pfr_Ptot(source_spct): Specialization for source_spct
Calculate phytochrome photoequilibrium from spectral (photon) irradiance
Details
The calculations are based on data describing the photochemical
constants for the plant photoreceptor phytochrome measured in vitro
and available for wavelengths in the range 380 nm to 770 nm as published by
Mancinelli (1994). For reliable estimates of \(P_{fr} / P_{tot}\) from
spectral irradiance, the spectrum should cover all these wavelengths with
reasonably high wavelength resolution.
References
Mancinelli, A.L. (1994) The physiology of phytochrome action. In
Photomorphogenesis in plants, 2nd edition. R.E. Kendrick and G.H.M.
Kronenberg, eds. Kluwer Academic Publishers, Dordrecht, pp. 211-269. ISBN
978-0-7923-2551-2 (print), 978-94-011-1884-2 (on-line).
tools:::Rd_expr_doi("10.1007/978-94-011-1884-2_10")
See Also
Other phytochrome-related functions and data:
PHYs.mspct,
Pfr_Ptot_R_FR(),
Phy_Sigma(),
Phy_Sigma_FR(),
Phy_Sigma_R(),
Phy_reaction_rates()