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- Title
Evidence that P<sub>fr</sub> is not the active form of phytochrome in light-grown maize.
- Authors
Smith, Harry
- Abstract
The biological activity of the plant photochromic photoreceptor, phytochrome, is generally thought to reside in Pfr the far-red-absorbing form, whilst the red-absorbing Pr is inactive. This view is based solely on incomplete correlations between spectrophotometrically detectable Pfr and responses in etiolated tissues given brief light treatments1,2. Studies of light-grown seedlings have recently revealed an inverse, linear relationship between phytochrome-regulated extension growth and phytochrome photoequilibrium (defined as Pfr/(Pr+Pfr) and estimated from the spectral photon distribution of the actinic radiation)3-10. Such a relationship could only fit the 'Pfr as active form' theory if Pr+Pfr (that is, Ptotal) remained constant and independent of the light sources used. Here I report data from herbicide-bleached, light-grown maize seedlings which show that Ptotal is strongly dependent on the wavelength distribution of the radiation and that the amount of Pfr does not correlate with growth response.
- Publication
Nature, 1981, Vol 293, Issue 5828, p163
- ISSN
0028-0836
- Publication type
Article
- DOI
10.1038/293163a0