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PHOTOMORPHOGENESIS IN PENICILLIUM ISARIIFORME III. THE ACTION SPECTRUM FOR PHOTOTROPIC CURVATURE OF THE COREMIA
Author(s) -
Bennink G. J. H.,
Triep F.
Publication year - 1973
Publication title -
acta botanica neerlandica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.871
H-Index - 87
eISSN - 1438-8677
pISSN - 0044-5983
DOI - 10.1111/j.1438-8677.1973.tb00902.x
Subject(s) - action spectrum , spectral line , phototropism , action (physics) , curvature , spectrum (functional analysis) , physics , wavelength , mathematics , optics , biology , botany , quantum mechanics , geometry , blue light
SUMMARY The action spectrum for the phototropical curvature of the coremia of P. isariiforme was determined by means of unilateral illumination. The I 50 (Λ) , that is the light intensity at wavelength Λ at which 50% of the coremia react positively, was calculated from a series of experiments with the help of the probit analysis. The I 50 (Λ) , the 95% confidence interval, and the relative quantum efficiency were calculated and a plot of the values gave the action spectrum. This spectrum is quite different from the action spectra for sporulation and initiation of coremia in the same fungus. However, with peaks at 425 nm, 450 nm and 476 nm, it resembles rather well the action spectra for other light‐sensitive fungi. Therefore it might be assumed that in P. isariiforme the same photoreceptor as in other fungi is active. The great difference between the three action spectra remains to be explained. Possibly a screening pigment causes the distortion of the action spectra.