Analysis of multiple photoreceptor pigments for phototropism in a mutant of Arabidopsis thaliana.
The shape of the fluence-response relationship for the phototropic response of the JK224 strain of Arabidopsis thaliana depends on the fluence rate and wavelength of the actinic light.  At low fluence rate (0.1 micromole m-2 s-1), the response to 450-nm light is characterized by a single maximum at about 9 micromoles m-2.  At higher fluence rate (0.4 micromole m-2 s-1), the response shows two maxima, at 4.5 and 9 micromoles m-2.  The response to 510-nm light shows a single maximum at 4.5 micromoles m-2.  Unilateral preirradiation with high fluence rate (25 micromoles m-2 s-1) 510-nm light eliminates the maximum at 4.5 micromoles m-2 in the fluence response curve to a subsequent unilateral 450-nm irradiation, while the second maximum at 9 micromoles m-2 is unaffected.  Based on these results, it is concluded that a single photoreceptor pigment has been altered in the JK224 strain of Arabidopsis thaliana.
Konjevic
R
R
Michigan State University-Department of Energy, Plant Research Laboratory, East Lansing 48824-1312.
Khurana
J P
JP
Poff
K L
KL
D017360:Arabidopsis / Q000235:genetics* / Q000502:physiology / Q000528:radiation effects*; D008027:Light; D009154:Mutation; D010786:Photoreceptor Cells / Q000528:radiation effects*; D018524:Phototropism / Q000235:genetics / Q000528:radiation effects; D010860:Pigments, Biological / Q000528:radiation effects*; D014466:Ultraviolet Rays
D010860:Pigments, Biological