Analysis of multiple photoreceptor pigments for phototropism in a mutant of Arabidopsis thaliana
1992
Konjevic, R. | Khurana, J.P. | Poff, K.L.
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 micromol m-2s-1), the response to 450-nm light is characterized by a single maximum at about 9 micromol m-2. At higher fluence rate (0.4 micromol m-2s-1), the response shows two maxima, at 4.5 and 9 micromol m-1. The response to 510-nm light shows a single maximum at 4.5 micromol m-2. Unilateral preirradiation with high fluence rate (25 micromol m-2s-1) 510-nm light eliminates the maximum at 4.5 micromol m-2 in the fluence response curve to a subsequent unilateral 450-nm irradiation, while the second maximum at 9 micromol 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.
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