AI Article Synopsis
- The phototropic response of the JK224 strain of Arabidopsis thaliana varies depending on the fluence rate and light wavelength used.
- At a low fluence rate of 0.1 micromole m-2 s-1 with 450-nm light, there's one peak response, while at a higher rate of 0.4 micromole m-2 s-1, two peaks emerge.
- Preirradiating the plants with high fluence 510-nm light modifies the response to subsequent 450-nm light, suggesting that a specific photoreceptor pigment in this strain has been affected.
Article Abstract
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.
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