Regulation of the leaf flatness by phytochrome and phototropin in <I>Arabidopsis thaliana</I>

Kozuka Toshiaki, Nagatani Akira

doi:10.14841/jspp.2010.0.0343.0

Light is the most important environmental factor that controls the leaf shape and structure. The leaf blade has a wide and flat lamina structure to absorb light efficiently. Leaf flattening is enhanced in response to blue light, whereas the downward curing of leaves is observed under red light. Phototropin mediate the above leaf flattening response to blue light. By contrast, little is known about the involvement of phytochrome in the regulation of leaf flatness.<br>In this study, we described the activity of PHYB to suppress the leaf flattening. We found that the flatness of the rosette leaves was enhanced by end-of-day far-red light treatment or phyB deficient mutation. To examine the interaction of PHYB with Phototropin, we made the phyBphot1phot2 triple mutant. The leaf blade of the triple mutant was as flat as that of the phyB leaf, although intense downward curling leaves were observed in the phot1phot2 leaf. Hence, PHYB appears to act downstream of PHOT1/PHOT2 in the leaf-flatness regulation. On the basis of these results, we suggest that antagonistic interaction between PHYB and PHOT1/PHOT2 is involved in the regulation of leaf flatness.

Regulation of the leaf flatness by phytochrome and phototropin in <I>Arabidopsis thaliana</I>

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