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Different Phototransduction Kinetics of Phytochrome A and Phytochrome B in Arabidopsis thaliana1

Jorge J. Casal*, Pablo D. Cerdán, Roberto J. Staneloni, and Laura Cattaneo

I.F.E.V.A., Departamento de Ecología, Facultad de Agronomía, Universidad de Buenos Aires, Avenida San Martín 4453, 1417-Buenos Aires, Argentina (J.J.C., L.C.); and Instituto de Investigaciones Bioquímicas Fundación Campomar, Avenida Patricias Argentinas 435, 1405-Buenos Aires, Argentina (P.D.C., R.J.S.)

The kinetics of phototransduction of phytochrome A (phyA) and phytochrome B (phyB) were compared in etiolated Arabidopsis thaliana seedlings. The responses of hypocotyl growth, cotyledon unfolding, and expression of a light-harvesting chlorophyll a/b-binding protein of the photosystem II gene promoter fused to the coding region of beta -glucuronidase (used as a reporter enzyme) were mediated by phyA under continuous far-red light (FR) and by phyB under continuous red light (R). The seedlings were exposed hourly either to n min of FR followed by 60 minus n min in darkness or to n min of R, 3 min of FR (to back-convert phyB to its inactive form), and 57 minus n min of darkness. For the three processes investigated here, the kinetics of phototransduction of phyB were faster than that of phyA. For instance, 15 min R h-1 (terminated with a FR pulse) were almost as effective as continuous R, whereas 15 min of FR h-1 caused less than 30% of the effect of continuous FR. This difference is interpreted in terms of divergence of signal transduction pathways downstream from phyA and phyB.

1   This work was supported by grants from the University of Buenos Aires (no. AG041 to J.J.C. and no. 01/X304 to R.J.S.), Fundación Antorchas (no. A-13434/1 to J.J.C.), and Consejo Nacional de Investigaciones Cientificas y Tecnicas (no. PIA 6524 to J.J.C. and no. PICT 0295 to R.J.S.).
*   Corresponding author; e-mail jjcasal{at}ifeva.edu.ar; fax 541-521-1384.

Plant Physiol. (1998) 116: 1533-1538
Copyright Clearance Center:   0032-0889/98/116/1533/06
© 1998 American Society of Plant Physiologists




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