Plant Physiol. Journal of Pharmacology and Experimental Therapeutics
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Plant Physiology 94:370-374 (1990)
© 1990 American Society of Plant Biologists

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Metabolism and Enzymology

Phytochrome Effects on the Relationship between Chlorophyll and Steady-State Levels of Thylakoid Polypeptides in Light-Grown Tobacco 1

Jorge J. Casal2, Garry C. Whitelam and Harry Smith

Department of Botany, University of Leicester, Leicester LE1 7RH, United Kingdom

The effects of phytochrome status on chlorophyll content and on steady-state levels of thylakoid proteins were investigated in green leaves of Nicotiana tabacum L. plants grown under white light. Far-red light given either as a pulse at the end of each photoperiod, or as a supplement to white light during the photoperiod, reduced chlorophyll content per unit area and per unit dry weight. These differences were also observed after resolving chlorophyll-containing polypeptides by gel electrophoresis. Chlorophyll a:b ratio was unchanged. Both Coomassie blue-stained gels and immunochemical analyses showed that, in contrast to the observations in etiolated barley (K Apel, K Kloppstech [1980] Planta 150: 426-430) and pea (J Bennett [1981] Eur J Biochem 118: 61-70) seedlings, and in etiolated tobacco leaves (this report), in fully deetiolated tobacco plants changes in chlorophyll content were not correlated with obvious changes in the steady-state levels of thylakoid proteins (e.g. light-harvesting, chlorophyll a/b-binding proteins).

2 Permanent address: Departamento de Ecología, Facultad de Agronomía, Universidad de Buenos Aires, Av. San Martín 4453, 1417-Buenos Aires, Argentina.

1 J. J. C. was supported by Consejo Nacional de Investigaciones Científicas y Técnicas (República Argentina) and the ORS award scheme (U.K.).






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