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Plant Physiology 77:731-734 (1985)
© 1985 American Society of Plant Biologists

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Articles

Analysis of the Effect of Light and Temperature on the Fluence Response Curves for Germination of Rumex obtusifolius

Massanori Takaki1, Gerda H. Heeringa, John W. Cone2 and Richard E. Kendrick

Plant Physiology Research, Agricultural University, Generaal Foulkesweg 72, 6703 BW Wageningen, The Netherlands

Both red light (10 minutes) and 35°C treatment (60 minutes) stimulate the germination of seeds of Rumex obtusifolius otherwise maintained in darkness at 25°C. Fluence response curves were determined for the effect of red light to stimulate germination of seeds with and without 35°C treatment. The endogenous far-red absorbing form (Pfr) level in the seeds was determined using short saturating fluences of wavelengths of light which maintain different proportions of phytochrome as Pfr at equilibrium. In the seed batches investigated, the endogenous Pfr level was found to be 4% or less of the total phytochrome. High dark germination after 35°C treatment does not result from an increase in sensitivity of the whole population to Pfr. Calculated fluence response curves for germination which best fit the experimental data suggest that seeds germinate in darkness after 35°C treatment because of a nonphytochrome-related process (overriding factor).

1 Supported by Conselho Nacional de Desenvolvimento Cientifico e Technoloaico (CN pq, 401127/83)-Brasil. Present address: Departmento de Botânica, Instituto de Biosciências, Universidade Estadual Pauliste "Julio de Mesquita Filho", Campus de Rio Claro, CEP 13.500, Rio Claro, Sao Paulo, Brasil.

2 Supported by Foundation for Fundamental Biological Research (BION), which is subsidized by The Netherlands Organization for the Advancement of Pure Research (ZWO).






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Copyright © 1985 by the American Society of Plant Biologists