Interaction of light and temperature on seed germination of Rumex obtusifolius L. |
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Authors: | David J Hand Gillian Craig Massanori Takaki Richard E Kendrick |
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Institution: | (1) Plant Biology Department, The University, NE1 7RU Newcastle upon Tyne, UK;(2) Present address: Departmento de Bioquimica, Universidade Federal de Pernambuco, 50.000 Recife, PE, Brasil;(3) Present address: Vakgroep Plantenfysiologisch Onderzoek, Generaal Foulkesweg 72, NL-6703 BW Wageningen, The Netherlands |
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Abstract: | Germination of Rumex obtusifolius L. seeds (nutlets) is low in darkness at 25° C. Germination is stimulated by exposure to 10 min red light (R) and also by a 10-min elevation of temperature to 35° C. A 10-min exposure to far-red light (FR) can reverse the effect of both R (indicating phytochrome control) and 35° C treatment. Fluence-response curves for this reversal of the effect of R and 35° C treatments are quantitatively identical. Treatment for 10 min with light of wavelenght 680, 700, 710 and 730 nm, after R and 35° C treatment, demonstrates that germination induced by 35° C treatment results from increased sensitivity to a pre-existing, active, far-red-absorbing form of phytochrome (Pfr) in the seeds.Abbreviations FR
far-red light
- P
phytochrome
- Pr
red-absorbing form of P
- Pfr
far-red-absorbing form of P
- R
red light |
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Keywords: | Germination (seeds) Light and germination Phytochrome Rumex Temperature and germination |
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