A comparative study of the responsivity of Sinapis alba L. seedlings to pulsed and continuous irradiation |
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Authors: | E Schäfer C J Beggs L Fukshansky M G Holmes M Jabben |
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Institution: | (1) Institut für Biologie II, Universität Freiburg, Schänzlestr.1, D-7800 Freiburg/Br., Federal Republic of Germany |
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Abstract: | Anthocyanin formation in 36h dark grown Sinapis alba L. seedlings and inhibition of hypocotyl elongation in 36h and 54h dark grown and 54h and 7 day light grown seedlings in response to continuous red light could be substituted for by hourly 5 min light pulses where the total fluence over the irradiation period is the same. These pulses are partially (36h) or almost totally (54h and 7 day) reversible by subsequent far-red (RG 9) light pulses. In contrast to 654 nm light, hourly light pulses with 552 nm, 449 nm and 715 nm can at best only partially substitute for continuous irradiation. These data are discussed with respect to the commonly used models for the phytochrome high irradiance response.Abbreviations Ptr
tar-red absorbing form of phytochrome
- SAN 9789
4-chloro-5-(methyl-amino)-2-(,,-trifluoro-m-tolyl)-3(2H)-pyridazinone=Norflurazon
- HIR
High irradiance response |
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Keywords: | Anthocyanin formation High-irradiance response Phytochrome cycling and induction Sinapis |
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