Phytochrome action inOryza sativa L. VI. Red far-red reversible effect on early development of coleoptiles |
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Authors: | Ranjana Paul Masaki Furuya |
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Institution: | (1) Department of Botany, Faculty of Science, University of Tokyo, Hongo, 113 Tokyo |
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Abstract: | When 3–4 mm long coleoptiles of etiolated rice seedlings (cv. Koshijiwase) were irradiated with continuous red light their
growth was seriously inhibited. If a brief exposure of red light (4×103 ergs cm−2) was given to the short coleoptiles, the growth rate dropped immediately after the irradiation, but the growth did not stop
till the coleoptile reached some calculated length. If another brief red irradaition of the same order was given 24 hr after
the first, the growth rate and the final length dropped further. The effect of red light was reversed by successively given
far-red light, and this response was repeatedly red and far-red reversible. The escape reaction was rather slow so that photoreversibility
was not lost at all by 8th hr, and 50% of the initial reversibility was lost within ca. 16 hr at 25±0.5 C. Blue light also
induced the inhibition of coleoptile elongation, the effect was reversed by subsequent far-red irradiation, and this could
be obtained repeatedly. Thus, the photoinhibition of the young coleoptile can be concluded to be under the control of phytochrome,
and the mode of action appeared quite different from the previously reported results with longer coleoptiles. |
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