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Inhibitory Action of Blue and Far‐Red Light in the Flowering of Lemna paucicostata
Author(s) -
OHTANI TAKESHI,
ISHIGURI YOSHIO
Publication year - 1979
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.1979.tb06523.x
Subject(s) - photoperiodism , phytochrome , lemna , red light , blue light , botany , far red , biology , white light , horticulture , optics , physics
In a new strain of short‐day duckweed ( Lemna paucicostata T‐101), blue and far‐red light‐induced inhibition of flowering was investigated. Flowering of this strain failed to be induced under a short‐day photoperiod of blue and far‐red light, although it responded as a typical short‐day plant in red and white light. When the short‐day photoperiod of blue or far‐red light was terminated by a 15 min red light pulse, flowering recovered completely. This inducing effect of red light was reversed by subsequent exposure to far‐red light. Furthermore, it could be demonstrated that 30 min of blue light completely reversed the flowering inductive effect of 5 min red light and vice versa . Evidence is presented suggesting that the inhibitory action of blue and far red light may be due to the lowering of phytochrome P fr levels below those required to start the dark reactions which lead to flowering. These results are discussed in relation to the time measurement system of photoperiodism.