IF a plant of Oenothera lamarckiana Ser. is placed in a dark room 1 h before the flowers would have opened outdoors, all the flower buds open within 1 h because they have reached the physiological stage of development which permits them to bloom on the same evening. On the other hand, if the plant is exposed to continuous illumination with white light of sufficient energy there is no flowering as long as the plant is exposed to the light. These phenomena show that light retards the opening of the fully developed flower bud of this plant, and that the opening of the flower of O. lamarckiana has a response to light and dark which is different from the response shown by O. berteriana and several other species of Oenothera1–3. In addition, it was shown that the light sensitive region is located in the flower bud.
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SAITO, M., YAMAKI, T. Retardation of Flower Opening in Oenothera lamarckiana caused by Blue and Green Light. Nature 214, 1027 (1967). https://doi.org/10.1038/2141027a0