Circadian-rhythms and the Induction of Flowering in the Long-day Grass Lolium-temulentum L
(1994) Plant, Cell and Environment — Vol. 17, n° 6, p. 755-761 (1994)
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- Plants of Lolium temulentum L. strain Ceres were grown in 8-h short day (SD) for 45 d before being exposed either to a single long day (LD) or to a single 8-h SD given during an extended dark period. For LD induction, the critical photoperiod was between 12 and 14 h, and more than 16 h were needed for a maximal flowering response. During exposure to a single 24-h LD, the translocation of the floral stimulus began between the fourteenth and the sixteenth hours after the start of the light period, and was completed by the twenty-fourth hour. Full flowering was also induced by one 8-h SD beginning 4 or 28 h after the start of a 40-h dark period, i.e. by shifting 12 h forward or beyond the usual SD. The effectiveness of a so-called 'displaced short day' (DSD) was not affected by light quality and light intensity. With a mixture of incandescent and fluorescent lights at a total photosynthetic photon flux density of 400 mu mol m(-2) s(-1), a 4-h light exposure beginning 4 h after the start of a 40-h dark period was sufficient to induce 100% flowering. The flower-inducing effect of a single 8-h DSD was also assessed during a 64-h dark period. Results revealed two maxima at a 20-h interval. This fluctuation in light sensitivity suggests that a circadian rhythm is involved in the control of flowering of L. temulentum.
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Perilleux, C., Bernier, G., & Kinet, JM. (1994). Circadian-rhythms and the Induction of Flowering in the Long-day Grass Lolium-temulentum L. Plant, Cell and Environment, 17(6), 755-761. https://doi.org/10.1111/j.1365-3040.1994.tb00168.x (Original work published 1994)