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End-Of-Day Lighting with Different Red/Far-Red Ratios Using Light

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End-Of-Day Lighting with Different Red/Far-Red Ratios Using Light GROWTH REGULATORS HORTSCIENCE 42(7):1609–1611. 2007. solstices at lat. 56°N, it lasts for up to 54 and 44 min, respectively, whereas year-round twilight lasts for 20 min near the equator End-of-day Lighting with Different (List, 1971). Eliminating twilight using black-out curtains in experiments during Red/Far-red Ratios Using Light- early spring in Canada (lat. 42°N) resulted in a decrease of 10% to 25% in height of emitting Diodes Affects Plant Growth easter lilies compared with ambient (Blom et al., 1995; Blom and Kerec, 2003). A similar experiment in Norway (lat. 60°N) of Chrysanthemum · morifolium with chrysanthemum and tomato had no or only a small effect on plant height (Mortensen Ramat. ‘Coral Charm’ and Moe, 1992). The latter experiment was 1 done during summer with photoperiods Janni Bjerregaard Lund varying between 12 and 18.5 h. Knowledge Department of Agricultural Sciences, Copenhagen University, Hoejbak- from experiments with EOD-FR is useful in kegaardalle 21, DK- 2630 Taastrup, Denmark understanding the effect of twilight, and EOD-FR response has been suggested to be Theo J. Blom the most effective in increasing the stem Department of Plant Agriculture, University of Guelph, Guelph, Ontario, elongation rate during short photoperiods Canada N1G 2W1 (Downs et al., 1957; Vince-Prue, 1977). The effects of twilight on elongation are Jesper Mazanti Aaslyng not clear and might depend on factors like the AgroTech A/S, Taastrup, Denmark season and irradiance. Photoreceptors serve not only as quality detectors, but also as Additional index words. LED, plant growth retardants, stem elongation, twilight photon counters (Smith and Whitelam, Abstract. Controlling plant height without the use of plant growth retardants is one of the 1990). Therefore, we wanted to test whether goals in future production of potted plants. Light quality with a low red to far-red ratio small differences in irradiation for the same (R:FR) increases plant height. In this trial, the effects of light quality [R:FR ratio of 0.4, ratios of R:FR would affect plant growth and/ 0.7, and 2.4 (R = 600–700 nm, FR = 700–800 nm)] at the end of day were investigated on or development. potted chrysanthemums using growth chambers. After a 9-h photoperiod, the 30-min The objective of this study was to inves- end-of-day lighting was provided by light-emitting diodes at low irradiance by main- tigate whether EOD light quality as found –2 –1 –2 –1 during twilight affects growth and develop- taining either red = 1 mmolÁm Ás (Rcon) or far-red = 1 mmolÁm Ás (FRcon). After 3 weeks of end-of-day lighting, plants given the lowest end-of-day ratios (R:FR of 0.4 or 0.7) mental characteristics of potted chrysanthe- were taller than control plants (R:FR = 2.4). For low ratios of R:FR (0.4), the actual mums and whether elongation depends on intensities of R and FR did not affect plant height, whereas for higher ratios of R:FR (0.7 R:FR alone or on the level of irradiance of R and FR as well. For this purpose, it was and 2.4), plant height was greater for FRcon than for Rcon. Leaf area of the lateral side shoots was lower for plants treated with an R:FR of 0.4 compared with those of controls. decided to create artificial twilight using Dry weight, stem diameter, number of internodes, and number of lateral branches were light-emitting diodes (LEDs) in growth unaffected by the end-of-day ratio. chamber experiments. Light-emitting diodes give the possibilities of small and precise changes in intensity and spectral distribution of the EOD light treatment. One of the environmental concerns in the sible states, Pfr and Pr. Irradiation with high production of potted plants is the use of plant levels of far-red light increases the proportion Materials and Methods growth retardants (PGRs) for the control of of the molecule in the Pr state, whereas a high plant height. In the search for alternatives amount of red light increases the proportion Plant material. Rooted cuttings of to PGRs, changes in light quality [e.g., of the Pfr form. Light quality determines the Chrysanthemum morifolium Ramat. ‘Coral increased red to far-red ratio (R:FR ratio)] R:FR ratio and phytochrome photoequili- Charm’ were planted singly in 10-cm pots have been shown to limit elongation growth brium (j), which in turn determines plant filled with standard peat mix (Pindstrup 2; (Khattak and Pearson, 2006; Mortensen and morphology (Holmes and Smith, 1977). In Pindstrup, Denmark). In the growth cham- Strømme, 1987; Rajapakse and Kelly, 1992). Arabidopsis, phytochrome is represented by bers, six batches of plants were placed during However, the effect of changes in light five members: phytochrome A (phyA) to 2004 (5 July, 27 July, 24 Aug., 21 Sept., 16 quality is not always positive. A decrease in phytochrome E (phyE) (Quail, 2002; Smith, Nov., 14 Dec.). Each batch was kept for 21 the R:FR ratio at the end of the day occurs 2000). Phytochrome B is assumed to play a d in the growth chambers. From each batch, naturally during twilight. This has been role at all stages of the life cycle (Smith, 72 nonpinched plants were selected for uni- shown to increase stem elongation in differ- 2000), including the increase in stem elon- formity and distributed among three plots ent plant species (Blom et al., 1995; Blom gation in response to EOD-FR treatments arranged in two growth chambers (1.3 m · and Kerec, 2003) comparable to end-of-day (Smith, 2000; Smith and Whitelam, 1990). 2.5 m, PGV36; Conviron, Winnipeg, Man- far-red (EOD-FR) treatments. Under outside conditions, the R:FR ratio itoba, Canada) after being cultivated for 4 The photoreceptor, phytochrome, is changes from 1.15 during daylight to 0.7 weeks in a greenhouse (16-h daylength, 22 °C responsible for the physiological responses during twilight in the evening (Holmes and day/18 °C night) at Copenhagen University incited by changes in red (600–700 nm) and Smith, 1977). Outside measurements at lat. (Copenhagen, Denmark). The two growth far-red (700–800 nm) light. The phyto- 42°N (Feb.1) showed that the R:FR ratio was chambers were divided into four sections of chrome molecule exists in two photorever- 1.37 at official sunset with photosynthetic 0.8 m2 cultivation area (black plastic covered photon flux (PPF) of 3.8 mmolÁm–2Ás–1, with white plastic on either side from the top whereas R:FR decreased to 0.69 with PPF to the bottom of the chamber). Only three of –2 –1 Received for publication 5 Mar. 2007. Accepted 0.06 mmolÁm Ás (near darkness) over a the four sections were used. In each section, for publication 1 July 2007. period of 30 min (Blom et al., 1995). The 24 plants were randomly distributed, 12 1To whom reprint requests should be addressed; twilight period depends on the time of the border plants and 12 plants for measurements e-mail [email protected] year and latitude. Near summer and winter (30 plants/m2). HORTSCIENCE VOL. 42(7) DECEMBER 2007 1609 Growing conditions. One week before the ation of R and FR was adjusted. The LEDs’ start of the experiment, the plants were placed spectral distribution did not change in the in the growth chambers applying a 16-h range of the electrical current (0–2.3 A). photoperiod at 21 °Cday/18°C night. Irriga- Plant measurements. Nondestructive tion and fertilization were done simultaneously measurements were carried out on the plants (fertigation) using drippers. In the first week, at days 1, 7, 14, and 21 from start of the light plants were fertigated once a day (Pioneer treatments. Number of lateral branches and Macro 14N–3P–23K + Mg combined with internodes (greater than 1 cm) were counted Pioneer Micro; pH 5.5; electrical conductivity and height (from soil level to apical bud) was 1.3; Broste, Denmark). Later with increasing measured. Both nondestructive and destruc- plant size, fertigation was done twice daily. tive measurements were carried out for the Metal halide lamps (400 W HQI-T; Osram, final harvest (day 21) using all 12 plants. Leaf Mu¨nchen, Germany) and incandescent bulbs area (LI-3100 Area meter; LI-COR, Lincoln, (40 W Osram, Germany) were used as the NE) and dry weights (86 °C for 48 h) of Fig. 2. Effect of end-of-day treatments with red/far- mainlightsourceandswitchedonandoff leaves from the main stem, leaves from red (R:FR) ratios of 0.4, 0.7, or 2.4 on increase according to the needs of the different exper- lateral branches, stem of lateral branches, in plant height of Chrysanthemum morifolium imental treatments. The mean PPF at the top and the main stem were determined. At the ‘Coral Charm’ during 3 weeks of daily treat- of the plant canopy was 120 mmolÁm–2Ás–1 final harvest, stem diameter was measured at ments of 30 min each. SE is based on the means of three plantings (n = 36). Regressions lines (± 10) (measured under the LED racks) and 8 cm from the apical point using a caliper. that were not significantly different were the daily light integral delivered in the cham- Statistical analysis. Treatments were pooled (R and FR = 0.4), so data represent bers (3.9 mol m–2 d–1) represents a winter day rerandomized between replicates and com- con con Á Á means of 72 plants. FRcon 2.4: Y = –0.01 + 4.81 2 2 in northern Europe. The R:FR ratio of the partments.
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