LED REGULATE FLOWERING OF PHOTOPERIODIC ORNAMENTAL CROPS

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LED REGULATE FLOWERING OF PHOTOPERIODIC ORNAMENTAL CROPS ( led-regulate-flowering-photoperiodic-ornamental-crops )

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Technologies, Inc., Aurora, IL). The second to seventh fully expanded true leaves below the first inflorescence of a plant were selected for chlorophyll content measurement, and the average of the six measurements were recorded. Days to VB from transplant, days to flower from transplant (and for calibrachoa in the second replication, from when ethephon was applied), increase in leaf number, and flowering percentage were subsequently calculated. Data were analyzed with the SAS (Version 9.3; SAS Institute, Cary, NC) mixed-model (PROC MIXED) and glimmix-model (PROC GLIMMX) procedures, and pairwise comparisons between treatments were performed using Tukey’s honest significant difference test (P = 0.05). Data were pooled from two replications when there was no interaction between main effects and replication, or response trends were similar between replications. Results Calibrachoa ‘Callie Yellow Improved’ In our study, lighting treatments indicate treatments using NI and/or DE lighting. All plants flowered under all lighting treatments within 30 d after transplant, whereas plants under the SD did not flower within 60 d after transplant (data not shown). Thus, no data were collected for plants under the SD. Compared with that under the B0* NI, flowering under the B1* NI and B15* NI was similar, but flowering under the B30* NI was accelerated by 4 d (Figure IV-2). The B30 NI promoted flowering similarly to the other NI lighting treatments. Plants flowered 4 d earlier under the B0* NI than the B0* DE. Flowering was similar under the B0* DE and B0* DE+B30 NI. Plants under the B30* NI formed VB 4 d earlier than those under the B0* DE (Table IV-3). The main stem of plants under the B0* DE+B30 NI was 28 to 39% longer than that under the B30* and B30 NI. Visible bud number was similar under all lighting treatments. 101

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