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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emitting R and FR light (i.e., the INC, B+R+FR, and R+FR NI) than the treatments emitting R but not FR (i.e., the W and B+R NI). All marigold plants flowered under all treatments (data not shown). Plants flowered similarly under the B NI and SD. Compared with plants grown under the B NI and SD, the B+FR NI delayed flowering by 4 d while all the other NI lighting treatments, which all emitted R light, delayed flowering by 11 d. At flowering, plants were approximately 4 cm taller under the INC, W, B+R+FR, and R+FR NI than under the B NI and SD. There were more VBs under the B NI compared with the INC, W, B+R+FR, and R+FR NI. The increase in leaf number was 9 under the B NI and SD, 11 under the B+FR NI, and 13 under all the other NI lighting treatments, which all emitted R light. Long-day plants All dianthus plants flowered (data not shown), but compared with plants grown under the SD, the R+FR and B+R+FR NI accelerated flowering by 5 or 6 d, while flowering time was similar to the SD under all the other NI lighting treatments (Figure III-2). At flowering, plants were approximately 4 cm taller under the INC, W, B+FR, B+R+FR, and R+FR than under the SD (Table III-4). Plants grown under the B+R+FR and R+FR NI were approximately 4 cm taller than those grown under the B and B+R NI. Plants grown under the B+R NI and SD formed approximately four more VBs than those grown under the R+FR NI. Petunia WPC plants did not flower under the B NI or SD, whereas all plants flowered under all the other NI lighting treatments except the B+R NI in the first replication (30% flowering) and the B+FR NI in the second replication (60% flowering). Plants flowered similarly under NI lighting treatments emitting both R and FR light (i.e., the INC, B+R+FR, and R+FR NI). Compared with plants grown under the INC NI, the W, B+R, and B+FR NI delayed 70

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