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Light Quality During Night Interruption Affects Morphogenesis and Flowering in Geranium
박유경,정병룡,Sowbiya Muneer,Prabhakaran Soundararajan,Abinaya Manivnnan 한국원예학회 2017 Horticulture, Environment, and Biotechnology Vol.58 No.3
We investigated the effects of light quality during night interruption (NI) on morphogenesis, flowering, andthe transcription of photoreceptor genes in the geranium Pelargonium × hortorum L.H. Bailey ‘Ringo 2000 Violet’(day neutral plant, DNP). Plants were grown in an environment-controlled chamber under a constant light intensity of180 μmol·m-2·s-1PPF. The light was supplied by white (W) light emitting diodes (LEDs) to create long day (LD, 16h light/8 h dark), short day (SD, 10 h light/14 h dark), or SD with a 4 h night interruption (NI) conditions. The NIwas provided by green (NI-G), blue (NI-B), red (NI-R), far-red (NI-Fr), or white (NI-W) LEDs at a significantly reducedintensity of 10 μmol·m-2·s-1PPF (only 5.5% of the intensity of the main light source). Plant height was greatest underNI-Fr. The percent flowering was not affected by light quality during NI, and all plants flowered under all treatments. Among NI treatments, days to visible flower buds (DVB) increased under NI-Fr. All photoreceptor genes exceptphyB and FTL were highly expressed under normal LD conditions. Under the NI treatment with different qualities oflight, these photoreceptor genes were expressed at even higher levels, except under NI-B, as compared to SD. Theseresults suggest that morphogenesis, flowering, and the expression of transcription factor genes are affected by lightquality during NI. Light quality during NI in the DNP geranium has more pronounced effects on morphogenesis thanon flowering.
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Yoo Gyeong Park,Sowbiya Muneer,Prabhakaran Soundararajan,Abinaya Manivnnan,정병룡 한국원예학회 2016 Horticulture, Environment, and Biotechnology Vol.57 No.4
We investigated the effects of light quality during night interruption (NI) on morphogenesis, flowering, and the transcription of photoreceptor genes in Petunia hybrida Hort. ‘Easy Wave Pink’ (a qualitative long-dayplant, LDP). Plants were grown in a closed-type plant factory under a constant light intensity of 180 μmol·m-2·s-1 PPF provided by white (W) light emitting diodes (LEDs) under long day (LD, 16 h light/8 h dark), short day (SD,10 h light/14 h dark), or SD conditions with a 4 h NI using green (NI-G), blue (NI-B), red (NI-R), far-red (NI-Fr), or white (NI-W) LEDs at an intensity of 10 μmol·m-2·s-1 PPF. Shoot length was greatest under NI-Fr. Flowering was observed under LD, NI-G, NI-Fr, and NI-W. The expression of photoreceptor genes was induced by NI. Specifically, phyA, phyB, and cry1 were more highly expressed under NI-G, NI-B, and NI-R compared to LDand SD. These results suggest that morphogenesis, flowering, and transcriptional factors are strongly affected by light quality during NI.
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