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2016 Vol.34, Issue 1 Preview Page
Growth and Flowering Responses of Petunia to Various Artificial Light Sources with Different Light Qualities
In Sook Park1
,
Kyung Jin Cho1,2
,
Jiseon Kim1,2
,
Ji Yoon Cho1
,
Tae Jo Lim1
,
Wook Oh12*
1Department of Horticultural Science, Yeungnam University
2LED-IT Fusion Technology Research Center, Yeungnam University
*교신저자. *Corresponding Author. 
28 February 2016. pp. 55-66
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Abstract

This study was carried out to investigate the effect of artificial light sources with different light qualities on the growth and flowering characteristics of a herbaceous long-day plant, Petunia × hybrida Hort. Seedlings of petunia cultivar ‘Madness Rose’ were potted, acclimated for one week, and grown in a phytotron equipped with tube- and bulb-type fluorescent lamps (FL tube and bulb), tube-type white light-emitting diodes (LED tube), halogen lamps (HL), metal halide lamps (MH), and high pressure sodium lamps (HPS) for 10 weeks. The temperature, photoperiod, and photosynthetic photon flux density (PPFD) in the phytotron were 22 ± 2 ˳ C, 16 h, and 25 ± 2 μmolㆍm-2ㆍs-1, respectively. Light sources combined with HL promoted stem elongation, and plant height and internode length decreased with increasing red to far-red (R:FR) ratio. FL tube + LED tube, HPS, and FL tube promoted branching, whereas plants grown under light sources combined with HL did not have any branches. Days to flowering (from longest to shortest) occurred as follows: FL tube + HL > FL tube + HL > MH > HPS = FL tube + FL bulb > FL tube + LED tube > LED tube > FL tube, indicating that reducing the R:FR ratio of the light sources promoted flowering. Only 20% of plants grown under an FL tube flowered, whereas under all other treatments, 100% of plants flowered. At 10 weeks after treatment, plants grown under HPS and MH had (cumulatively) 12 open flowers, and those grown under FL tube + FL bulb, LED tube, FL tube + LED tube, and HPS treatment had approximately seven flower buds. These results suggest that light sources with low R:FR ratios promote flowering and stem elongation in petunia, but they reduce its ornamental value due to overgrowth and poor branching.

Keywords
branching
days to flowering
long-day plant
Petunia × hybrida
red to far-red ratio
shade avoidance syndrome
stem elongation

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Information
  • Publisher :KOREAN SOCIETY FOR HORTICULTURAL SCIENCE
  • Publisher(Ko) :한국원예학회
  • Journal Title :Horticultural Science and Technology
  • Journal Title(Ko) :원예과학기술지
  • Volume : 34
  • No :1
  • Pages :55-66
  • Received Date : 2015-10-14
  • Revised Date : 2015-11-16
  • Accepted Date : 2016-01-25
  • DOI :https://doi.org/10.12972/kjhst.20160016
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