Abstract
This study was conducted to compare the growth and flowering characters of a dwarf purple loosestrife and purple loosestrife (Lythrum salicaria L.), and to determine the optimal photoperiod of dwarf purple loosestrife for forcing cultivation. Dwarf purple loosestrife was grown under natural sunlight (from 08:30 to18:30 HR, 10 h) and additional artificial lighting [0, 2, 3, 4, 6, or 14 h of continual light, or night interruption of 4 h (NI)] in a greenhouse. Growth and development of dwarf purple loosestrife were promoted by 14, 16, or 24 h or NI. The number of lateral shoots and plant height were higher as daylength was extended. However, the number of nodes was not influenced by photoperiod. The number of inflorescences was 0.6, 2.9, 5.0, or 4.2 under 14, 16, or 24 h, or NI, respectively. Also, plants under NI showed more uniform flowering (86%) than those under 14 h (48%). However, plants under 10, 12, or 13 h never produced inflorescences and remained as rosettes throughout the experiment. Therefore, we concluded that dwarf purple loosestrife has a critical photoperiod, 14-h daylength and NI is the effective method to accelerate growth and flowering for forcing cultivation.
Similar content being viewed by others
Literature Cited
Erwin, J.E., R.D. Heins, and R. Moe. 1991. Temperature and photoperiod effects on Fuchsia × hybrida morphology. J. Amer. Soc. Hort. Sci. 116:955–960.
Fisher, R.R. and E.S. Runkle. 2004. Lighting up profits. Meister Media Worldwide. OH. USA.
Kong, F., X. Gao, K.H. Nam, K. Takahashi, H. Matsuura, and T. Yoshihara. 2006. Inhibition of stem elongation in spinach by theobroxide. J. Plant Physiol. 163:557–561.
Olsen, J.E., O. Junttila, and T. Moritz. 1997. Long-day induced bud break in Salix pentandra is associated with transiently elevated levels of GA1 and gradual increase in indole-3-aectic acid. Plant Cell Physiol. 38:536–540.
Roberts, R.H. and B.E. Struckmeyer. 1946. The effect of top environment and flowering upon top-root ratios. Plant Physiol. 21:332–344.
Runkle, E.S., R.D. Heins, A.C. Cameron, and W.H. Carlson. 1998. Flowering of Phlox paniculata is influenced by photoperiod and cold treatment. HortScience 33:1172–1174.
Shamsi, S.R.A. 1976. Effect of a light-break on the growth and development of Epilobium hirsutum and Lythrum salicaria in short photoperiods. Ann. Bot. 40:153–162.
Shamsi, S.R.A. and F.H. Whitehead. 1974. Comparative eco-physiology of Epilobium hirsutum L. and Lythrum salicaria L. J. Ecol. 62: 279–290.
Stevens, K.J., R.L. Peterson, and G.R. Stephenson. 1997. Morphological and anatomical responses of Lythrum salicaria L. (purple loosestrife) to an imposed water gradient. Int. J. Plant Sci. 158: 172–183.
Talon, M. and J.A.D. Zeevaart. 1990. Gibberellins and stem growth as related to photoperiod in Silene armeria L. Plant Physiol. 92: 1094–1100.
Thomas, B. and D. Vince-Prue. 1997. Some general principles, p. 3–28. Photoperiodism in plants. Academic Press, San Diego, CA.
Whitman, C.M., R.D. Heins, A.C. Cameron, and W.H. Carlson. 1996. Cold treatments, photoperiod, and forcing temperature influence flowering of Lavandula angustifolia. HortScience 31:1150–1153.
Zeevaart, J.A.D., D.A. Gage, and M. Talon. 1993. Gibberellin A1 is required for stem elongation in spinach. Proc. Natl. Acad. Sci. 90:7401–7405.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Kim, H.J., Jung, H.H. & Kim, K.S. Influence of photoperiod on growth and flowering of dwarf purple loosestrife. Hortic. Environ. Biotechnol. 52, 1–5 (2011). https://doi.org/10.1007/s13580-011-0058-z
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s13580-011-0058-z