Abstract
Veronica rotunda var. subintegra (Nakai) T. Yamaz. (mountain spike speedwell) and V. longifolia L. (long-leaf spike speedwell) are Korean native plants that have potential value as novel ornamental crops due to their unique appearance and flowering time. This study was conducted to examine the effects of cold and photoperiod treatments on the growth and flowering of two Veronica species. Eight-week-old seedlings with four or five nodes grown under a 9-h photoperiod were stored at 5 °C for 0, 3, 6, 9, or 12 weeks and then forced under one of six photoperiod conditions [9, 12, 14, 16, or 24 h of continuous light or 9 h with a 4-h night interruption (NI, 22:00 to 02:00 HR)] in a greenhouse. Regardless of cold treatment, there were no significant differences among photoperiod treatments in any growth parameter (i.e., plant height, numbers of nodes or branches, leaf length or width, shoot or root dry weight) in either species. In plants without cold treatment, V. rotunda var. subintegra showed more than 85.7% flowering regardless of photoperiod, and flowering of V. longifolia was 80.0, 66.7, 70.0, 85.7, 71.4, or 100.0% under photoperiods of 9, 12, 14, 16, or 24 h or NI, respectively. The number of nodes below the first inflorescence, the number of visible inflorescences (VI) at the first open flower, and days to VI were not influenced by photoperiod in either species. As a result, cold treatment was not necessarily required for the flowering of the two Veronica species. Moreover, photoperiod also did not affect the flowering of either species. These results indicate that the two Korean native Veronica species can be classified as day-neutral plants with no vernalization requirement.
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References
Albach DC, Martínez-Ortega MM, Chase MW (2004) Veronica: parallel morphological evolution and phylogeography in the Mediterranean. Plant Syst Evol 246:177–194
Alsharif M, Kim J (2017) Hybrid off-grid SPV/WTG power system for remote cellular base stations towards green and sustainable cellular networks in South Korea. Energies 10:9
Boudry P, Mccombie H, Van Dijk H (2002) Vernalization requirement of wild beet Beta vulgaris ssp. maritima: among population variation and its adaptive significance. J Ecol 90:693–703
Cheon IH, Oh W, Park JH, Kim KS (2006) Long day and high photosynthetic photon flux promote the growth and flowering of Cyclamen persicum. Hortic Environ Biotechnol 47:353–358
Chouard P (1960) Vernalization and its relations to dormancy. Annu Rev Plant Physiol 11:191–238
Enfield A, Heins RD, Runkle ES, Cameron AC (2004) Quick-Cropping Perennials Flowertech 7:28–31
Fausey BA, Cameron AC (2007) Differing vernalization responses of Veronica spicata ‘Red Fox’ and Laurentia axillaris. J Am Soc Hortic Sci 132:751–757
Faust JE, Holcombe V, Rajapakse NC, Layne DR (2005) The effect of daily light integral on bedding plant growth and flowering. HortScience 40:645–649
Heins RD, Cameron AC, Carlson WH, Runkle ES, Whitman CM, Yuan M, Hamaker C, Engle B, Koreman P (1997) Controlled flowering of herbaceous perennial plants. In: Coto E, Kurata K, Hayashi M, Sase S (eds) Plant production in closed ecosystems. Kluwer Academic Publishers, Dordrecht, pp 15–31
Kim HJ, Jung HH, Kim KS (2011) Influence of photoperiod on growth and flowering of dwarf purple loosestrife. Hortic Environ Biotechnol 52:1–5
Mattson NS, Erwin JE (2005) The impact of photoperiod and irradiance on flowering of several herbaceous ornamentals. Sci Hortic 104:275–292
Nau J (2011) Ball Redbook, Ed 18, Vol 2. Ball Publ, West Chicago, pp 720–721
Niu G, Heins RD, Cameron AC, Carlson WH (2000) Day and night temperatures, daily light integral, and CO2 enrichment affect growth and flower development of pansy (Viola × wittrockiana). J Am Soc Hortic Sci 125:436–441
Oh-e I, Saitoh K, Kuroda T (2007) Effects of high temperature on growth, yield and dry-matter production of rice grown in the paddy field. Plant Prod Sci 10:412–422
Padhye SR, Cameron AC (2008) Dianthus gratianopolitanus Vill. ‘Bath’s Pink’ has a near-obligate vernalization requirement. HortScience 43:346–349
Park YJ, Kim YJ, Kim KS (2013) Vegetative growth and flowering of Dianthus, Zinnia, and Pelargonium as affected by night interruption at different timings. Hortic Environ Biotechnol 54:236–242
Runkle ES, Heins RD, Cameron AC, Carlson WH (1998) Flowering of Phlox paniculata is influenced by photoperiod and cold treatment. HortScience 33:1172–1174
Runkle ES, Heins RD, Cameron AC, Carlson WH (1999) Photoperiod and cold treatment regulate flowering of Rudbeckia fulgida ‘Goldsturm.’ HortScience 34:55–58
Sionit N, Strain BR, Flint EP (1987) Interaction of temperature and CO2 enrichment on soybean: Growth and dry matter partitioning. Can J Plant Sci 67:59–67
Song SJ, Shin US, Oh HJ, Kim SY, Lee SY (2019) Seed germination responses and interspecific variations to different incubation temperatures in eight Veronica species native to Korea. Hortic Sci Technol 37:20–31
The Angiosperm Phylogeny Group (2003) An update of the angiosperm of phylogeny group classification for the orders and families of flowering plants: APGII. Bot J Linn Soc 141:399–436
Thomas B, Vince-Prue D (1997) Photoperiodism in plants, Ed 2. Academic Press, San Diego, pp 3–28
Torres AP, Lopez RG (2011) Photoperiod and temperature influence flowering responses and morphology of Tecoma stans. HortScience 46:416–419
Vlahos JC (1990) Temperature and irradiance influence growth and development of three cultivars of Achimenes. HortScience 25:1597–1598
Warner RM, Erwin JE (2001) Variation in floral induction requirements of Hibiscus sp. J Am Soc Hortic Sci 126:262–268
Warner RM, Erwin JE (2003) Effect of photoperiod and daily light integral on flowering of five Hibiscus sp. Sci Hortic 97:341–351
Warner RM, Erwin JE (2005) Prolonged high temperature exposure and daily light integral impact growth and flowering of five herbaceous ornamental species. J Am Soc Hortic Sci 130:319–325
Whitman CM, Heins RD, Cameron AC, Carlson WH (1996) Cold treatments, photoperiod, and forcing temperature influence flowering of Lavandula angustifolia. HortScience 31:1150–1153
Acknowledgements
This study was supported financially by the project ‘Development of Flowering Control for Industrialization of Wild Flowers as New Ornamental Crops’ of the Korea National Arboretum, Project No. KNA-17-C-39.
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SHL: manuscript writing, visualization, all experiments, investigation, data analysis, interpretation; NHI: experiments, investigation, manuscript editing and review; SKA: conceptualization, methodology, manuscript editing and review, project administration; HBL: conceptualization, methodology, manuscript editing and review; KSK: conceptualization, manuscript editing and review, project administration, supervision.
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Communicated by So-Young Park, Ph.D.
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Lim, S.H., Im, N.H., An, S.K. et al. Korean native Veronica rotunda and Veronica longifolia are day-neutral plants with no vernalization requirements. Hortic. Environ. Biotechnol. 62, 859–869 (2021). https://doi.org/10.1007/s13580-021-00367-6
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DOI: https://doi.org/10.1007/s13580-021-00367-6