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Horticulturae 2018, 4(4), 36; https://doi.org/10.3390/horticulturae4040036

The Effect of Light Intensity and Temperature on Flowering and Morphology of Potted Red Firespike

1
Coastal Research and Extension Center, Mississippi State University, Poplarville, MS 39470, USA
2
Department of Plant and Soil Sciences, Mississippi State University, Starkville, MS 39759, USA
3
Department of Sustainable Bioproducts, Mississippi State University, Starkville, MS 39759, USA
*
Author to whom correspondence should be addressed.
Received: 26 September 2018 / Revised: 16 October 2018 / Accepted: 20 October 2018 / Published: 25 October 2018
(This article belongs to the Special Issue Light Management for Ornamental Plants)
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Abstract

Red firespike (Odontonema strictum) is a tropical flowering plant that was selected as a potential flowering potted plant for its attractive red floral spikes. The objective of this study was to evaluate how light intensity, photoperiod, and temperature affect the growth and flowering of firespike. In Experiment 1, plants were grown under 0%, 45%, or 65% shade and two photoperiod conditions; long-day (LD = ≥14 h) and short-day (SD = 9 h), for 16 weeks. Plants grown under 45% shade + LD were tallest at 35.9 cm, while plants grown under 65% shade + SD were shortest at 22.8 cm. During the finishing stage, the number of inflorescences increased when plants were grown under 45% shade + SD, 45% shade + LD, and no shade, with 6, 7, and 9 inflorescences, respectively. In addition, the first open flower was observed in the 0% shade group (control) 92 days after starting the experiment. The time to first open flower increased when the plants were grown under 65% shade, either under SD or LD. In Experiment 2, plants were grown in controlled environment growth chambers with average daily temperatures of 15, 25, or 35 °C and an irradiance of 200 µmol·m−2·s−1 for 9 h per day. Plants grown at 25 °C were the tallest and had the largest leaf area. Plants grown at 15 and 35 °C had 28% and 22% less leaf area, respectively. The average number of inflorescences in plants grown at 25 °C was 1.6, while no inflorescence development was observed in plants grown at 15 or 35 °C by the termination of the experiment. There were no differences between plant growth index or branch number in response to temperature. Under the experimental conditions tested, the most rapid and uniform flowering of firespike occurred when plants were grown under no shade or at 25 °C. View Full-Text
Keywords: Odontonema strictum; short-day; photoperiod; irradiance; shade Odontonema strictum; short-day; photoperiod; irradiance; shade
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Rezazadeh, A.; Harkess, R.L.; Telmadarrehei, T. The Effect of Light Intensity and Temperature on Flowering and Morphology of Potted Red Firespike. Horticulturae 2018, 4, 36.

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