Abstract
Phalaenopsis orchid has become one of the most important potted plants in flower markets. However, the timing at which flowers reach the saleable stage can be very important since the demand may be larger for specific holidays. The regulation of stem growth could serve as an opportunity for regulation of flowering. The purpose of this study was to evaluate the effect of temperature on stem elongation. In this study, a stem elongation model established by a statistical technique was used to evaluate the effect of temperature. The stem lengths of four named Phalaenopsi varieties and 15 unnamed Phalaenopsi hybrids were measured under different temperature regimes. The three parameters of the logistic growth model, the maximum stem length, growth rate, and inflection point at which the growth rate reached a maximum value were estimated by using nonlinear regression analysis. Then, the differences among varieties in these three parameters were assessed by categorical testing. The results of this study indicated that stem growth rate was positively affected only by day temperature. The maximum stem length was negatively affected by the day temperature and positively influenced by the temperature difference between day and night. The results of this study could provide a practical method to regulate stem elongation by adjusting the temperatures, thus helping growers time the flowering of their potted orchids to meet market demand.
Highlights
Commercial production of potted orchids has increased significantly since 2004 [1,2]
If day temperature is higher than that of the cultivation temperature value, the leaf is formed in the stem, which is called Keiki’s process [2,13]
The results of this study indicated that stem growth rate was mainly influenced by day temperature, not night temperature or the difference between day and night
Summary
Commercial production of potted orchids has increased significantly since 2004 [1,2]. Phalaenopsis has become the most important orchid in the floral market, due to its long-lasting flowers, diversity of floral color and size, and the ability to schedule its availability on the market. Market demand for Phalaenopsis is not uniform. Market demand increases significantly for certain holidays, such as Valentine’s Day, Mother’s Day, and Easter. In addition to quantity and quality, the time at which orchids in bloom reach the market is very important. In order to help growers produce orchids that are good quality and send them to market on schedule, some production guides have been published by nursery companies [1,2,3]
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