Effect of light quality on seedling quality characteristics of Petunia hybrida (Behnaz Akbarian)
The use of artificial light has become very common as a means to increase production and quality of seedlings. Light-emitting diodes (LEDs) are a new source of economical and spectrally-selective light. The benefits are: versatility in handling and mounting, long life expectancy, wattage use efficiency and lower heat production. We investigated the effects of light quality from different types of LEDs, namely red, blue, combination of 25% blue and 75% red (blue+red light), and fluorescent lamps, each as a sole light source, on seedling emergence and growth of petunia, zinnia, impatiens and verbena. This study indicated that light quality has different effects on the morphological characteristics of different ornamental crops. Pure red light enhanced the emergence of seedlings. Seedlings grown under the blue+red light were generally of higher quality (compact, larger stem caliper, higher root fresh weight and less morphological disorders). However, petunia seedlings showed the highest quality under blue light, which also promoted floral induction. Shoot height of petunia under red light and blue+red LED treatment was significantly shorter than for other light treatments. Mean root length of petunia seedlings grown under blue light, red light or blue+red light was longer than that for seedlings grown under fluorescent light. This therefore suggests that blue light of lower irradiance appears to be insufficient to induce flowering in petunia and that red light may inhibit flower induction.
Behnaz Akbarian won an ISHS student award for the best poster at the International Symposium on Wild Flowers and Native Ornamental Plants in Iran in May 2017.
Behnaz Akbarian, Department of Horticulture Science, Faculty of Agriculture, University of Tabriz, 29 Bahman Blvd, 51666 Tabriz, Iran, e-mail: email@example.com
The full article is available in Chronica Horticulturae