Effects of LED Light and Vernalization on Growth and Development, and Hormonal Changes in Strawberry cv. Praratchatan 80
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Abstract
Nowadays, plant factory systems under LED lighting are widely used to grow strawberry due to climate changes, which can lead to decreased productivity. This study aimed to investigate the effects of LED lighting and vernalization on growth, development and hormonal changes in the ‘Praratchatan 80’ strawberry. Two experiments were conducted. Experiment 1 examined, the effects of LED lighting on runner production, using a completely randomized designed (CRD) with five treatments, including a natural light control and four LED lighting periods (9, 12, 15 and 18 hours per day). The results indicated that the LED lighting periods had no effect on the days to produce runners and leaf width, but 15 and 18 hours LED lighting periods increased the number of runners, daughter plants, petioles, and chlorophyll content compared to other treatments. Meanwhile, a 9 hours LED lighting period resulted in the highest daughter plant height. Experiment 2 investigated the effects of LED lighting and vernalization on flowering and hormonal changes in the strawberry. The experiment design was factorial in completely randomized design of 3 lighting periods (6, 9 and 12 hours per day) and 2 temperature conditions (non vernalization and vernalization at 4 °C for 2 weeks) compared to natural environment (control). The results showed no interaction between the two factors, and a 9 hour LED lighting period and vernalization led faster flowering and greater number of flowers significantly. These treatments also decrease auxin accumulation in the shoot while promoting cytokinins (zeatin and zeatin riboside) biosynthesis and accumulation, ultimately promoting flower induction and development in the strawberry.
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