Effects of Blue Light LED Compositions Under Constant Red Light Proportion to the Growth of the Bentong Ginger (Zingiber Officinale Var. Bentong)

Tey, Chong Poh (2024) Effects of Blue Light LED Compositions Under Constant Red Light Proportion to the Growth of the Bentong Ginger (Zingiber Officinale Var. Bentong). Final Year Project (Bachelor), Tunku Abdul Rahman University of Management and Technology.

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Abstract

In malaysia, Zingiber officinale Var. Bentong is the most popular ginger species which has been consumed due to its unique flavor and pharmaceutical properties. However, due to the increasing demand of the ginger market around the world, the long harvesting period of the ginger will eventually be unable to fulfill the market demand. Therefore, this project is aimed to investigate the effect of blue light compositions on the growth of the bentong ginger to find out a possible parameter for promoting ginger growth. Total 108 ginger buds were grown in the growth chamber. 54 of them were grown under 75% red light combined with 50% blue light while the other 54 were grown under 75% red light with 25% blue light. After three months of the experiment, it was observed that there was no significant difference in the mass of the rhizome. Nevertheless, the growth pattern between ginger plants treated with 50% blue light samples is different compared to 25% blue light treated ginger plants. The 50% blue light treated plants had a moderate growth rate in the first month and started to have substantial growth after day 40 . However, there were few 25% blue light treated plants that had a large margin of increase in height after day 20. Furthermore, the random leaves of the plants were collected from different pots of each blue light condition starting from week 12 to week 13. After 3 days of macerate in 80% acetone, the extractions were analyzed with the UV-VIS spectrophotometer at the wavelength 645 nm and 663 nm. The data observed were calculated and it has been found out that both Chlorophyll A and Chlorophyll B have no significant difference between different treatments of the blue light composition. Additionally, both 50% blue light treatment and 25% blue light treatment chlorophyll content are gradually increasing in 4 weeks on analysis. Besides, on week 12 and week 13, random leaves were collected from each blue light condition pot and they were prepared as slides to observe the stomata density and size. After the observation and statistical analysis, it was concluded that the 25% blue light treated plants have higher stomatal density on both week 12 and week 13 than the 50% blue light treated plants. On the stomata size aspect, 25% blue light treated leaf will have a wider stomata while 50% blue light treated leaf will have longer stomata on week 12. On week 13, 25% blue light treated leaf will have a wider stomata while there is no significant difference in the stomata length. For the DPPH and TFC analysis, there were no results due to the failure to obtain an optimal calibration curve. The TPC of the 50% blue light treated rhizome was higher than 25% blue light treated rhizome and 25% blue light treated leaf and stem has higher TPC than 50% blue light treated leaf and stem.