Effects of natural light and light-emitting diode (LED) light on photosynthetic efficiency and other related parameters in rice
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Abstract
The objective of this study was to investigate the effect of natural light and light-emitting diode (LED) on photosynthetic efficiency and chlorophyll contents of five commercial rice varieties. The experiment was laid out in split plot in complete randomized design (split plot in CRD) with 5 replications.The main plot was the growth conditions (natural light (700-950 µmol/m2/s) and LED light (850-1,000 µmol/m2/s), and the sub plot was five rice varieties including Rice Berry (RB), RD10, Chainat1 (CN1), Phitsanulok2 (PSL2), and Hom-Supanburi (HOM-SP). The results showed that plants grown under LED exhibited a greater performance in maximum quantum efficiency of photosystem II (Fv/Fm) with an average of 0.788 in comparison to plant grown under natural light (Fv/Fm=0.72). The greenness of rice leaf grown under LED was higher than under natural light condition with the average of 43.75 and 33.85 SPAD unit, respectively. Chlorophyll a, b, and total chlorophyll contents showed significantly differences among varieties and between the growth conditions. The variation of chlorophyll a and b contents in rice leaves was higher under LED than natural light in HOM-SP, RB, and RD10. The result for the electron transport rate (ETR) showed that there was different between LED and natural grown plants. Plants grown under LED light showed a much higher ETR than natural light plant with the ETR ranging between 2.98 – 186.82 µmol/m2/s and 1.416 – 88.169 µmol/m2/s, respectively. There is variation of traits in response to light source which tends to improve photosynthetic efficiency significantly, as well as the interaction between genetic and environment.
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