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- W3113017788 abstract "<h2>Abstract</h2> In order to study the effect of the quality of different LED light spectra (90%R+10%B, 60%R+40%B and control) on photosynthetic parameters (photosynthetic rate (PG), Fv/Fm and ΦPSII) of stomatal conductance, transpiration rate, carbohydrate, starch and chlorophyll index on cress (<i>Lepidium Sativum</i>), a pot experiment was conducted under the greenhouse cultivation-without-soil (hydroponics) condition in the form of split plot based on a completely randomized design with 6 replications. The results showed that the combined application of blue and red light spectra with different percentages had a positive and significant effect on all traits. The highest amounts of each of the photosynthetic parameters in the 60R:40B treatment were 12.4, 0.87, and 0.92 (μmol CO<sub>2</sub> m<sup>−2</sup> s<sup>−1</sup>), respectively, and the lowest amounts (19.6, 0.39, and 0.44 (μmol CO<sub>2</sub> m<sup>−2</sup> s<sup>−1</sup>)) were observed in the control treatment. The highest amounts of stomatal conductance, carbohydrate and starch of leaves which were 0.3 (cm.s<sup>−2</sup>), 5.59 and 6.44 (mg.g-1 FW), respectively, were observed in the 90R: 10B treatment as a result of red light increase. Furthermore, in the control treatment, the light source of which was the natural sunlight, the lowest amounts of 0.11 (cm.s<sup>−2</sup>), 1.98 and 1.09 (mg.g<sup>−1</sup> FW) were observed. The highest transpiration rate (25/83 (mol.m<sup>−2</sup>.s<sup>−1</sup>)) was observed in the 60R: 40B treatment which had experienced a significant increase compared to the control light (sunlight) treatment and the lowest transpiration rate (5.5 (mol.m<sup>−2</sup>.s<sup>−1</sup>)) was in the control (sunlight) treatment. The chlorophyll index in the 60R: 40B treatment was 41.18, which showed a significant difference from the other treatments (p ≤ 0.01) and the lowest amount of 25.5 was detected in the control treatment. As a result, it can be stated that the use of blue and red light spectra in combination with different percentages can have various positive effects on the growth and development of plants; therefore, the existence of both types of spectra is suggested. This technology means that a particular combination of LED light spectra can be useful for a variety of commercial greenhouse products, especially the valuable ones." @default.
- W3113017788 created "2020-12-21" @default.
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- W3113017788 date "2020-12-01" @default.
- W3113017788 modified "2023-10-17" @default.
- W3113017788 title "Investigation of photosynthetic effects, carbohydrate and starch content in cress (Lepidium sativum) under the influence of blue and red spectrum" @default.
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- W3113017788 doi "https://doi.org/10.1016/j.heliyon.2020.e05628" @default.
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