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Open AccessArticle

Response of Eustoma Leaf Phenotype and Photosynthetic Performance to LED Light Quality

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The United Graduate School of Agricultural Sciences, Ehime University, 3-5-7 Tarumi, Matsuyama, Ehime 790-8566, Japan
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Department of Plant Resource Production, Kochi University, Monobe B 200, Nankoku, Kochi 783-8502, Japan
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Faculty of Agriculture and Marine Science, Kochi University, Monobe B 200, Nankoku-shi, Kochi 783-8502, Japan
*
Author to whom correspondence should be addressed.
Academic Editor: Douglas D. Archbold
Horticulturae 2017, 3(4), 50; https://doi.org/10.3390/horticulturae3040050
Received: 29 July 2017 / Revised: 2 October 2017 / Accepted: 3 October 2017 / Published: 20 October 2017
In a controlled environment, light from light-emitting diodes (LEDs) has been associated with affecting the leaf characteristics of Eustoma. LEDs help plant growth and development, yet little is known about photosynthetic performance and related anatomical features in the early growth stage of Eustoma leaves. In this study, we examined the effects of blue (B), red (R), and white (W) LEDs on the photosynthetic performance of Eustoma leaves, as well as leaf morphology and anatomy including epidermal layer thickness, palisade cells, and stomatal characteristics. Leaves grown under B LEDs were thicker and had a higher chlorophyll content than those grown under the R and W LEDs. Leaves under B LEDs had greater net photosynthetic rates (A), stomatal conductance (gs), and transpiration rates (E), especially at a higher photon flux density (PPFD), that resulted in a decrease in the intercellular CO2 concentration (Ci), than leaves under the W and R LEDs. B LEDs resulted in greater abaxial epidermal layer thickness and palisade cell length and width than the R and W LED treatments. The palisade cells also developed a more cylindrical shape in response to the B LEDs. B LED leaves also showed greater guard cell length, breadth, and area, and stomatal density, than W or R LEDs, which may contribute to increased A, gs and E at higher PPFDs. View Full-Text
Keywords: adaxial and abaxial epidermal layer; Eustoma grandiflorum; leaf gas exchange; leaf thickness; palisade cell; photosynthetic performance; stomatal characters adaxial and abaxial epidermal layer; Eustoma grandiflorum; leaf gas exchange; leaf thickness; palisade cell; photosynthetic performance; stomatal characters
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Roni, M.Z.K.; Islam, M.S.; Shimasaki, K. Response of Eustoma Leaf Phenotype and Photosynthetic Performance to LED Light Quality. Horticulturae 2017, 3, 50.

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